Convert square kilometers to acres
Converting square kilometers to acres is a common area task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 km² equals 247.105 ac, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert square kilometers to acres
To convert square kilometers to acres, multiply the number of square kilometers by 247.105. For example, 10 km² × 247.105 = 2,471.05 ac.
ac = km² × 247.105
- Write down the value in square kilometers you want to convert.
- Multiply it by 247.105 (the exact km²→ac factor).
- The result is your value in acres. Check it below with the converter or the table.
Conversion table
Common values of square kilometers and their equivalents in acres:
| km² | ac |
|---|---|
| 1 | 247.105 |
| 2 | 494.211 |
| 3 | 741.316 |
| 4 | 988.422 |
| 5 | 1,235.53 |
| 10 | 2,471.05 |
| 20 | 4,942.11 |
| 25 | 6,177.63 |
| 50 | 12,355.3 |
| 100 | 24,710.5 |
| 250 | 61,776.3 |
| 500 | 123,553 |
About these units
Square Kilometer (km²). A square kilometer equals one million square meters, or 100 hectares. Cities, lakes and countries are measured in square kilometers.
Acre (ac). An acre equals exactly 4,046.8564224 square meters, or 43,560 square feet. It is the traditional land unit in the US and UK, about 0.4 hectares.
Frequently asked questions
How do I convert square kilometers to acres?
To convert square kilometers to acres, multiply the number of square kilometers by 247.105. For example, 10 km² × 247.105 = 2,471.05 ac. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many acres are in 1 square kilometer?
1 km² = 247.105 ac. That is the fixed relationship used by this converter and by international standards.
How many square kilometers are in 1 acre?
1 ac = 0.00404686 km². If you are converting in the opposite direction, use our Acre to Square Kilometer converter for the dedicated table and FAQ.
Is the square kilometers to acres conversion exact?
Yes. Both units are defined by international agreement, so the factor of 247.105 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is square kilometer used for?
A square kilometer equals one million square meters, or 100 hectares. Cities, lakes and countries are measured in square kilometers.