Distance Measures


4 poles or rods, or 22 yards, or 66 feet, or 1/80 of a mile.

Statute Mile

5,280 U.S. survey feet, or approximtely 1.6 km.

U.S. Inch

approximately 2.54 cm, or 3 barley corns

U.S. Survey Foot

12 inches, or 12/39.37 meter exactly, or approximately 30.480061 cm.

International Foot

30.48 cm. exactly.

French Foot

1.06575 U.S. Survey Foot. This measure is encountered in Lousiana land titles.


160/30 French feet (30 toises = 160 French feet), or approximately 5.68 feet


30 toises, or 160 French feet, or approximately 170.5 feet

Rod, Perch, Pole

16.5 feet. This unit was defined in the 16th century as the length of the left feet of the first 16 men out of church on a certain Sunday.


330 feet, or 5 chains


approximately 33 inches. This unit is found in the Southwest U.S. where Spanish land boundaries were measured in this unit. It's exact length varies from region to region. In California, a vara is 33 inches. In Texas, a vara is 33-1/3 inches. In Florida, a vara is 33.372 inches.

Area Measures


43,560 square feet, or 4,840 square yards, or 10 square chains, or 1/640 square mile

Square Rood

1/4 acre


10,000 square meters, or approximately 2.47 acres


177.14 acres


4,428.40 acres

Square mile

640 acres


approximately 0.85 acres. This unit is found in the south central U.S. where French land titles were measured in this unit. It's size varies from region to region. In Arkansas and Missouri it is 0.8507 acres. In Mississippi, Alabama, and Florida, it is 0.84625 acres. In Louisiana it is 0.845 acres