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{{Short description|Adoption of the metric system of measurements in Australia}}
{{Use dmy dates|date=July 2020}} {{Use dmy dates|date=July 2020}}
{{Use Australian English|date=September 2011}} {{Use Australian English|date=September 2011}}
] ]


] in Australia effectively began in 1966 with the conversion to decimal currency under the auspices of the Decimal Currency Board.<ref>{{cite web|url=https://www.youtube.com/watch?v=5ZTeWLA1LAs|title="Dollar Bill" Currency Conversion Advertisement—1966|work=Video|publisher=Commonwealth of Australia—Sound and Film Archive}}</ref> The conversion of measurements—metrication—commenced subsequently in 1971, under the direction of the Metric Conversion Board and actively proceeded until the Board was disbanded in 1981. '''] in Australia''' effectively began in 1966 with the ] under the auspices of the Decimal Currency Board.<ref>{{cite web|url=https://www.youtube.com/watch?v=5ZTeWLA1LAs |archive-url=https://ghostarchive.org/varchive/youtube/20211221/5ZTeWLA1LAs |archive-date=2021-12-21 |url-status=live|title="Dollar Bill" Currency Conversion Advertisement—1966|work=Video|date=15 August 2010 |publisher=Commonwealth of Australia—Sound and Film Archive}}{{cbignore}}</ref> The conversion of measurements—metrication—commenced subsequently in 1971, under the direction of the Metric Conversion Board and actively proceeded until the Board was disbanded in 1981.


Before 1970, Australia mostly used the ] for measurement, which the Australian colonies had inherited from the United Kingdom. Between 1970 and 1988, imperial units were withdrawn from general legal use and replaced with ], facilitated through legislation and government agencies. SI units are now the only legal units of measurement in Australia. Australia's largely successful transition to the metric system parallels that of ] but contrasts with the ] and ]. Before 1970, Australia mostly used imperial units, inherited from the United Kingdom. Between 1970 and 1988, ] were withdrawn from general legal use and replaced with the International System of Units, facilitated through legislation and government agencies. SI units are now the only legal units of measurement in Australia. Australia's largely successful transition to the metric system parallels that of ] but contrasts with ] and ].


==History== ==History==
Although there was debate in Australia's first Parliament after federation to consider adopting the metric system,<ref name="History">{{cite web |url= http://www.measurement.gov.au/measurementsystem/Pages/HistoryofMeasurementinAustralia.aspx|title= History of Measurement in Australia|work= Australia's Measurement System|publisher= National Measurement Institute|accessdate=16 October 2010}}</ref> metric units first became legal for use in Australia in 1947 when Australia signed the ] (or ''Convention du Mètre''). However, Imperial "Weights and Measures" were most commonly used until the Commonwealth government began the metric changeover in the 1970s. In 1960, SI units were adopted as a worldwide system of measurement by international agreement at the ]. The metre, kilogram, ], ], ], ], and ] were defined as base units in this system and units formed from combinations of these base units were known as "derived units". SI units were subsequently adopted as the basis for Australia's measurement standards, whereby they were defined as Australia's legal units of measurement.<ref>{{cite web |url= http://www.measurement.gov.au/measurementsystem/Pages/HowAustraliasMeasurementSystemWorks.aspx|title= How Australia's measurement system works|work= Australia's Measurement System|publisher= National Measurement Institute|accessdate=21 November 2009}}</ref> Although there was debate in Australia's first Parliament after federation to consider adopting the metric system,<ref name="History">{{cite web |url= http://www.measurement.gov.au/measurementsystem/Pages/HistoryofMeasurementinAustralia.aspx|title= History of Measurement in Australia|work= Australia's Measurement System|publisher= National Measurement Institute|accessdate=16 October 2010}}</ref> metric units first became legal for use in Australia in 1947 when Australia signed the ] (or ''Convention du Mètre''). However, Imperial weights and measures were most commonly used until the Commonwealth government began the metric changeover in the 1970s. SI units were subsequently adopted as the basis for Australia's measurement standards, whereby they were defined as Australia's legal units of measurement.<ref>{{cite web |url= http://www.measurement.gov.au/measurementsystem/Pages/HowAustraliasMeasurementSystemWorks.aspx|title= How Australia's measurement system works|work= Australia's Measurement System|publisher= National Measurement Institute|accessdate=21 November 2009}}</ref>


In 1968, a Select Committee of the Australian Senate chaired by ]<ref>{{cite news|url=https://biography.senate.gov.au/laught-keith-alexander/|title=Laught, Keith Alexander (1907–1969))|work=The Biographical Dictionary of the Australian Senate|publisher=UNSW Press|year=2010|volume=3|first=Jenny|last=Tilby Stock}}</ref> examined metric "Weights and Measures" and came to the unanimous conclusion that it was both practical and desirable for Australia to change to the metric system. Some of their considerations included the "inherent advantages of the metric system" that meant that weighing and measuring was facilitated, "often with substantial increases in efficiency". Educationally, the reform would "simplify and unify the teaching of mathematics and science, reduce errors, save teaching time and give a better understanding of basic physical principles". In 1968, more than 75% of Australia's exports went to metric countries, and at that time it was noted that all countries (except the ]) were metric or were converting to the metric system. It was also noted that because of Australia's large migrant programme, more than 10 per cent of people over 16 years of age had used the metric system before coming to Australia. They also noted that school pupils were widely familiar with the metric system because it had been taught in the schools for many years.<ref name="Government of Western Australia">{{cite web|url=http://www.docep.wa.gov.au/consumerprotection/Content/Trade_Measurement/Schools/Introduction_of_the_metric_sys.html |title=Introduction of the metric system in Australia Support for the change |date=4 March 2010 |publisher=Government of Western Australia |accessdate=8 May 2010 |url-status=dead |archiveurl=https://web.archive.org/web/20090704090143/http://www.docep.wa.gov.au/ConsumerProtection/Content/Trade_Measurement/Schools/Introduction_of_the_metric_sys.html |archivedate=4 July 2009 }}</ref> In 1968, a Select Committee of the Australian Senate chaired by ]<ref>{{cite news|url=https://biography.senate.gov.au/laught-keith-alexander/|title=Laught, Keith Alexander (1907–1969))|work=The Biographical Dictionary of the Australian Senate|publisher=UNSW Press|year=2010|volume=3|first=Jenny|last=Tilby Stock}}</ref> examined metric "Weights and Measures" and came to the unanimous conclusion that it was both practical and desirable for Australia to change to the metric system. Some of their considerations included the "inherent advantages of the metric system" that meant that weighing and measuring was facilitated, "often with substantial increases in efficiency". Educationally, the reform would "simplify and unify the teaching of mathematics and science, reduce errors, save teaching time, and give a better understanding of basic physical principles". In 1968, more than 75% of Australia's exports went to metric countries, and at that time it was noted that all countries (except the ]) were metric or were converting to the metric system. It was also noted that because of Australia's large migrant program, more than 10 percent of people over 16 years of age had used the metric system before coming to Australia. They also noted that school pupils were widely familiar with the metric system because it had been taught in the schools for many years.<ref name="Government of Western Australia">{{cite web|url=http://www.docep.wa.gov.au/consumerprotection/Content/Trade_Measurement/Schools/Introduction_of_the_metric_sys.html |title=Introduction of the metric system in Australia Support for the change |date=4 March 2010 |publisher=Government of Western Australia |accessdate=8 May 2010 |url-status=dead |archiveurl=https://web.archive.org/web/20090704090143/http://www.docep.wa.gov.au/ConsumerProtection/Content/Trade_Measurement/Schools/Introduction_of_the_metric_sys.html |archivedate=4 July 2009 }}</ref>


By 1968, metrication was already well under way in Australian industry. The pharmaceutical industry had metricated in 1965, and much of the chemical and electronics industries worked in metric units, as there were no "Imperial" units for the latter. One of the country's major automobile manufacturers had already declared its intention to metricate before the Government announced its decision to change to the metric system. "The change itself provided a unique opportunity to rationalise and modernise industrial practices and bring Australia's technical standard specifications into accord with those adopted internationally".<ref name="Government of Western Australia"/> By 1968, metrication was already well underway in Australian industry. The pharmaceutical industry had metricated in 1965, and much of the chemical and electronics industries worked in metric units, as there were no imperial units for the latter. One of the country's major automobile manufacturers had already declared its intention to metricate before the Government announced its decision to change to the metric system. "The change itself provided a unique opportunity to rationalise and modernise industrial practices and bring Australia's technical standard specifications into accord with those adopted internationally".<ref name="Government of Western Australia"/>


