Convert square kilometres to acres

One square kilometre is 247.105381 acres. To convert any amount, multiply by 247.105381. Going the other way, one acre is 0.00404685642 square kilometres.

Multiply the square kilometre figure by 247.105381. So acre = km² × 247.105381. For a quick mental estimate, multiplying by about 247 gets you within a percent or so, which is close enough for most everyday purposes.

One square kilometre is a medium city park. The square kilometre is the standard unit for reporting the area of cities, parks and countries in the metric world.

One acre is roughly a football pitch without the ends. The acre was originally the area one man with one ox could plough in a day. It is exactly 4,840 square yards, and is still the standard unit for land in the US, UK and Canada.

Yes. Since the 1959 international yard and pound agreement, the imperial and metric systems are related by exact definitions rather than measurements — the inch is exactly 25.4 mm and the pound exactly 0.45359237 kg. Everything derived from those, including this conversion, is therefore exact. Round at the end rather than partway through, since rounding km² before converting introduces an error the conversion then multiplies.