# Square mile conversions

area conversions » square mile conversionsThe online converter calculator on this page allows you to select the area/surface measurement unit you want to convert to starting from square miles (sq mi). To make a conversion starting from a unit of area other than square mile, simply click on the "Reset" button.

## What is square mile?

### Definition:

The square mile is a unit of area in the Imperial and US customary systems of units equal to 2,589,988.11 square meters (1 sq mi = 2,589,988.11 m2), the standard derived unit of area in the International System of Units (SI). It is also equal to 258.998811 hectares (ha) (a unit of area in the metric system), or 2.58998811x1010 square centimeters (cm2) or 2.58998811 square kilometers (km2) (units of area in the SI), or 2,560 roods (an Imperial unit of area), or 640 acres (ac), or 27,878,400 square feet (sq ft) or 3,097,600 square yards (sq yd), which are Imperial / US customary units of area.

The square mile (sq mi) is an Imperial / US customary unit of area. The mile (mi) is a unit of length in the Imperial and US customary systems of units. An area of 1.0 square mile is the area of a square that is 1.0 mile on each side.

### Symbol:

sq mi

### Plural:

square miles

Below you can find a comprehensive list with conversions from square miles to other (metric, imperial, or customary) area and surface measurement units.