On 12 June 1970, the Australian Metric Conversion Act passed by the ] was given assent. This Act created the Metric Conversion Board to facilitate the conversion of measurements from imperial to metric. A timeline of major developments in this conversion process is as follows:<ref name="History"/> On 12 June 1970, the ''Australian Metric Conversion Act'' passed by the ] was given assent. This Act created the Metric Conversion Board to facilitate the conversion of measurements from imperial to metric. A timeline of major developments in this conversion process is as follows:<ref name="History"/>


*1971 – the Australian ] industry converted to the metric system. *1971 – The Australian ] industry converted to the metric system.
*1972 – Horse racing converted in August and air temperatures were converted in September.<ref>{{cite web|url=http://www.waclimate.net/round/australia-acorn.html|title=Australia ACORN-SAT temperature fraction audit|author=<!--Staff writer(s); no by-line.-->|date=December 2009|work=web page|publisher=WA climate net|accessdate=4 December 2012}}</ref> *1972 – Horse racing converted in August and air temperatures were converted in September.<ref>{{cite web|url=http://www.waclimate.net/round/australia-acorn.html|title=Australia ACORN-SAT temperature fraction audit|author=<!--Staff writer(s); no by-line.-->|date=December 2009|work=web page|publisher=WA climate net|accessdate=4 December 2012}}</ref>
*1973 – all primary schools were teaching the metric system alone: many had been teaching both imperial and metric for some years. All secondary schools were now using the metric system. *1973 – All primary schools were teaching the metric system alone: many had been teaching both imperial and metric for some years. All secondary schools were now using the metric system.
*1974 – large scale conversion across industries, including packaged ]s, ] products, ], ], ], ], ], ], ], ]s, ], ], ], ], ], ], ], ], ], ], ], ], and ]. Most ]s, aside from spirits, also converted to metric units by the end of the year. The conversion of road signs took place in July. There was a publicity campaign to prepare the public.<ref> YouTube.</ref> *1974 – Large scale conversion across industries, including packaged ]s, ] products, ], ], ], ], ], ], ], ]s, ], ], ], ], ], ], ], ], ], ], ], ], and ]. Most ]s, aside from spirits, also converted to metric units by the end of the year. The conversion of road signs took place in July, aided by a publicity campaign to prepare the public.<ref> YouTube.</ref>
*1976 – the building and construction industry completed its change to metric measurements (within two years) by January. *1976 – The building and construction industry completed its change to metric measurements (within two years) by January.
*1977 – all packaged goods were labelled in metric units, and the ], ], ], ], ], ], and appliance ] industries converted to metric. *1977 – All packaged goods were labelled in metric units, and the ], ], ], ], ], ], and appliance ] industries converted to metric.
*1987 – the property industry, the last major industry holdout, converted to metric. *1987 – The property industry, the last major industry holdout, converted to metric.
*1988 – with Western Australia finally making the change, metrication was completed, and the metric system became the only system of legal measurements in Australia. *1988 – With Western Australia fully implementing the change, metrication was completed nationwide and the metric system became the only system of legal measurements in Australia.


===Metric Conversion Board=== ===Metric Conversion Board===
Opposition to metrication was not widespread.<ref name="USMA"/> The Metric Conversion Board did not proceed with education programmes as polling revealed that most people were learning units and their application independently of each other, rendering efforts to teach the systematic nature of the metric system unnecessary and possibly increasing the amount of opposition.<ref name="USMA"/> The Board was dissolved in 1981, but the conversion to the metric system was not completed until 1988. The Board spent A$5.955 million during its 11 years of operation, and the federal government distributed $10 million to the states to support their conversion process. Between 1984 and 1988, the conversion was the responsibility of the National Standards Commission, later renamed the ] in 1988. The cost of metrication for the private sector was not determined but the Prices Justification Tribunal reported that metrication was not used to justify price increases.<ref name="USMA">{{cite web|url=http://www.us-metric.org/metrication-in-other-countries/|title= Metrication of Australia|date=1996–2009|work=Metric usage and metrication in other countries|publisher= U.S. Metric Association|accessdate=26 November 2009}}</ref> Opposition to metrication was not widespread.<ref name="USMA"/> The Metric Conversion Board did not proceed with education programs as polling revealed that most people were learning units and their applications independently of each other, rendering efforts to teach the systematic nature of the metric system unnecessary and possibly increasing the amount of opposition.<ref name="USMA"/> The Board was dissolved in 1981, but the conversion to the metric system was not completed until 1988. The Board spent A$5.955 million during its 11 years of operation, and the federal government distributed $10 million to the states to support their conversion process. Between 1984 and 1988, the conversion was the responsibility of the National Standards Commission, later renamed the ] in 1988. The cost of metrication for the private sector was not determined but the Prices Justification Tribunal reported that metrication was not used to justify price increases.<ref name="USMA">{{cite web|url=http://www.us-metric.org/metrication-in-other-countries/|title= Metrication of Australia|date=1996–2009|work=Metric usage and metrication in other countries|publisher= U.S. Metric Association|accessdate=26 November 2009}}</ref>


===Metrication of horse racing=== ===Metrication of horse racing===
An early change was the metrication of horse racing. This was facilitated because the ] (one eighth of a mile) is close to 200 m. Therefore, the ] was changed from 2 mi to 3 200 m, a reduction of 19 m or about 0.6%. The first metric Melbourne Cup was raced in November 1972.<ref>{{cite web|url=http://www.aussiepunter.com/thoroughbred/melbourne-cup/history|archive-url=https://web.archive.org/web/20100603225436/http://www.aussiepunter.com/thoroughbred/melbourne-cup/history|url-status=dead|archive-date=3 June 2010|title=Melbourne Cup History|publisher=Aussie Punter|accessdate=2 August 2011}}</ref> ]
An early change was the metrication of ]. This was facilitated because the ] (one-eighth of a mile) is close to 200 m. Therefore, the ] was changed from 2&nbsp;mi to 3,200 m, a reduction of 19 m or about 0.6%. The first metric Melbourne Cup was raced in November 1972.<ref>{{cite web|url=http://www.aussiepunter.com/thoroughbred/melbourne-cup/history|archive-url=https://web.archive.org/web/20100603225436/http://www.aussiepunter.com/thoroughbred/melbourne-cup/history|url-status=dead|archive-date=3 June 2010|title=Melbourne Cup History|publisher=Aussie Punter|accessdate=2 August 2011}}</ref>


===Metrication of weather reporting and forecasts=== ===Metrication of weather reporting and forecasts===
When the Australian ] was enlisted to introduce the metric system for weather reporting and forecasts, its public relations officer, Godfrey Wiseman, coined a series of jingles to educate the public, using the terms "frosty fives", "tingling tens", "temperate twenties", "thirsty thirties" and "fiery forties" to describe human sensation to temperatures in degrees Celsius. This was very successful because the public soon became aware of the significance of the descriptions. When the Australian ] was enlisted to introduce the metric system for weather reporting and forecasts, its public relations officer, Godfrey Wiseman, coined a series of ]s to educate the public, using the terms ''frosty fives'', ''tingling tens'', ''temperate twenties'', ''thirsty thirties'' and ''fiery forties'' to describe human sensation to temperatures in degrees Celsius. This was very successful because the public soon became aware of the significance of the descriptions.


At the culmination of this campaign, weather reports and forecasts in both ] and ] were provided for one month only. After that, from 1 September 1972, only Celsius measurements were given for temperature.<ref>https://ukmetric.files.wordpress.com/2019/09/19720901-temperature-and-pressure-go-metric.pdf</ref><ref>http://navigatesenatecommittees.senate.gov.au/events/select-committee-on-the-metric-system-of-weights-and-measures/12</ref> At the culmination of this campaign, weather reports and forecasts in both ] and ] were provided for one month only. After that, from 1 September 1972, only Celsius measurements were given for temperature.<ref>1 September 1972. . Bureau of Meteorology. Retrieved on 12 October 2023.</ref><ref>{{cite web | url=http://navigatesenatecommittees.senate.gov.au/events/select-committee-on-the-metric-system-of-weights-and-measures/12 | title=Select Committee on the Metric System of Weights and Measures / Senate Committees }}</ref>


Similarly, wind speed was reported only in kilometres per hour (km/h) from 1 April 1973 and rainfall was reported in millimetres - with river depths, snow depths and waves reported in metres - from 1 January 1974.<ref>{{cite web|title=Wording and Verification of Forecasts|url=http://www.austehc.unimelb.edu.au/fam/1034.html|website=Federation and Meteorology|publisher=Australian Science and Technology Heritage Centre|accessdate=2015-07-30}}</ref> Similarly, ] was reported only in kilometres per hour (km/h) from 1 April 1973 and rainfall was reported in ]s{{spnd}} with river depths, snow depths and waves reported in metres{{spnd}} from 1 January 1974.<ref>{{cite web|title=Wording and Verification of Forecasts|url=http://www.austehc.unimelb.edu.au/fam/1034.html|website=Federation and Meteorology|publisher=Australian Science and Technology Heritage Centre|accessdate=2015-07-30}}</ref>


===Metrication of the road signs=== ===Metrication of the road signs===
]
An important and very visible sign of metric conversion in Australia was the change in road signs and the accompanying traffic regulations; "M-day" for this change was 1 July 1974. Because of careful planning, almost every road sign in Australia was converted within a month. This was achieved by installing covered metric signs alongside the imperial signs before the change and then removing the imperial sign and uncovering the metric sign during the month of conversion. An important and very visible sign of metric conversion in Australia was the change in ]s and the accompanying traffic regulations; "M-day" for this change was 1 July 1974. Because of careful planning, almost every road sign in Australia was converted within a month. This was achieved by installing covered metric signs alongside the imperial signs before the change and then removing the imperial sign and uncovering the metric sign during the month of conversion.


