Convert acres to square kilometers
Enter a acres value below and convert to square kilometers
ac
1 acre ≈
0.00405 square kilometers
* rounded result
Select how many decimal places the result will be rounded to:
How to convert acres to square kilometers
To convert acres to square kilometers, multiply a acres value by 0.0040468564224.
Formula km² = ac × 0.0040468564224
Example: Convert 1000 acres to square kilometers Calculations: 1000 ac × 0.0040468564224 ≈ 4.0469 km²
Acre (ac)
The acre is the imperial system's unit of area, defined as the area of a rectangle with sides of 66 and 660 feet. It is equal to about 0.4047 hectares.
Square kilometer (km²)
The square kilometer is a unit of area in the metric system, defined as the area of a square with sides of 1 kilometer. It is equal to about 0.3861 square miles.