Convert Acres to square kilometers

1 acre = 0.004046856 square kilometers · km² = ac ÷ 247.1053815

ac
Square kilometers
0.004046856km²

1 acre = 0.004046856 square kilometers

When you need this conversion

This conversion goes from acres, the land measure used in the US and UK, to square kilometers, used for cities, parks, and regions. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.

Acres to square kilometers conversion table

Conversion table from acres to square kilometers
Acres (ac)Square kilometers (km²)
1 ac0.004046856 km²
2 ac0.008093713 km²
3 ac0.012141 km²
5 ac0.020234 km²
10 ac0.040469 km²
15 ac0.060703 km²
20 ac0.080937 km²
25 ac0.101171 km²
50 ac0.202343 km²
75 ac0.303514 km²
100 ac0.404686 km²
250 ac1.0117 km²
500 ac2.0234 km²
1,000 ac4.0469 km²

The formula

km² = ac ÷ 247.1053815

Because both units measure area, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.

Convert the other way

Square kilometers to acres →

Related area conversions

All area conversions →

Frequently asked questions

How many square kilometers are in a acre?
There are 0.004046856 square kilometers in 1 acre. The formula is km² = ac ÷ 247.1053815.
How do you convert acres to square kilometers?
Use the formula km² = ac ÷ 247.1053815. For example, 10 acres equals 0.040469 square kilometers.
Is the acres to square kilometers conversion exact?
Yes. Acres and square kilometers are both units of area, related by an exact defined factor. Displayed results are rounded for readability.
What is ac short for?
ac is the standard symbol for acre. km² is the symbol for square kilometer.