While road signs could not all be changed at the same time, there was little chance of confusion as to what any speed limit sign meant during this short change-over period. This was because the previous mph signs had the signage in black on white and were rectangular, in the same style as current US speed limit signs, whilst the km/h signs which replaced them had the number indicating the speed limit inside a red circle, as is done in Europe.<ref>{{cite web|url=https://www.youtube.com/watch?v=KoEgJzNf8b4|title=Road Metric Conversion Advertisement—1974 |work=Video|publisher= Commonwealth of Australia—Sound and Film Archive}}</ref> While road signs could not all be changed at the same time, there was little chance of confusion as to what any ] sign meant during this short change-over period. This was because the previous mph signs had the signage in black on white and were rectangular, in the same style as current US speed limit signs, whilst the km/h signs which replaced them had the number indicating the speed limit inside a red circle, as is done in Europe.<ref>{{cite web|url=https://www.youtube.com/watch?v=KoEgJzNf8b4|title=Road Metric Conversion Advertisement—1974 |work=Video|date=21 October 2008 |publisher= Commonwealth of Australia—Sound and Film Archive}}</ref>


Road distance signs were also converted during this period. To avoid confusion as to whether the distance indicated was in miles or kilometres new '''major''' distance signs had affixed to them a temporary yellow plate showing the symbol '''km'''.<ref name="Motoring Goes Metric"/> On the many new kilometre signs on minor roads, a yellow plate which showed the corresponding number of miles was affixed under the now permanent kilometre distance indication. These temporary plates were removed after about one year. Road distance signs were also converted during this period. To avoid confusion as to whether the distance indicated was in miles or kilometres new '''major''' distance signs had affixed to them a temporary yellow plate showing the symbol '''km'''.<ref name="Motoring Goes Metric"/> On the many new kilometre signs on minor roads, a yellow plate which showed the corresponding number of miles was affixed under the now permanent kilometre distance indication. These temporary plates were removed after about one year.


Except for bridge-clearance and flood-depth signs, dual marking was avoided. Though people opposed to metrication expressed concern that ignorance of the meaning of metric speeds would lead to slaughter on the roads, this did not happen, as most drivers under the age of 25 had been taught metric units at school and through them, their parents were familiar with metric speeds, if not metric units as a whole. Except for bridge clearance and flood-depth signs, dual marking was avoided. Though people opposed to metrication expressed concern that ignorance of the meaning of metric speeds would lead to accidents on the roads, this did not happen, as most drivers under the age of 25 had been taught metric units at school, and through them, their parents were familiar with metric speeds, if not metric units as a whole.


It was believed that public education would be the most effective way of ensuring public safety. A Panel for Publicity on Road Travel, made up of the various motoring organisations, regulatory authorities and the media, planned a campaign to publicise the change. The resulting publicity campaign cost $200,000 and the Australian Government Department of Transport paid for it. The Board also produced 2.5 million copies of a pamphlet, "Motoring Goes Metric".<ref name="Motoring Goes Metric">{{cite web|url=https://ukmetric.files.wordpress.com/2019/09/19740701-motoring-goes-metric.pdf|title=Motoring Goes Metric|year=1974|work=Pamphlet|publisher= Metric Conversion Board.}}</ref> This was distributed through post offices, police stations and motor registry offices. It was believed that public education would be the most effective way of ensuring public safety. A Panel for Publicity on Road Travel made up of the various motoring organisations, regulatory authorities, and the media, planned a campaign to publicise the change. The resulting publicity campaign cost $200,000 and the Australian Government Department of Transport paid for it. The Board also produced 2.5 million copies of a pamphlet, "Motoring Goes Metric".<ref name="Motoring Goes Metric">{{cite web|url=https://ukmetric.files.wordpress.com/2019/09/19740701-motoring-goes-metric.pdf|title=Motoring Goes Metric|year=1974|work=Pamphlet|publisher= Metric Conversion Board.}}</ref> This was distributed through post offices, police stations, and motor registry offices.


"For about a year before the change, motor car manufacturers fitted dual speedometers to their vehicles and, after 1974, all new cars were fitted with metric-only speedometers. Several kinds of speedometer conversion kits were available. "For about a year before the change, motor car manufacturers fitted dual speedometers to their vehicles and, after 1974, all new cars were fitted with metric-only ]s. Several kinds of speedometer conversion kits were available.


"As a result of all these changes, conversion on the roads occurred without incident."<ref>{{cite web|url=http://www.mail-archive.com/usma@colostate.edu/msg04320.html|title=Metrication in Australia|author=Kevin Wilkes|year=1992|work=Book|publisher=Commonwealth of Australia|postscript=A quotation from the book appears at the link provided|accessdate=17 February 2011}}</ref><ref name="Wilkes">{{cite web|url=http://themetricmaven.com/wp-content/uploads/2012/03/Metrication-in-Australia-built-2013-06-24.pdf|title=Metrication in Australia|author=Kevin Wilkes|year=1992|work=Book|publisher=Commonwealth of Australia|postscript=Entire document.}}</ref> "As a result of all these changes, conversion on the roads occurred without incident."<ref>{{cite web|url=http://www.mail-archive.com/usma@colostate.edu/msg04320.html|title=Metrication in Australia|author=Kevin Wilkes|year=1992|work=Book|publisher=Commonwealth of Australia|postscript=A quotation from the book appears at the link provided|accessdate=17 February 2011}}</ref><ref name="Wilkes">{{cite web|url=http://themetricmaven.com/wp-content/uploads/2012/03/Metrication-in-Australia-built-2013-06-24.pdf|title=Metrication in Australia|author=Kevin Wilkes|year=1992|work=Book|publisher=Commonwealth of Australia|postscript=Entire document.}}</ref>


===Building and construction=== ===Building and construction===
] showing millimetres]]
The building industry was the first major industry grouping in Australia to complete its change to metric. This was achieved within two years by January 1976 for all new buildings other than those for which design had commenced well before metrication began.<ref>https://themetricmaven.com/wp-content/uploads/2012/03/Metrication-in-Australia-built-2013-06-24.pdf Section 9.2 Page 34</ref> The resulting savings for builders and their sub-contractors has been estimated at 10% a year of gross turnover.<ref>http://www.metricationmatters.com/docs/CostOfNonMetrication.pdf Sub Answer 3. 1</ref> The building industry was the first major industry grouping in Australia to complete its change to metric. This was achieved within two years by January 1976 for all new buildings other than those for which design had commenced well before metrication began.<ref>. Section 9.2 Page 34. Department of Industry Technology and Commerce. Retrieved on 12 October 2023.</ref> The resulting savings for builders and their sub-contractors has been estimated at 10% of gross turnover.<ref>http://www.metricationmatters.com/docs/CostOfNonMetrication.pdf Sub Answer 3. 1.</ref>


In this the industry was grateful to the SAA (now ]) for the early production of the Standard AS 1155-1974 "Metric Units for Use in the Construction Industry", which specified the use of millimetres as the small unit for the metrication upgrade. In this, the industry was grateful to Standards Australia for the early production of the Standard AS 1155-1974 "Metric Units for Use in the Construction Industry", which specified the use of millimetres as the small unit for the metrication upgrade. In the adoption of the millimetre as the "small" unit of length for metrication (instead of the centimetre) the Metric Conversion Board leaned heavily on experience in the United Kingdom and within the International Organisation for Standardisation, where this decision had already been taken.<ref name="Wilkes"/><ref>]</ref>{{Circular reference|date=May 2019}}
In the adoption of the millimetre as the "small" unit of length for metrication (instead of the centimetre) the Metric Conversion Board leaned heavily on experience in the ] and within the ], where this decision had already been taken.<ref name="Wilkes"/><ref>]</ref>{{Circular reference|date=May 2019}}


This was formally stated as follows: This was formally stated as follows:
"The metric units for linear measurement in building and construction will be the metre (m) and the millimetre (mm), with the kilometre (km) being used where required. This will apply to all sectors of the industry, and the centimetre (cm) shall not be used. … the centimetre should not be used in any calculation and it should never be written down".<ref>(Standards Association of Australia "Metric Handbook, Metric Conversion in Building and Construction" 1972)</ref> "The metric units for linear measurement in building and construction will be the metre (m) and the millimetre (mm), with the kilometre (km) being used where required. This will apply to all sectors of the industry, and the ] (cm) shall not be used. … the centimetre should not be used in any calculation and it should never be written down".<ref>Standards Association of Australia "Metric Handbook, Metric Conversion in Building and Construction" 1972</ref>


The logic of using the millimetre in this context was that the metric system had been so designed that there would exist a multiple or submultiple for every use. Decimal fractions would not have to be used. Since the tolerances on building components and building practice would rarely be less than one millimetre, the millimetre became the sub-unit most appropriate to this industry. The logic of using the millimetre in this context was that the metric system had been so designed that there would exist a multiple or submultiple for every use. Decimal fractions would not have to be used. Since the tolerances on building components and building practice would rarely be less than one millimetre, the millimetre became the sub-unit most appropriate to this industry.


