This converter turns square kilometers into acres instantly, using the exact factor 1 square kilometer = 247.1053815 acres. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
One million square metres — the unit for cities, lakes and districts. Originally the area one ox team could plough in a day; now exactly 4,046.86 m².
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
square kilometers- The amount you are converting, measured in square kilometers
247.1053815- The exact number of acres in one square kilometer
acres- The converted result
How it works, step by step
- Enter the number of square kilometers you want to convert.
- The value is multiplied by 247.1053815, the exact conversion factor.
- The result is displayed in acres, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 square kilometers
Multiply 5 by 247.10538. That gives 1,235.53 acres. A quick sanity check: one square kilometer is larger than one acre, so the number should get bigger — and it does.
Converting 72 square kilometers
72 × 247.10538 = 17,791.59 acres. Working backwards, 17,791.59 ÷ 247.10538 returns 72 square kilometers, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many acres are in one square kilometer?
Exactly 247.1053815. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert square kilometers to acres?
Acres = square kilometers × 247.1053815. To reverse it, divide instead: square kilometers = acres ÷ 247.1053815, which is the same as multiplying by 0.004046856422.
Is the square kilometer bigger than the acre?
Yes. One square kilometer equals 247.105 acres, so it is the larger unit.
Why does my answer differ slightly from other square-kilometers to acres converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a square kilometer?
One million square metres — the unit for cities, lakes and districts.
What is a acre?
Originally the area one ox team could plough in a day; now exactly 4,046.86 m².
Square Kilometers to acres reference table
| Square Kilometers | Acres |
|---|---|
| 0.5 km² | 123.5527 ac |
| 1 km² | 247.1054 ac |
| 2 km² | 494.2108 ac |
| 3 km² | 741.3161 ac |
| 5 km² | 1,235.53 ac |
| 10 km² | 2,471.05 ac |
| 15 km² | 3,706.58 ac |
| 20 km² | 4,942.11 ac |
| 25 km² | 6,177.63 ac |
| 50 km² | 12,355.27 ac |
| 75 km² | 18,532.9 ac |
| 100 km² | 24,710.54 ac |
| 250 km² | 61,776.35 ac |
| 500 km² | 123,552.69 ac |
| 1000 km² | 247,105.38 ac |
Exact factor: 1 square kilometer = 247.1053815 acres. Values rounded for display.