Acres to Square kilometers converter

To convert acres to square kilometers, enter the value in the first field. The result in square kilometers is calculated automatically using the exact conversion factor.

1 ac = 0.0040468564224 km²
1 km² ≈ 247.105381467 ac

Formula: km² = ac × 0.0040468564224
ac ≈ km² × 247.105381467

Definitions: 1 ac = 43560 ft²; 1 km² = 1000000 m²

The acre (ac) is 43,560 square feet, about 4,047 square meters or 0.4047 hectares. It is used for land area in the United States and, informally, in the United Kingdom and Canada, and traditionally it was the area a team of oxen could plow in a day.

The square kilometer (km²) is one million square meters. It is used for the area of cities, lakes, countries and other large regions.

See the conversion table with commonly used values, handy for quick reference or study.