] converted from imperial measurements such as 1/044, 1/064, 3/036, 7/029 or 7/036 to metric 1.5mm², 2.5mm² or 4.0mm² wire sizes.<ref>{{cite web | url=https://forums.whirlpool.net.au/archive/2732370 | title=What size CB for regular power circuit? 16 or 20? - Kitchen appliances }}</ref>
Although for the most part they are ignored in everyday life, it was not possible for education in the logical construction of the metric system to ignore the metric prefixes deci, centi, hecto and deka, since the derivation of the litre is dependent upon the knowledge that it derives from the volume of a cubic decimetre, i.e. 1000 cubic centimetres.

However, in Australia, the prefix "centi" has been limited to use with the metre, mainly by the general public not associated with the building industry, unlike in Europe, where the centilitre may often be encountered.


==Extent== ==Extent==
Metrication is complete, with some exceptions:
⚫ Metrication is mostly complete. Road signs solely use metric measurements, as do the speedometers and odometers in motor vehicles produced after 1974, but there was no requirement for pre-1974 vehicles to have their speedometers and odometers converted to metric, so vintage cars display miles and miles per hour, and privately imported vehicles, such as classic cars, do not need to be so converted. The sale of oil and petrol is sold in litres, but tyre pressure is commonly referred to in pounds per square inch alongside kilopascals.<ref>{{cite web|url=http://www.racq.com.au/__data/assets/pdf_file/0008/58724/05_Tyre_Gauge_Survey.pdf|title=Archived copy|accessdate=2013-02-17|url-status=dead|archiveurl=https://web.archive.org/web/20110312085743/http://www.racq.com.au/__data/assets/pdf_file/0008/58724/05_Tyre_Gauge_Survey.pdf|archivedate=12 March 2011}}</ref><ref>{{cite web|url=http://www.metzeler.com.au/shop/category/tyre-pressures|title=Archived copy|accessdate=2013-02-17|url-status=dead|archiveurl=https://web.archive.org/web/20130302025221/http://www.metzeler.com.au/shop/category/tyre-pressures|archivedate=2 March 2013}}</ref>


*Road signs solely use metric measurements, as do the speedometers and ]s in motor vehicles produced after 1974. However, there was no requirement for pre-1974 vehicles to have their speedometers and odometers converted to metric, so vintage cars display miles and miles per hour, and privately imported vehicles, such as classic cars, are not required to be converted.
⚫ Fruit and vegetables are advertised, sold and weighed in grams, groceries are packed and labelled in metric units. Schooling is wholly metric. Newspaper reports are mostly in metric terms. In some cases, old imperial standards were replaced with rounded metric values, as with horse racing or the size of ] (rounded to the nearest 5 cm<sup>3</sup>). The pre-metric names of beer glass sizes, including the pint, have been retained (although in South Australia the "pint" of beer is not an imperial pint, as it is elsewhere in Australia).<ref>ABC News, 'Getting to the bottom of the pint: the bitter problem of Adelaide's beer glasses', 8 September 2017, https://www.abc.net.au/news/2017-09-08/curious-adelaide-south-australia-beer-glass-sizes/8874960, accessed 20 May 2019</ref> Dressed timber is often sold in lengths such as 1.8, 2.4, 3.0, and 3.6 metres, each multiples of 300 mm, approximating foot length increments,<ref>http://www.bunnings.com.au/our-range/building-hardware/timber/dressed-timber</ref> while pipes and conduits may be specified as having diameters of 12, 19, 25, and 32 mm (based on "soft" conversions of 0.5, 0.75, 1 and 1.25 in).


⚫ *Oil and petrol is sold in litres. Vehicle tyres (as in the rest of the world) mark the rim diameter in inches and the width in millimetres, such that a tyre marked '165/70R13' has a width of 165&nbsp;mm, an aspect ratio (profile) of 70% and a 13-inch rim diameter. Tyre pressures may be given in either kilopascals (kPa) or pounds per square inch (PSI).<ref>{{cite web|url=http://www.bridgestone.com.au/tyres/passenger/care/pressure.aspx|title=Bridgestone Tyre pressure tips|year=2007|work=web page|publisher=Bridgestone Australia Corporate|accessdate=4 June 2011}}</ref><ref>{{cite web|url=http://www.racq.com.au/__data/assets/pdf_file/0008/58724/05_Tyre_Gauge_Survey.pdf|title=Archived copy|accessdate=2013-02-17|url-status=dead|archiveurl=https://web.archive.org/web/20110312085743/http://www.racq.com.au/__data/assets/pdf_file/0008/58724/05_Tyre_Gauge_Survey.pdf|archivedate=12 March 2011}}</ref><ref>{{cite web|url=http://www.metzeler.com.au/shop/category/tyre-pressures|title=Metzeler AU - Tyre Pressures|accessdate=2013-02-17|url-status=dead|archiveurl=https://web.archive.org/web/20130302025221/http://www.metzeler.com.au/shop/category/tyre-pressures|archivedate=2 March 2013}}</ref>
⚫ In some cases, goods manufactured to pre-metric standards are available, such as some bolts, nuts, screws<ref>{{cite web|author=admin, on 27 August 2009|url=http://www.scrooz.com.au/blog/what-screw-size-and-thread-measurements-do-we-use/|title=what screw size and thread measurement do we use for hardware? &#124; the scrooz blog|publisher=Scrooz.com.au|date=27 August 2009|accessdate=2 August 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110822070427/http://www.scrooz.com.au/blog/what-screw-size-and-thread-measurements-do-we-use/|archivedate=22 August 2011}}</ref><ref>{{cite web|url=http://www.bolts.com.au/|title=Nuts and Bolts - Industrial Size Assortment Packs of Hi-Tensile Nuts & Bolts|publisher=Bolts.com.au|accessdate=2 August 2011}}</ref> and pipe threads<ref>{{cite web|url=http://www.prittie.com.au/pttspsring.htm|title=Pipe Thread, Tapered Screw Plug and Screw Ring Gauges|publisher=Prittie.com.au|accessdate=2 August 2011}}</ref> and there are some instances where imperial units may still be used:

*Fruit and vegetables are advertised, sold, and weighed in grams, and groceries are packed and labelled in metric units. Schooling is wholly metric. Newspaper reports are nearly always in metric.

⚫ *In some cases, old imperial standards were replaced with rounded metric values, as with horse racing or the size of ] (rounded to the nearest 5&nbsp;cm<sup>3</sup>). The pre-metric names of beer glass sizes, including the ], have been retained (although in South Australia the "pint" of beer is not an imperial pint, as it is elsewhere in Australia).<ref>{{Cite news |date=2017-09-07 |title=Why is Adelaide's pint glass different to the rest of Australia? |language=en-AU |work=ABC News |url=https://www.abc.net.au/news/2017-09-08/curious-adelaide-south-australia-beer-glass-sizes/8874960 |access-date=2023-10-12}}</ref>

*Dressed timber is often sold in lengths such as 1.8, 2.4, 3.0, and 3.6 metres, each multiples of 300&nbsp;mm, approximating foot-length increments,<ref>. Bunnings. Retrieved on 12 October 2023.</ref> while pipes and conduits may be specified as having diameters of 12, 19, 25, and 32&nbsp;mm (based on "soft" conversions of 0.5, 0.75, 1, and 1.25 inches).

