How to convert square kilometers to acres
ac = km² × 247.1053815Multiply the value in square kilometers by 247.1053815. To go the other way, multiply by 0.004046856422 (or divide by 247.1053815).
A square kilometer is larger than an acre: one square kilometer contains 247.1053815 acres.
Worked examples
- 1 square kilometer1 km² × 247.1053815 = 247.1053815 ac
- 5 square kilometers5 km² × 247.1053815 = 1,235.526907 ac
- 10 square kilometers10 km² × 247.1053815 = 2,471.053815 ac
- 20 square kilometers20 km² × 247.1053815 = 4,942.107629 ac
- 100 square kilometers100 km² × 247.1053815 = 24,710.53815 ac
Square kilometers to acres conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Square kilometers (km²) | Acres (ac) |
|---|---|
| 0.1 km² | 24.710538 ac |
| 0.25 km² | 61.776345 ac |
| 0.5 km² | 123.55269 ac |
| 1 km² | 247.10538 ac |
| 2 km² | 494.21076 ac |
| 3 km² | 741.31614 ac |
| 4 km² | 988.42153 ac |
| 5 km² | 1,235.5269 ac |
| 6 km² | 1,482.6323 ac |
| 7 km² | 1,729.7377 ac |
| 8 km² | 1,976.8431 ac |
| 9 km² | 2,223.9484 ac |
| 10 km² | 2,471.0538 ac |
| Square kilometers (km²) | Acres (ac) |
|---|---|
| 12 km² | 2,965.2646 ac |
| 15 km² | 3,706.5807 ac |
| 20 km² | 4,942.1076 ac |
| 25 km² | 6,177.6345 ac |
| 30 km² | 7,413.1614 ac |
| 40 km² | 9,884.2153 ac |
| 50 km² | 12,355.269 ac |
| 75 km² | 18,532.904 ac |
| 100 km² | 24,710.538 ac |
| 250 km² | 61,776.345 ac |
| 500 km² | 123,552.69 ac |
| 1,000 km² | 247,105.38 ac |
About the units
Square kilometer (km²)
One million square metres or 100 hectares; used for city, lake and country areas. One square kilometer equals 1,000,000 square meters (m²).
Acre (ac)
43,560 ft² (4,046.8564224 m²). Historically the land one ox team could plough in a day; still the US and UK unit for land parcels.
Frequently asked questions
How many acres are in one square kilometer?
There are 247.1053815 acres in one square kilometer, and this value is exact by definition.
How do I convert square kilometers to acres?
Multiply the number of square kilometers by 247.1053815. For example, 10 km² × 247.1053815 = 2,471.053815 ac.
How many square kilometers are in one acre?
One acre equals 0.004046856422 square kilometers. That is the reverse factor, 1 ÷ 247.1053815.
What is 10 square kilometers in acres?
10 km² = 2,471.053815 ac.
Is this km² to ac converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.