**Acres to square kilometers** area measurement units conversion factor is 0.00404685642. To find out how many square kilometers in acres, multiply by the conversion factor or use the converter.

**1 Acre = 0.00404685642 Square Kilometers**

**There are 0.00404685642 square kilometers in an acre**, because there are 1000000 (one million) sq. meters (or **10 763 910.417 sq. feet**) in a sq. kilometer and an acre is defined as an area of 43560 square feet (66 ft * 660 ft), that makes 43560 / 10763910.417 = 0.00404685642 sq. kilometers in an acre.

For example, to find out how many sq. kilometers there are in 1000 acres, multiply the acre value by the conversion factor, that makes 1000 * 0.00404685642 = 4.04 sq. kilometers in 1000 acres.

**Acre** is an imperial and US customary systems area unit and equals to 0.404686 hectares, 4046.86 sq. meters and 43560 sq. feet. The abbreviation is "**ac**".

**Square kilometer** is a metric system area unit and equals to 247.105 acres, 100 hectares and 0.386 sq. miles. The abbreviation is "**km**^{2}".