⚫ *In some cases, goods manufactured to pre-metric standards are available, such as some bolts, nuts, screws,<ref>{{cite web|author=admin, on 27 August 2009|url=http://www.scrooz.com.au/blog/what-screw-size-and-thread-measurements-do-we-use/|title=what screw size and thread measurement do we use for hardware? &#124; the scrooz blog|publisher=Scrooz.com.au|date=27 August 2009|accessdate=2 August 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110822070427/http://www.scrooz.com.au/blog/what-screw-size-and-thread-measurements-do-we-use/|archivedate=22 August 2011}}</ref><ref>{{cite web|url=http://www.bolts.com.au/|title=Nuts and Bolts - Industrial Size Assortment Packs of Hi-Tensile Nuts & Bolts|publisher=Bolts.com.au|accessdate=2 August 2011}}</ref> and pipe threads.<ref>{{cite web|url=http://www.prittie.com.au/pttspsring.htm|title=Pipe Thread, Tapered Screw Plug and Screw Ring Gauges|publisher=Prittie.com.au|accessdate=2 August 2011}}</ref>
*Mass is referred to in grams,<ref name="ABS height & weight"/><ref>http://www.jennycraig.com.au/pressrelease.aspx?id=1655</ref> and baby nappy sizes are specified in grams only.<ref>{{cite web|url=http://www.huggies.com.au/nappies/huggies-nappies/nappy-range|title=Nappies product range - Find advice on baby products at|publisher=Huggies.com.au|accessdate=2 August 2011}}</ref><ref>{{cite web|url=http://www.snugglers.com.au/products.html|archive-url=https://web.archive.org/web/20070829214435/http://www.snugglers.com.au/products.html|url-status=dead|archive-date=29 August 2007|title=Snugglers® Australia - Our Products|publisher=Snugglers.com.au|accessdate=2 August 2011}}</ref> While some parents convert their baby's hospital-stated birth mass to pounds and ounces, the practice has become far less common.<ref></ref><ref>{{cite news|url=https://www.mamamia.com.au/gestational-diabetes/|title=I was 34 weeks pregnant when I was told I had gestational diabetes. Here's how I managed.|date=2018-11-05|work=Mamamia|access-date=2018-11-14|language=en-US}}</ref> *Body weight is referred to in kilograms,<ref name="ABS height & weight"/><ref>{{cite web |url=http://www.jennycraig.com.au/pressrelease.aspx?id=1655 |title=Jenny Craig : New look Magda Szubanski sheds kilos on Jenny Craig |website=www.jennycraig.com.au |url-status=dead |archive-url=https://web.archive.org/web/20090914180314/http://www.jennycraig.com.au/pressrelease.aspx?id=1655 |archive-date=2009-09-14}}</ref> and baby nappy sizes are specified in grams only.<ref>{{cite web|url=http://www.huggies.com.au/nappies/huggies-nappies/nappy-range|title=Nappies product range - Find advice on baby products at|publisher=Huggies.com.au|accessdate=2 August 2011}}</ref><ref>{{cite web|url=http://www.snugglers.com.au/products.html|archive-url=https://web.archive.org/web/20070829214435/http://www.snugglers.com.au/products.html|url-status=dead|archive-date=29 August 2007|title=Snugglers® Australia - Our Products|publisher=Snugglers.com.au|accessdate=2 August 2011}}</ref> A few parents still convert their baby's hospital-stated birth mass to pounds and ounces.<ref></ref><ref>{{cite news|url=https://www.mamamia.com.au/gestational-diabetes/|title=I was 34 weeks pregnant when I was told I had gestational diabetes. Here's how I managed.|date=2018-11-05|work=Mamamia|access-date=2018-11-14|language=en-US}}</ref>

*Human height is measured in centimetres.<ref name="ABS height & weight">{{cite web|title=Profiles of Health, Australia, 2011-13|url=http://www.abs.gov.au/ausstats/abs@.nsf/Lookup/4338.0main+features212011-13|website=abs.gov.au|publisher=]|accessdate=15 October 2014}}</ref><ref>{{cite book|author1=Beth Price|author2=David Tynan|author3=Natalie Caruso|author4=Allason McNamara|author5=Gloria Stillman|author6=Jill Brown|title=MathsWorld Year 8 VELS Edition|date=2009|publisher=]|location=Australia|page=626|url=https://books.google.com/books?id=t2veDRPjMggC&printsec=frontcover#v=onepage&q&f=true|accessdate=5 July 2014}}</ref> In informal contexts, a person's height is still often stated in feet and inches.<ref>{{cite web|url=http://www.ksrc-au.com/phpBB3/viewtopic.php?f=29&t=12143|title=Kawasaki Sportsbike Riders Club - Australia - Online Forum • View topic - ZZR 600 Seat Height Question|publisher=Ksrc-au.com|accessdate=2 August 2011}}</ref><ref>At least one uses metric units for height with the imperial measurement alongside.</ref> *Human height is measured in centimetres.<ref name="ABS height & weight">{{cite web|title=Profiles of Health, Australia, 2011-13|url=http://www.abs.gov.au/ausstats/abs@.nsf/Lookup/4338.0main+features212011-13|website=abs.gov.au|date=29 October 2012 |publisher=]|accessdate=15 October 2014}}</ref><ref>{{cite book|author1=Beth Price|author2=David Tynan|author3=Natalie Caruso|author4=Allason McNamara|author5=Gloria Stillman|author6=Jill Brown|title=MathsWorld Year 8 VELS Edition|date=2009|publisher=]|location=Australia|page=626|isbn=9780732992514|url=https://books.google.com/books?id=t2veDRPjMggC|accessdate=5 July 2014}}</ref> In informal contexts, a person's height may be stated in feet and inches.<ref>{{cite web|url=http://www.ksrc-au.com/phpBB3/viewtopic.php?f=29&t=12143|title=Kawasaki Sportsbike Riders Club - Australia - Online Forum • View topic - ZZR 600 Seat Height Question|publisher=Ksrc-au.com|accessdate=2 August 2011}}</ref><ref>At least one uses metric units for height with the imperial measurement alongside.</ref>
⚫ *Domestic and commercial property is advertised in square metres or hectares. Although crop yields are described in tonnes per hectare,<ref>{{cite web|url=http://www.abc.net.au/news/stories/2010/11/17/3068718.htm|title=High hopes for big crop yields - ABC News (Australian Broadcasting Corporation)|publisher=Abc.net.au|date=17 November 2010|accessdate=2 August 2011}}</ref> rural land area is sometimes advertised in acres.<ref>{{cite news|url=https://www.standard.net.au/story/5748492/yangery-lifestyle-property-sells-for-9600-an-acre/|title=Yangery lifestyle property sells for $9600 an acre|last=Himmelreich|first=Everard|date=2018-11-08|work=The Standard|access-date=2018-11-14|language=en}}</ref><ref>{{cite web|url=http://www.aussiefarmsforsale.com/nsw.htm|title=NSW|publisher=Aussiefarmsforsale.com|accessdate=2 August 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110812181759/http://www.aussiefarmsforsale.com/nsw.htm|archivedate=12 August 2011}}</ref>

⚫ *Weather reports are measured in metric<ref>{{cite news|url=http://weather.smh.com.au/local.jsp|work=The Sydney Morning Herald|title=Sydney Weather}}</ref> but some specialised surf reports give wave heights in feet.<ref>{{cite news|url=http://www.smh.com.au/environment/australian-monster-wave-heralds-huge-surf-for-sydney-20100917-15f23.html|work=The Sydney Morning Herald|first=Paul|last=Tatnell|title=Australian monster wave heralds huge surf for Sydney|date=17 September 2010}}</ref>
⚫ *Domestic and commercial property is advertised in square metres or hectares. Although crop yields are described in tonnes per hectare,<ref>{{cite web|url=http://www.abc.net.au/news/stories/2010/11/17/3068718.htm|title=High hopes for big crop yields - ABC News (Australian Broadcasting Corporation)|publisher=Abc.net.au|date=17 November 2010|accessdate=2 August 2011}}</ref> rural land area is occasionally reported in acres.<ref>{{cite news|url=https://www.standard.net.au/story/5748492/yangery-lifestyle-property-sells-for-9600-an-acre/|title=Yangery lifestyle property sells for $9600 an acre|last=Himmelreich|first=Everard|date=2018-11-08|work=The Standard|access-date=2018-11-14|language=en}}</ref><ref>{{cite web|url=http://www.aussiefarmsforsale.com/nsw.htm|title=NSW|publisher=Aussiefarmsforsale.com|accessdate=2 August 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110812181759/http://www.aussiefarmsforsale.com/nsw.htm|archivedate=12 August 2011}}</ref>


⚫ *Weather reports are measured in metric units<ref>{{cite news|url=http://weather.smh.com.au/local.jsp|work=The Sydney Morning Herald|title=Sydney Weather}}</ref> but occasionally refer to some wave heights in feet.<ref>{{cite news|url=http://www.smh.com.au/environment/australian-monster-wave-heralds-huge-surf-for-sydney-20100917-15f23.html|work=The Sydney Morning Herald|first=Paul|last=Tatnell|title=Australian monster wave heralds huge surf for Sydney|date=17 September 2010}}</ref>
⚫ Whilst imperial units may sometimes be specified instead of SI units (usually, where the product originates from or is intended for an American market), except for area measurements, the use of any measurement except in SI units is not "legal for trade" under Australian legislation.<ref>https://www.legislation.gov.au/Details/F2015C00296 - Schedules 1 & 2.</ref><ref>https://www.legislation.gov.au/Details/F2015C00010 Schedule 6- Permissible units of measurement</ref>


