This converter turns square kilometers into ares instantly, using the exact factor 1 square kilometer = 10000 ares. 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. One hundred square metres — a hundredth of a hectare, common in European land records.
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
10000- The exact number of ares in one square kilometer
ares- The converted result
How it works, step by step
- Enter the number of square kilometers you want to convert.
- The value is multiplied by 10000, the exact conversion factor.
- The result is displayed in ares, 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 10000. That gives 50,000 ares. A quick sanity check: one square kilometer is larger than one are, so the number should get bigger — and it does.
Converting 72 square kilometers
72 × 10000 = 720,000 ares. Working backwards, 720,000 ÷ 10000 returns 72 square kilometers, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many ares are in one square kilometer?
Exactly 10000. 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 ares?
Ares = square kilometers × 10000. To reverse it, divide instead: square kilometers = ares ÷ 10000, which is the same as multiplying by 0.0001.
Is the square kilometer bigger than the are?
Yes. One square kilometer equals 10000 ares, so it is the larger unit.
Why does my answer differ slightly from other square-kilometers to ares 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 are?
One hundred square metres — a hundredth of a hectare, common in European land records.
Square Kilometers to ares reference table
| Square Kilometers | Ares |
|---|---|
| 0.5 km² | 5,000 a |
| 1 km² | 10,000 a |
| 2 km² | 20,000 a |
| 3 km² | 30,000 a |
| 5 km² | 50,000 a |
| 10 km² | 100,000 a |
| 15 km² | 150,000 a |
| 20 km² | 200,000 a |
| 25 km² | 250,000 a |
| 50 km² | 500,000 a |
| 75 km² | 750,000 a |
| 100 km² | 1,000,000 a |
| 250 km² | 2,500,000 a |
| 500 km² | 5,000,000 a |
| 1000 km² | 10,000,000 a |
Exact factor: 1 square kilometer = 10000 ares. Values rounded for display.