Convert acres to square kilometers
Acre (ac) to square kilometer (km²). One acre equals 0.004047 square kilometers.
Formula
Acre to square kilometer conversion table
| Acres | Square kilometers | Square kilometers | Acres |
|---|---|---|---|
| 1 ac | 0.004047 km² | 1 km² | 247.11 ac |
| 2 ac | 0.008094 km² | 2 km² | 494.21 ac |
| 3 ac | 0.012141 km² | 3 km² | 741.32 ac |
| 5 ac | 0.020234 km² | 5 km² | 1235.53 ac |
| 10 ac | 0.040469 km² | 10 km² | 2471.05 ac |
| 20 ac | 0.080937 km² | 20 km² | 4942.11 ac |
| 50 ac | 0.202343 km² | 50 km² | 12355.27 ac |
| 100 ac | 0.404686 km² | 100 km² | 24710.54 ac |
| 500 ac | 2.0234 km² | 500 km² | 123552.69 ac |
| 1000 ac | 4.0469 km² | 1000 km² | 247105.38 ac |
To convert acres to square kilometers, divide the number of acres by 247.11. One acre equals 0.004047 square kilometers, and one square kilometer equals 247.11 acres, so the relationship is fixed and exact. As a worked example, 10 ac comes to 0.040469 km². Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a area conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common acre values already worked out in square kilometers, plus the reverse square kilometer to acre direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many square kilometers are in an acre?
One acre equals 0.004047 square kilometers. The ratio is constant, so you can multiply any number of acres by 0.004047 to get square kilometers.
What is the formula to convert acres to square kilometers?
Use square kilometers = acres ÷ 247.11. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert square kilometers back to acres?
Go the other way by using one square kilometer equals 247.11 acres. You can also press the swap button in the converter above to flip the direction in one click.
Is this acre to square kilometer converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.