⚫ Whilst imperial units may sometimes be specified instead of SI units (usually, where the product originates from or is intended for an American market), the use of any measurement except in SI units is not "legal for trade" under Australian legislation.<ref>{{Cite web |last= |title=National Measurement Regulations 1999 |url=http://www.legislation.gov.au/Details/F2015C00296/Html/Text |access-date=2023-10-12 |website=www.legislation.gov.au |language=en}}</ref><ref>{{Cite web |last= |title=National Trade Measurement Regulations 2009 |url=http://www.legislation.gov.au/Details/F2015C00010/Html/Text |access-date=2023-10-12 |website=www.legislation.gov.au |language=en}}</ref>
⚫ Examples where non-SI units are (sometimes) specified are:


⚫ Further examples where non-metric units are (sometimes) specified are:
*Aviation, as in many other metric countries, specifies horizontal distances in nautical miles and horizontal speed in knots, but horizontal distance for visibility or clearance from clouds is in kilometres or metres, as are runway dimensions. (The pressure and temperature are also given in SI, with hectopascals and degrees Celsius respectively). Altitude and ascent/descent is given in feet and feet per minute.<!--I think this is rather superfluous, so commented out: The training manual warns, "Watch out – aviation charts and your altimeter are calibrated in feet, but topographical maps usually show contours and spot heights in metres!"<ref>{{cite web|url=http://www.abf.net.au/documentation/Training-Manual/Pt8NAV0605v1.pdf|title=ABF Pilot Training Manual, Part 8, Navigation, Version 1 - May 2006|year=2006|work=PDF Document|publisher=Australian ballooning Federation, Inc.|accessdate=11 February 2011}}</ref>--> *Aviation, as in many other metric countries, specifies horizontal distances in nautical miles and horizontal speed in knots, but horizontal distance for visibility or clearance from clouds is in kilometres or metres, as are runway dimensions. The pressure and temperature are also given in SI, with hectopascals and degrees Celsius respectively. Altitude and ascent/descent is given in feet and feet per minute.<!--I think this is rather superfluous, so commented out: The training manual warns, "Watch out – aviation charts and your altimeter are calibrated in feet, but topographical maps usually show contours and spot heights in metres!"<ref>{{cite web|url=http://www.abf.net.au/documentation/Training-Manual/Pt8NAV0605v1.pdf|title=ABF Pilot Training Manual, Part 8, Navigation, Version 1 - May 2006|year=2006|work=PDF Document|publisher=Australian ballooning Federation, Inc.|accessdate=11 February 2011}}</ref>-->
*Altitude for sky diving is routinely given in feet, which follows from the above existing Aviation "conventions".<ref>{{cite web|url=http://www.jumpthebeach.com.au/|title=Skydive Jump The Beach Mission Beach Queensland Australia Freefall Tandem Solo Courses|publisher=Jumpthebeach.com.au|accessdate=2 August 2011}}</ref><ref>{{cite web|url=http://www.parachutesaustralia.com/s2/acc_cypress.php|title=Parachutes Australia|publisher=Parachutes Australia|accessdate=2 August 2011}}</ref> (However, Scuba diving uses metric measures<ref>{{cite web|url=http://www.hmascanberra.com.au/metric-diving.htm|title=Litres, metres and bar - Diving with the metric system in Australia &#124; ex HMAS Canberra Reef|publisher=Hmascanberra.com.au|accessdate=2 August 2011}}</ref>)
*Australia uses metric paper sizes for office use and home printing. (A4=210×297&nbsp;mm)<ref>{{cite web|author=IMS|url=http://www.networkprinting.com.au/AcceptableFormats/PaperSizes.php|title=Sydney Australia Ph: 1300 556 744 Paper & Envelope Sizes|publisher=Network Printing|accessdate=2 August 2011}}</ref> However, the term '']'' (dpi) is still used when printing images.<ref>{{cite web|url=http://www.brother.com.au/labelprinters/products/default.asp|title=Label Printers - Products - QL Label Printers - Brother ® Australia|publisher=Brother.com.au|accessdate=2 August 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110821183557/http://www.brother.com.au/labelprinters/products/default.asp|archivedate=21 August 2011}}</ref> The photo printing industry usually uses imperial sizes for photograph dimensions (e.g. 4×6" rather than 10×15 cm). *Altitude for sky diving is routinely given in feet, which follows from the above existing aviation conventions.<ref>{{cite web|url=http://www.jumpthebeach.com.au/|title=Skydive Jump The Beach Mission Beach Queensland Australia Freefall Tandem Solo Courses|publisher=Jumpthebeach.com.au|accessdate=2 August 2011}}</ref><ref>{{cite web|url=http://www.parachutesaustralia.com/s2/acc_cypress.php|title=Parachutes Australia|publisher=Parachutes Australia|accessdate=2 August 2011}}</ref> Scuba diving uses metric units.<ref>{{cite web|url=http://www.hmascanberra.com.au/metric-diving.htm|title=Litres, metres and bar - Diving with the metric system in Australia &#124; ex HMAS Canberra Reef|publisher=Hmascanberra.com.au|accessdate=2 August 2011}}</ref>
*Australia uses metric paper sizes for office use and home printing (most commonly A4 size, being 210&nbsp;×&nbsp;297&nbsp;mm)<ref>{{cite web|author=IMS|url=http://www.networkprinting.com.au/AcceptableFormats/PaperSizes.php|title=Sydney Australia Ph: 1300 556 744 Paper & Envelope Sizes|publisher=Network Printing|accessdate=2 August 2011}}</ref> However, the term ] (dpi) is still used when referring to printing resolution.<ref>{{cite web|url=http://www.brother.com.au/labelprinters/products/default.asp|title=Label Printers - Products - QL Label Printers - Brother ® Australia|publisher=Brother.com.au|accessdate=2 August 2011|url-status=dead|archiveurl=https://web.archive.org/web/20110821183557/http://www.brother.com.au/labelprinters/products/default.asp|archivedate=21 August 2011}}</ref> The photo printing industry uses both imperial and metric sizes for photograph dimensions (e.g. 4&nbsp;×&nbsp;6 inches as well as 10&nbsp;×&nbsp;15&nbsp;cm).
*Historical writing and presentations may include pre-metric units to reflect the context of the era represented. *Historical writing and presentations may include pre-metric units to reflect the context of the era represented.
⚫ *]s for the screens of ]s and computer monitors may be described as having their ]s measured in inches instead of or as well as centimetres, e.g., a screen may be advertised as 42" (107&nbsp;cm).
*Vehicle tyres (as in the rest of the world) mark the rim diameter in inches and the width in millimetres. A car tyre marked '165/70R13' has a width of 165 mm, an aspect ratio (profile) of 70% and a 13-inch rim diameter. Tyre pressures may be given in both kilopascals and "pounds per square inch".<ref>{{cite web|url=http://www.bridgestone.com.au/tyres/passenger/care/pressure.aspx|title=Bridgestone Tyre pressure tips|year=2007|work=web page|publisher=Bridgestone Australia Corporate|accessdate=4 June 2011}}</ref>
⚫ *]s for the screens of ]s and computer monitors may be described as having their ]s measured in inches instead of or as well as centimetres, e.g., a ] may be advertised as 42" (1,066.8 mm).
*Firearm barrel length is almost always referred to in inches, whereas ammunition is measured in grams. *Firearm barrel length is almost always referred to in inches, whereas ammunition is measured in grams.
⚫ Cultural influence from the UK and USA has also been cited as a reason for the residual use of imperial units.<ref name=USMA/>


==See also==
⚫ The cultural transmission of British and American English in Australia has also been noted to be a cause for residual use of imperial units.<ref name=USMA/>
{{Portal|Australia}}
*]


==References== ==References==
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Latest revision as of 19:01, 9 November 2024

Adoption of the metric system of measurements in Australia

Metrication in Australia effectively began in 1966 with the conversion to decimal currency under the auspices of the Decimal Currency Board. The conversion of measurements—metrication—commenced subsequently in 1971, under the direction of the Metric Conversion Board and actively proceeded until the Board was disbanded in 1981.

Before 1970, Australia mostly used imperial units, inherited from the United Kingdom. Between 1970 and 1988, imperial units were withdrawn from general legal use and replaced with the International System of Units, facilitated through legislation and government agencies. SI units are now the only legal units of measurement in Australia. Australia's largely successful transition to the metric system parallels that of metrication in New Zealand but contrasts with metrication in the United States and metrication in the United Kingdom.

