# Mexican units of measurement

A number of units of measurement were used in Mexico to measure length, mass, area, capacity, etc. The Metric system was optional from 1857, and has been compulsory since 1896.[1][2]

## System before metric system

The Units of the system (from Spanish, Castillian) were legally defined during the transition period of the metric system.[1]

## Length

A number of units were used. One vara (lit. "pole", "yard") was equal to 0.838 m (32.99 inches) as it was legally defined also use inches and feet.[1] Some other units and legal equivalents are given below:

1 linea (lit. "line") = ^{1}⁄_{432} vara

1 pulgada (lit. "thumbful", "inch") = ^{1}⁄_{36} vara

1 pie (lit. "foot") = ^{1}⁄_{3} vara

1 milla (lit. "mile") = 5000 pies[3]

## Mass

A number of units were used. One libra (lit. "pound") was equal to 0.46024634 kg as it was legally defined.[1] Some other units and legal equivalents are given below:

1 tomin = ^{1}⁄_{768} libra

1 adarme = ^{1}⁄_{256} libra

1 ochava ("eighth") = ^{1}⁄_{128} libra

1 onza ("ounce") = ^{1}⁄_{16} libra

1 arroba = 25 libras

1 quintal ("hundredweight") = 100 libras

1 terco = 160 libras[1]

## Area

A number of units were used. One fanega was equal to 35662.8 m^{2} as it was legally defined.[1] Some other units and legal equivalents are given below:

1 caballeria = 12 fanegas

1 labor = 18 fanegas

## Capacity

Two systems, dry and liquid, were used.

## References

- Washburn, E.W. (1926).
*International Critical Tables of Numerical Data, Physics, Chemistry and Technology*.**1**. New York: McGraw-Hil Book Company, Inc. p. 9. Retrieved 8 February 2015. - Cardarelli, F. (2003).
*Encyclopaedia of Scientific Units, Weights and Measures. Their SI Equivalences and Origins*. London: Springer. p. 7. ISBN 978-1-4471-1122-1. - Cardarelli, F. (2003).
*Encyclopaedia of Scientific Units, Weights and Measures. Their SI Equivalences and Origins*. London: Springer. pp. 164–165. ISBN 978-1-4471-1122-1. - Clarke, F.W. (1891).
*Weights Measures and Money of All Nations*. New York: D. Appleton & Company. p. 51.