Square Kilometers to Acres Converter

One square kilometre is about 247.1 acres. City areas, national parks and farms are compared this way between metric and U.S. sources.

How to use the Square Kilometers to Acres Converter

1. Type the number of square kilometres into the Square kilometres field. Decimals such as 0.5 are fine.
2. Read the answer in Acres – it updates as you type, with no button to press.
3. To convert the other way, type into Acres and the square kilometres are recalculated.
4. Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.

This page converts only km² ⇄ acre. Need a different unit? Use the general area converter, where you can choose any “from” and “to” unit.

How it works

Both units measure area, so they are always in the same ratio: one square kilometre equals 247.10538 acres. The calculator multiplies the number of square kilometres you type by 247.10538 to give acres, and when you type into the acres field it divides by the same factor to give square kilometres. Because the ratio never changes, doubling the square kilometres always doubles the acres. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

How to convert square kilometres to acres

1. Write down the value in square kilometres, for example 1 km².
2. Multiply by the conversion factor 247.10538 (because 1 square kilometre = 247.10538 acre).
3. 1 × 247.10538 = 247.10538 acre.
4. To go back from acres to square kilometres, divide by 247.10538 – or multiply by 0.0040468564.

km² to acre conversion table

What is a square kilometre?

A square kilometre is a million square metres, or 100 hectares. Areas of cities, countries, lakes and national parks are reported in km².

What is an acre?

An acre is exactly 43,560 square feet, about 4,047 m². Historically it was the land a team of oxen could plough in a day. It remains the land unit in the U.S. and UK.

Quick mental conversion

For a fast estimate, multiply square kilometres by about 250 to get acres; the error is about 1.2%. Use the calculator above when you need the exact figure.

Common mistakes to avoid

Converting area with a length factor (1 m = 3.28 ft, but 1 m² = 10.76 ft², not 3.28 ft²), and assuming regional land units such as marla, bigha or katha have one standard size everywhere.