Acres to Square Kilometers
Convert acres (ac) to square kilometers (km²). Type in either box; the other updates as you go.
How to convert acres to square kilometers
To convert acres to square kilometers, multiply the number of acres by 0.004046856422.
Example
Convert 5 acres to square kilometers:
Acre to square kilometer conversion chart
| Acres (ac) | Square Kilometers (km²) |
|---|---|
| 1 ac | 0.004046856 km² |
| 2 ac | 0.008093713 km² |
| 3 ac | 0.01214057 km² |
| 4 ac | 0.01618743 km² |
| 5 ac | 0.02023428 km² |
| 6 ac | 0.02428114 km² |
| 7 ac | 0.02832799 km² |
| 8 ac | 0.03237485 km² |
| 9 ac | 0.03642171 km² |
| 10 ac | 0.04046856 km² |
| 12 ac | 0.04856228 km² |
| 15 ac | 0.06070285 km² |
| 20 ac | 0.08093713 km² |
| 25 ac | 0.1011714 km² |
| 30 ac | 0.1214057 km² |
| 40 ac | 0.1618743 km² |
| 50 ac | 0.2023428 km² |
| 60 ac | 0.2428114 km² |
| 70 ac | 0.2832799 km² |
| 75 ac | 0.3035142 km² |
| 80 ac | 0.3237485 km² |
| 90 ac | 0.3642171 km² |
| 100 ac | 0.4046856 km² |
| 150 ac | 0.6070285 km² |
| 200 ac | 0.8093713 km² |
| 250 ac | 1.011714 km² |
| 500 ac | 2.023428 km² |
| 1,000 ac | 4.046856 km² |
Going the other way? See the square kilometers to acres chart.
About the units
Acre (ac)
An acre is 43,560 square feet, about 4,047 square meters. US and UK land is measured in acres.
Square Kilometer (km²)
A square kilometer is 1,000,000 square meters, or 100 hectares. The size of cities and countries is given in square kilometers.
Frequently asked questions
How many square kilometers are in an acre?
There are 0.004046856422 square kilometers in an acre.
How many acres are in a square kilometer?
There are 247.1053815 acres in a square kilometer.
How do you convert acres to square kilometers?
To convert acres to square kilometers, multiply the number of acres by 0.004046856422.
What is 5 acres in square kilometers?
5 acres equals 0.0202343 square kilometers.
Convert between square feet, square meters, acres, hectares and other units of area. Open the area converter to see a value in every unit at once.