History

Although there was debate in Australia's first Parliament after federation to consider adopting the metric system, metric units first became legal for use in Australia in 1947 when Australia signed the Metre Convention (or Convention du Mètre). However, Imperial weights and measures were most commonly used until the Commonwealth government began the metric changeover in the 1970s. SI units were subsequently adopted as the basis for Australia's measurement standards, whereby they were defined as Australia's legal units of measurement.

In 1968, a Select Committee of the Australian Senate chaired by Keith Laught examined metric "Weights and Measures" and came to the unanimous conclusion that it was both practical and desirable for Australia to change to the metric system. Some of their considerations included the "inherent advantages of the metric system" that meant that weighing and measuring was facilitated, "often with substantial increases in efficiency". Educationally, the reform would "simplify and unify the teaching of mathematics and science, reduce errors, save teaching time, and give a better understanding of basic physical principles". In 1968, more than 75% of Australia's exports went to metric countries, and at that time it was noted that all countries (except the United States) were metric or were converting to the metric system. It was also noted that because of Australia's large migrant program, more than 10 percent of people over 16 years of age had used the metric system before coming to Australia. They also noted that school pupils were widely familiar with the metric system because it had been taught in the schools for many years.

By 1968, metrication was already well underway in Australian industry. The pharmaceutical industry had metricated in 1965, and much of the chemical and electronics industries worked in metric units, as there were no imperial units for the latter. One of the country's major automobile manufacturers had already declared its intention to metricate before the Government announced its decision to change to the metric system. "The change itself provided a unique opportunity to rationalise and modernise industrial practices and bring Australia's technical standard specifications into accord with those adopted internationally".

On 12 June 1970, the Australian Metric Conversion Act passed by the Australian Parliament was given assent. This Act created the Metric Conversion Board to facilitate the conversion of measurements from imperial to metric. A timeline of major developments in this conversion process is as follows:

Metric Conversion Board

Opposition to metrication was not widespread. The Metric Conversion Board did not proceed with education programs as polling revealed that most people were learning units and their applications independently of each other, rendering efforts to teach the systematic nature of the metric system unnecessary and possibly increasing the amount of opposition. The Board was dissolved in 1981, but the conversion to the metric system was not completed until 1988. The Board spent A$5.955 million during its 11 years of operation, and the federal government distributed $10 million to the states to support their conversion process. Between 1984 and 1988, the conversion was the responsibility of the National Standards Commission, later renamed the National Measurement Institute in 1988. The cost of metrication for the private sector was not determined but the Prices Justification Tribunal reported that metrication was not used to justify price increases.

Metrication of horse racing

The first metric Melbourne Cup was raced in November 1972

An early change was the metrication of horse racing. This was facilitated because the furlong (one-eighth of a mile) is close to 200 m. Therefore, the Melbourne Cup was changed from 2 mi to 3,200 m, a reduction of 19 m or about 0.6%. The first metric Melbourne Cup was raced in November 1972.

Metrication of weather reporting and forecasts

When the Australian Bureau of Meteorology was enlisted to introduce the metric system for weather reporting and forecasts, its public relations officer, Godfrey Wiseman, coined a series of jingles to educate the public, using the terms frosty fives, tingling tens, temperate twenties, thirsty thirties and fiery forties to describe human sensation to temperatures in degrees Celsius. This was very successful because the public soon became aware of the significance of the descriptions.

At the culmination of this campaign, weather reports and forecasts in both Fahrenheit and Celsius were provided for one month only. After that, from 1 September 1972, only Celsius measurements were given for temperature.

Similarly, wind speed was reported only in kilometres per hour (km/h) from 1 April 1973 and rainfall was reported in millimetres – with river depths, snow depths and waves reported in metres – from 1 January 1974.

Metrication of the road signs

Speed limits signs in km/h had the number indicating the speed limit inside a red circle.

An important and very visible sign of metric conversion in Australia was the change in road signs and the accompanying traffic regulations; "M-day" for this change was 1 July 1974. Because of careful planning, almost every road sign in Australia was converted within a month. This was achieved by installing covered metric signs alongside the imperial signs before the change and then removing the imperial sign and uncovering the metric sign during the month of conversion.

While road signs could not all be changed at the same time, there was little chance of confusion as to what any speed limit sign meant during this short change-over period. This was because the previous mph signs had the signage in black on white and were rectangular, in the same style as current US speed limit signs, whilst the km/h signs which replaced them had the number indicating the speed limit inside a red circle, as is done in Europe.

Road distance signs were also converted during this period. To avoid confusion as to whether the distance indicated was in miles or kilometres new major distance signs had affixed to them a temporary yellow plate showing the symbol km. On the many new kilometre signs on minor roads, a yellow plate which showed the corresponding number of miles was affixed under the now permanent kilometre distance indication. These temporary plates were removed after about one year.

Except for bridge clearance and flood-depth signs, dual marking was avoided. Though people opposed to metrication expressed concern that ignorance of the meaning of metric speeds would lead to accidents on the roads, this did not happen, as most drivers under the age of 25 had been taught metric units at school, and through them, their parents were familiar with metric speeds, if not metric units as a whole.

It was believed that public education would be the most effective way of ensuring public safety. A Panel for Publicity on Road Travel made up of the various motoring organisations, regulatory authorities, and the media, planned a campaign to publicise the change. The resulting publicity campaign cost $200,000 and the Australian Government Department of Transport paid for it. The Board also produced 2.5 million copies of a pamphlet, "Motoring Goes Metric". This was distributed through post offices, police stations, and motor registry offices.

"For about a year before the change, motor car manufacturers fitted dual speedometers to their vehicles and, after 1974, all new cars were fitted with metric-only speedometers. Several kinds of speedometer conversion kits were available.

"As a result of all these changes, conversion on the roads occurred without incident."

Building and construction

A measuring tape showing millimetres

The building industry was the first major industry grouping in Australia to complete its change to metric. This was achieved within two years by January 1976 for all new buildings other than those for which design had commenced well before metrication began. The resulting savings for builders and their sub-contractors has been estimated at 10% of gross turnover.

In this, the industry was grateful to Standards Australia for the early production of the Standard AS 1155-1974 "Metric Units for Use in the Construction Industry", which specified the use of millimetres as the small unit for the metrication upgrade. In the adoption of the millimetre as the "small" unit of length for metrication (instead of the centimetre) the Metric Conversion Board leaned heavily on experience in the United Kingdom and within the International Organisation for Standardisation, where this decision had already been taken.

This was formally stated as follows: "The metric units for linear measurement in building and construction will be the metre (m) and the millimetre (mm), with the kilometre (km) being used where required. This will apply to all sectors of the industry, and the centimetre (cm) shall not be used. … the centimetre should not be used in any calculation and it should never be written down".

The logic of using the millimetre in this context was that the metric system had been so designed that there would exist a multiple or submultiple for every use. Decimal fractions would not have to be used. Since the tolerances on building components and building practice would rarely be less than one millimetre, the millimetre became the sub-unit most appropriate to this industry.

Electrical wiring converted from imperial measurements such as 1/044, 1/064, 3/036, 7/029 or 7/036 to metric 1.5mm², 2.5mm² or 4.0mm² wire sizes.

Extent

Metrication is complete, with some exceptions:

  • Road signs solely use metric measurements, as do the speedometers and odometers in motor vehicles produced after 1974. However, there was no requirement for pre-1974 vehicles to have their speedometers and odometers converted to metric, so vintage cars display miles and miles per hour, and privately imported vehicles, such as classic cars, are not required to be converted.
  • Oil and petrol is sold in litres. Vehicle tyres (as in the rest of the world) mark the rim diameter in inches and the width in millimetres, such that a tyre marked '165/70R13' has a width of 165 mm, an aspect ratio (profile) of 70% and a 13-inch rim diameter. Tyre pressures may be given in either kilopascals (kPa) or pounds per square inch (PSI).
  • Fruit and vegetables are advertised, sold, and weighed in grams, and groceries are packed and labelled in metric units. Schooling is wholly metric. Newspaper reports are nearly always in metric.
  • In some cases, old imperial standards were replaced with rounded metric values, as with horse racing or the size of beer glasses (rounded to the nearest 5 cm). The pre-metric names of beer glass sizes, including the pint, have been retained (although in South Australia the "pint" of beer is not an imperial pint, as it is elsewhere in Australia).
  • Dressed timber is often sold in lengths such as 1.8, 2.4, 3.0, and 3.6 metres, each multiples of 300 mm, approximating foot-length increments, while pipes and conduits may be specified as having diameters of 12, 19, 25, and 32 mm (based on "soft" conversions of 0.5, 0.75, 1, and 1.25 inches).
  • In some cases, goods manufactured to pre-metric standards are available, such as some bolts, nuts, screws, and pipe threads.
  • Body weight is referred to in kilograms, and baby nappy sizes are specified in grams only. A few parents still convert their baby's hospital-stated birth mass to pounds and ounces.
  • Human height is measured in centimetres. In informal contexts, a person's height may be stated in feet and inches.
  • Domestic and commercial property is advertised in square metres or hectares. Although crop yields are described in tonnes per hectare, rural land area is occasionally reported in acres.
  • Weather reports are measured in metric units but occasionally refer to some wave heights in feet.

