The units of measure in use in Puerto Rico are based on the United States customary units with two major exceptions: roadway distance signs are measured in kilometers and gasoline is sold by the liter.
In Puerto Rico, a cuerda is a traditional unit of land area nearly equivalent to 3,930 square meters, or 4,700 square yards, 0.971 acre, or 0.393 hectare (ha).
A cuerda and an acre have often been treated as equal because they are nearly the same size.
It continues to be an official unit of land measure in Puerto Rico today (2019).
[1] This was a unit of land measurement in the Spanish Viceroyalties in the Americas during the times of the Spanish Empire in the 16th through 19th centuries Puerto Rico.