About Units

Acre: An acre is a unit of area commonly used in the United States and the United Kingdom. It is equal to 4,840 square yards or 43,560 square feet. The term "acre" comes from an Old English word meaning "field" and was originally used to measure a piece of land that could be plowed in one day by a yoke of oxen.

Square miles: A square mile is a unit of area in the imperial and US customary systems. It is equal to 640 acres or approximately 2.59 square kilometers. Square miles are typically used to measure larger areas, such as the size of cities, counties, or large natural features like lakes and forests.