Puerto Rican units of measurement
Several units of measurements were used in Puerto Rico. The metric system has been compulsory since 1860 in Puerto Rico. However, there are exceptions, such as speed limits posted in miles per hour along roadways.
System before metric system
Several units were used before metric adoption. These units were older Spanish units.
- Washburn, E.W. (1926). International Critical Tables of Numerical Data, Physics, Chemistry and Technology. 1. New York: McGraw-Hil Book Company, Inc. p. 10. Retrieved 8 February 2015.
- Units - Cuerda. Sizes.com. Puerto Rico Act 135, section 4 (page 100), 1913–14, as amended by Act No. 3, 1913–14: A cuerda, quote: "a unit of land area, approximately 3,930 square meters (approximately 0.971 acres)...In land measurements and records, the measurement by cuerda customarily used in Porto [sic] Rico...equivalent to 3,930.395625 square meters..."