Metrication in Guatemala

In Guatemala the metric system is official but it uses a mixture of U.S., metric and Spanish customary units.
History.
In May 1910 most of Central America adopted a common system of measurements.
In May 1921 Guatemala became officially metric.
Non metric units used today.
Among the Guatemalan units of measurement some are based on old Spanish units; they include the "vara" and "cuadra" linear measurements; the "vara cuadrada", the "manzana" and the "cuerda" units of area; and the "libra", "arroba", "quintal" and "garrafón" units of weight and volume.
The "vara cuadrada" or square vara is commonly used in land transactions in Guatemala and 10,000 square varas equal one "manzana".
One square vara equals , while one "manzana" equals .
The term cuerda can refer to areas of different sizes. Cuerdas can refer to areas that are 50 x 50, 40 x 40, 30 x 30, 25 x 25 or 20 x 20 varas (i.e. 2500, 1600, 900, 625, or 400 square varas). In addition, some sources describe a cuerda as 32 x 32 varas. In Guatemala, the linear vara is 0.8421 meters. (The length of vara varies slightly among different Latin American countries.) 
A Spanish pound "(libra)" is 460 grams.
US Customary Units Used in Guatemala Today.
Some United States customary units are also used in Guatemala. These include gallons inches, feet, miles, pounds (note the Spanish pound is also used) and ounces. 