Convert square feet to acres

One square foot is 0.0000229568411 acres. To convert any amount, multiply by 0.0000229568411. Going the other way, one acre is 43560 square feet.

Multiply the square foot figure by 0.0000229568411. So acre = ft² × 0.0000229568411. For a quick mental estimate, dividing by about 43560 gets you close enough for most everyday purposes.

One square foot is about the size of a floor tile. The square foot is exactly 0.09290304 square metres. It remains the property unit in the US, Canada, the UK and much of South Asia.

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 ft² before converting introduces an error the conversion then multiplies.