Whilst imperial units may sometimes be specified instead of SI units (usually, where the product originates from or is intended for an American market), the use of any measurement except in SI units is not "legal for trade" under Australian legislation.

Further examples where non-metric units are (sometimes) specified are:

  • Aviation, as in many other metric countries, specifies horizontal distances in nautical miles and horizontal speed in knots, but horizontal distance for visibility or clearance from clouds is in kilometres or metres, as are runway dimensions. The pressure and temperature are also given in SI, with hectopascals and degrees Celsius respectively. Altitude and ascent/descent is given in feet and feet per minute.
  • Altitude for sky diving is routinely given in feet, which follows from the above existing aviation conventions. Scuba diving uses metric units.
  • Australia uses metric paper sizes for office use and home printing (most commonly A4 size, being 210 × 297 mm) However, the term dots per inch (dpi) is still used when referring to printing resolution. The photo printing industry uses both imperial and metric sizes for photograph dimensions (e.g. 4 × 6 inches as well as 10 × 15 cm).
  • Historical writing and presentations may include pre-metric units to reflect the context of the era represented.
  • Display sizes for the screens of TVs and computer monitors may be described as having their diagonals measured in inches instead of or as well as centimetres, e.g., a screen may be advertised as 42" (107 cm).
  • Firearm barrel length is almost always referred to in inches, whereas ammunition is measured in grams.

Cultural influence from the UK and USA has also been cited as a reason for the residual use of imperial units.

See also

References

  1. ""Dollar Bill" Currency Conversion Advertisement—1966". Video. Commonwealth of Australia—Sound and Film Archive. 15 August 2010. Archived from the original on 21 December 2021.
  2. ^ "History of Measurement in Australia". Australia's Measurement System. National Measurement Institute. Retrieved 16 October 2010.
  3. "How Australia's measurement system works". Australia's Measurement System. National Measurement Institute. Retrieved 21 November 2009.
  4. Tilby Stock, Jenny (2010). "Laught, Keith Alexander (1907–1969))". The Biographical Dictionary of the Australian Senate. Vol. 3. UNSW Press.
  5. ^ "Introduction of the metric system in Australia Support for the change". Government of Western Australia. 4 March 2010. Archived from the original on 4 July 2009. Retrieved 8 May 2010.
  6. "Australia ACORN-SAT temperature fraction audit". web page. WA climate net. December 2009. Retrieved 4 December 2012.
  7. Metric conversion ad—1974 YouTube.
  8. ^ "Metrication of Australia". Metric usage and metrication in other countries. U.S. Metric Association. 1996–2009. Retrieved 26 November 2009.
  9. "Melbourne Cup History". Aussie Punter. Archived from the original on 3 June 2010. Retrieved 2 August 2011.
  10. 1 September 1972. Temperature and Pressure go Metric. Bureau of Meteorology. Retrieved on 12 October 2023.
  11. "Select Committee on the Metric System of Weights and Measures / Senate Committees".
  12. "Wording and Verification of Forecasts". Federation and Meteorology. Australian Science and Technology Heritage Centre. Retrieved 30 July 2015.
  13. "Road Metric Conversion Advertisement—1974". Video. Commonwealth of Australia—Sound and Film Archive. 21 October 2008.
  14. ^ "Motoring Goes Metric" (PDF). Pamphlet. Metric Conversion Board. 1974.
  15. Kevin Wilkes (1992). "Metrication in Australia". Book. Commonwealth of Australia. Retrieved 17 February 2011A quotation from the book appears at the link provided{{cite web}}: CS1 maint: postscript (link)
  16. ^ Kevin Wilkes (1992). "Metrication in Australia" (PDF). Book. Commonwealth of AustraliaEntire document.{{cite web}}: CS1 maint: postscript (link)
  17. Metrication in Australia. Section 9.2 Page 34. Department of Industry Technology and Commerce. Retrieved on 12 October 2023.
  18. http://www.metricationmatters.com/docs/CostOfNonMetrication.pdf Sub Answer 3. 1.
  19. ISO 2848
  20. Standards Association of Australia "Metric Handbook, Metric Conversion in Building and Construction" 1972
  21. "What size CB for regular power circuit? 16 or 20? - Kitchen appliances".
  22. "Bridgestone [Australia] Tyre pressure tips". web page. Bridgestone Australia Corporate. 2007. Retrieved 4 June 2011.
  23. "Archived copy" (PDF). Archived from the original (PDF) on 12 March 2011. Retrieved 17 February 2013.{{cite web}}: CS1 maint: archived copy as title (link)
  24. "Metzeler AU - Tyre Pressures". Archived from the original on 2 March 2013. Retrieved 17 February 2013.
  25. "Why is Adelaide's pint glass different to the rest of Australia?". ABC News. 7 September 2017. Retrieved 12 October 2023.
  26. Dressed Timber. Bunnings. Retrieved on 12 October 2023.
  27. admin, on 27 August 2009 (27 August 2009). "what screw size and thread measurement do we use for hardware? | the scrooz blog". Scrooz.com.au. Archived from the original on 22 August 2011. Retrieved 2 August 2011.{{cite web}}: CS1 maint: numeric names: authors list (link)
  28. "Nuts and Bolts - Industrial Size Assortment Packs of Hi-Tensile Nuts & Bolts". Bolts.com.au. Retrieved 2 August 2011.
  29. "Pipe Thread, Tapered Screw Plug and Screw Ring Gauges". Prittie.com.au. Retrieved 2 August 2011.
  30. ^ "Profiles of Health, Australia, 2011-13". abs.gov.au. Australian Bureau of Statistics. 29 October 2012. Retrieved 15 October 2014.
  31. "Jenny Craig : New look Magda Szubanski sheds kilos on Jenny Craig". www.jennycraig.com.au. Archived from the original on 14 September 2009.
  32. "Nappies product range - Find advice on baby products at". Huggies.com.au. Retrieved 2 August 2011.
  33. "Snugglers® Australia - Our Products". Snugglers.com.au. Archived from the original on 29 August 2007. Retrieved 2 August 2011.
  34. An example where some birth masses are given in pounds and ounces.
  35. "I was 34 weeks pregnant when I was told I had gestational diabetes. Here's how I managed". Mamamia. 5 November 2018. Retrieved 14 November 2018.
  36. Beth Price; David Tynan; Natalie Caruso; Allason McNamara; Gloria Stillman; Jill Brown (2009). MathsWorld Year 8 VELS Edition. Australia: MacMillan. p. 626. ISBN 9780732992514. Retrieved 5 July 2014.
  37. "Kawasaki Sportsbike Riders Club - Australia - Online Forum • View topic - ZZR 600 Seat Height Question". Ksrc-au.com. Retrieved 2 August 2011.
  38. At least one Australian internet dating service uses metric units for height with the imperial measurement alongside.
  39. "High hopes for big crop yields - ABC News (Australian Broadcasting Corporation)". Abc.net.au. 17 November 2010. Retrieved 2 August 2011.
  40. Himmelreich, Everard (8 November 2018). "Yangery lifestyle property sells for $9600 an acre". The Standard. Retrieved 14 November 2018.
  41. "NSW". Aussiefarmsforsale.com. Archived from the original on 12 August 2011. Retrieved 2 August 2011.
  42. "Sydney Weather". The Sydney Morning Herald.
  43. Tatnell, Paul (17 September 2010). "Australian monster wave heralds huge surf for Sydney". The Sydney Morning Herald.
  44. "National Measurement Regulations 1999". www.legislation.gov.au. Retrieved 12 October 2023.
  45. "National Trade Measurement Regulations 2009". www.legislation.gov.au. Retrieved 12 October 2023.
  46. "Skydive Jump The Beach Mission Beach Queensland Australia Freefall Tandem Solo Courses". Jumpthebeach.com.au. Retrieved 2 August 2011.
  47. "Parachutes Australia". Parachutes Australia. Retrieved 2 August 2011.
  48. "Litres, metres and bar - Diving with the metric system in Australia | ex HMAS Canberra Reef". Hmascanberra.com.au. Retrieved 2 August 2011.
  49. IMS. "Sydney Australia Ph: 1300 556 744 Paper & Envelope Sizes". Network Printing. Retrieved 2 August 2011.
  50. "Label Printers - Products - QL Label Printers - Brother ® Australia". Brother.com.au. Archived from the original on 21 August 2011. Retrieved 2 August 2011.

Further reading

Metrication or its opposition by country
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