Convert acres to square metres

One acre is 4046.85642 square metres. To convert any amount, multiply by 4046.85642. Going the other way, one square metre is 0.000247105381 acres.

Multiply the acre figure by 4046.85642. So m² = acre × 4046.85642. For a quick mental estimate, multiplying by about 4047 gets you within a percent or so, which is close enough for most everyday purposes.

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.

One square metre is a generous doormat, or a small dining table. The square metre is the standard unit for floor area in property listings across the metric world, and increasingly in commercial listings even in the US.

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 acre before converting introduces an error the conversion then multiplies.