ac
Definition
The acre equals 4046.86 square metres — originally the area a team of oxen could plough in a day. It is the standard rural land unit in the US, UK and Canada. Suburban American lots are typically a quarter to half an acre. 640 acres equal one square mile.
Common uses
- US farmland and ranches
- UK rural property and estates
- Canadian rural property (legal survey system)
🌍 Real-world scale
A US suburban lot is 0.25–0.5 acre. A standard UK rural property might be 5 acres. A football pitch is about 1.8 acres.
Convert from acres
11 conversionsAcre to Square Meter1 ac = 4,046.86 m²Acre to Square Kilometer1 ac = 0.004047 km²Acre to Square Centimeter1 ac = 40,468,564.22 cm²Acre to Square Millimeter1 ac = 4,046,856,422.4 mm²Acre to Hectare1 ac = 0.4047 haAcre to Square Foot1 ac = 43,560 ft²Acre to Square Inch1 ac = 6,272,640 in²Acre to Square Yard1 ac = 4,840 yd²Acre to Square Mile1 ac = 0.001563 mi²Acre to Rai1 ac = 2.52929 raiAcre to Dunam1 ac = 4.04686 dunam
Convert to acres
11 conversionsSquare Meter to Acre1 m² = 0.0002471 acSquare Kilometer to Acre1 km² = 247.105 acSquare Centimeter to Acre1 cm² = 2.4711e-8 acSquare Millimeter to Acre1 mm² = 2.4711e-10 acHectare to Acre1 ha = 2.47105 acSquare Foot to Acre1 ft² = 2.2957e-5 acSquare Inch to Acre1 in² = 1.5942e-7 acSquare Yard to Acre1 yd² = 0.0002066 acSquare Mile to Acre1 mi² = 640 acRai to Acre1 rai = 0.3954 acDunam to Acre1 dunam = 0.2471 ac
Tips
- 1 acre = 43,560 ft² = 0.4047 ha.
- 640 acres = 1 square mile — a "section" in US land survey.
- An acre is 43,560 ft² — a useful number for US real-estate calculations.
Common mistakes
- Using "acre" in modern European property — use hectares or m² instead.
- Assuming an acre is a specific shape — it is only an area (any shape).
- Multiplying acres by 4000 m² — correct value is 4046.86.
FAQ about the acre
Explore all 12 area units and their conversions.🗺️ Area hub →