📏 Square kilometers to Acres Converter
Convert square kilometers (km²) to acres (ac) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 square kilometer (km²) = 247.10538 acres (ac). Formula: ac = km² × 247.10538.
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Square kilometers to Acres Converter inputs
Result
Square kilometers to Acres conversion table
| Square kilometers (km²) | Acres (ac) |
|---|---|
| 0.1 km² | 24.710538 ac |
| 0.5 km² | 123.55269 ac |
| 1 km² | 247.10538 ac |
| 2 km² | 494.21076 ac |
| 3 km² | 741.31614 ac |
| 5 km² | 1,235.5269 ac |
| 10 km² | 2,471.0538 ac |
| 20 km² | 4,942.1076 ac |
| 25 km² | 6,177.6345 ac |
| 50 km² | 12,355.269 ac |
| 100 km² | 24,710.538 ac |
| 1,000 km² | 247,105.38 ac |
Other area conversions
How to convert square kilometers to acres
Multiply the number of square kilometers by 247.10538 to get acres: ac = km² × 247.10538.
Example: 5 km² = 1,235.5269 ac.
The square kilometer (km²) and the acre (ac) are both units of area. Need the opposite direction? Use the ac to km² converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many acres are in a square kilometer?
1 square kilometer = 247.10538 acres.
How do I convert square kilometers to acres?
Use the formula ac = km² × 247.10538. For example, 5 km² = 1,235.5269 ac.
How do I convert acres back to square kilometers?
1 acre = 0.0040468564 square kilometers. Use the ac to km² converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.