Square Kilometers to Acres (km² to ac) Converter
1 square kilometer equals 247.105381 acres — multiply the number of square kilometers by 247.105381 to convert. This is an exact area conversion, so 5 km² is 1,235.526905 acres and 10 km² is 2,471.05381 acres.
The formula
To convert square kilometers to acres, multiply by the fixed factor 247.105381:
acres = square kilometers × 247.105381
For example, 3 km² × 247.105381 = 741.316143 ac. To reverse the calculation, divide acres by 247.105381 (or multiply by 0.00404686).
Conversion table
| Square kilometers (km²) | Acres (ac) |
|---|---|
| 1 | 247.105381 |
| 2 | 494.210762 |
| 5 | 1,235.526905 |
| 10 | 2,471.05381 |
| 25 | 6,177.634525 |
| 50 | 12,355.26905 |
| 100 | 24,710.5381 |
| 500 | 123,552.6905 |
| 1000 | 247,105.381 |
How to convert online
Converting takes seconds:
- Type the number of square kilometers into the first box.
- Read the acre value instantly in the second box.
- Or enter an acre value to convert back to square kilometers — it works both ways.
Use the Square Kilometer to Acre Converter — free and instant in your browser.
Where this conversion is used
Square kilometers are the standard metric unit for large areas — cities, farmland, national parks and map regions — while the acre remains the everyday unit for land and real estate in the US and UK. Converting km² to acres is common when comparing property listings, planning agricultural plots, assessing conservation land, or translating survey data between metric and imperial systems.
FAQ
How many acres are in a square kilometer?
One square kilometer equals 247.105381 acres. Multiply your km² value by 247.105381 — for example, 10 km² = 2,471.05381 acres.
What is the formula to convert square kilometers to acres?
Acres = km² × 247.105381. The converter applies this exact factor automatically so you never round by hand.
How do I convert acres back to square kilometers?
Divide the acre value by 247.105381, or multiply by 0.00404686. So 640 acres ≈ 0.259 km².
Is the conversion exact?
Yes. 247.105381 is the internationally accepted factor for square kilometers to acres, so results are precise to the digits shown.
Related converters
- Acre to Square Kilometer Converter
- Square Kilometer to Square Meter Converter
- Square Kilometer to Square Foot Converter
- Square Kilometer to Hectare Converter
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