welcome to aatideas.org ! if linked pages do not load , then please kindly try a full-featured browser app .

for Metrication Month 2020 ( MMe0 ) , Alliance for the Advancement of Technology summarizes metrication of person-height . the centimeter ( cm ) is a practicable unit for a variety of formats for writing height measures . pre-metric measures can also be practicably metricated in terms of a practicable precision , in terms of whole numbers or numbers with a decimal place .

- overview
- person-height and metrication
- person-height measured
- person-height estimated or approximated
- metrication from pre-metric
- table MMe0 t01 -- reference from pre-metric foot-inch
- table MMe0 t02 -- approximate person-height within 5 cm
- acknowledgements

the centimeter ( cm ) is a practicable unit for a variety of formats for writing height measures .

there is a standard for measuring person-height to the nearest 0.1 cm .

measuring in terms of metric units is the most practicable means of metrication .

pre-metric measures can also be practicably metricated in terms of a practicable precision , in terms of whole numbers or numbers with a decimal place .

a pre-metric measure of person-height to the nearest inch can be practicably metricated within 5 cm . if the pre-metric measure was determined to at least the nearest 1/4 inch then the measure can be practicably metricated within 1 cm .

metrication—a process of learning about or practicing the use of metric measures .

a person's height is practicably measured with reference to the metric SI meter ( International System of Units ) . in much of the world it is customary to note person-height to the centimeter . it is also commonly practicable to refer to estimates or approximations of a person's height within 5 cm . a person's height in terms of centimeters can moreover be expressed in terms of a whole number to three places ( using a leading zero for measures less than 1 meter ) .

Australia metricated from the pre-metric foot-inch scales in the 1970s . two Australian standards for noting person-height are measured and self-reported .

person-height (measured), total centimeters NN[N].N

measured per metric scales to the nearest 0.1 centimeter

https://meteor.aihw.gov.au/content/index.phtml/itemId/270361

the standard for measured person-height defines methods for determining height to the nearest 0.1 centimeter.

the centimeter is a practicable unit for different formats for writing height . measuring in terms of metric units is the most practicable means of metrication .

person-height (self-reported), total centimeters NN[N]

https://meteor.aihw.gov.au/content/index.phtml/itemId/270365

person-height is oftentimes self-reported or estimated . if additional methods are not specified , then estimates may or may not count footwear, hatwear , or hairstyle as a part of person-height . at the same time , so many uses of person-height data might not require more than an approximation of person-height . approximate measures can also be useful toward a transition to metrication of person-height data .

person-height data that is self-reported might or might not have been determined to a particular precision , and an uncertainty of measurement might or might not have been established . thus questions about the foot and inch measure might concern whether a particular person-height datum was measured or was estimated . it might also be relevant to know when a person-height datum was measured or estimated . in any case it is important to not rely on an approximation when a precise measurement is called for .

if a measure of person-height includes a fraction of an inch as a part of the noted height , then a rough uncertainty can include the denominator of the fraction . however the denominator won't always equal a rough uncertainty . an expression noted as 1/2 of an inch might not show whether a rough uncertainty was determined from a measure of 8/16 , from 4/8 , from 2/4 , or from 1/2 . that range of scalar-precision represents an 8-fold difference in the precision that might affect whether the measure could be metricated to the centimeter , or would call for an approximation like within 5 cm . at least using a decimal place fraction to significant figures resolves further uncertainties .

an estimated measure can be practicably specified to an approximate person-height within 5 cm . to approximate person-height within 5 cm , take a measured person-height if it is a multiple of 5 cm , or round up to the next higher multiple of 5 cm . the approximate height should be within 5 cm of a measured height ( which is also within 2 pre-metric inches ) . measures from the foot-inch scales within 1 inch are likewise within 2.54 cm , which would not affect an approximation of height within 5 cm .

considering a hypothetical measure of height that is noted in the pre-metric foot-inch scales , 5 foot 0 inch is also equivalent to 60 inches .

the expression indicates a measure with a precision to the inch , or as within 1 inch , and not more precise than within one inch .

thus as an intermediate step an exact conversion of 60 inches is 152.4 cm , for which as another intermediate step it is practicable to round up to 153 cm .

in practice it is often practicable to estimate a person's approximate height within 5 cm , in which it is practicable to round up to the nearest multiple of 5 cm . so the initial 60 inch measure ( 5 foot 0 inch ) could when estimating or approximating within 5 cm be noted as approximately 155 cm .

in each step of this example the scale value rounded is less than the precision of the scale .

thus for a precision of within 1 inch a rounding to the nearest centimeter is not more than 1.27 cm ( rounded up or down as applicable , 2.54 cm divided by 2 ) .

and a precision of within 5 cm is less than 2 inches ( rounding up as applicable ) .

at the same time a pre-metric measure of height within 0.25 inch can be determined to the nearest centimeter .

in the example of a person-height being measured to the nearest 0.1 centimeter , as hypothetically 152.4 cm , then a metric measure might also be written as 1.524 m . although equivalent to 1524 mm , so many references to person-height are not that precise . precision to the millimeter in the pre-metric inch scale would require a precision to 5/127 of a pre-metric inch ( not that a fraction with a large prime number as the denominator would be practicable ) .

for information about unrounded comparisons , not a format !

rounded up to 5 cm increments , reference inches rounded up to nearest inch

acknowledgements to Pat Naughtin and the USMA ( US Metric Association ) mailing list who have previously discussed topics of metrication of person-height .

contents of this web site copyright © 2020 UCA and prior , Alliance for the Advancement of Technology .

mission, terms of use, privacy, e quality guarantee, search, contact AAT.

aatideas.org web page updated: |

UCN 12020 K14 Red ✦ day 284 ✦ IDC zone(UT) t333 tt333 |

2020 day 284 ✦ t333 |

AD 2020 October 10 Saturday ✦ SMH UT 08:00:00 |