Convert acres to hectares

One acre is 0.404685642 hectares. To convert any amount, multiply by 0.404685642. Going the other way, one hectare is 2.47105381 acres.

Multiply the acre figure by 0.404685642. So ha = acre × 0.404685642. For a quick mental estimate, dividing by about 2.47 gets you 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 hectare is about two and a half acres. A hectare is exactly 10,000 square metres — a square 100 m on a side — and is the standard agricultural land unit in the metric world.

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.