An acre is exactly 4,046.8564224 square meters, 43,560 square feet or 0.4047 hectares. Type an area above in any unit – acres, m², ft², yd², hectares, ares, km² or square miles – and you get it in all the others.
Acres to square meters and hectares
| Acres | Square meters | Square feet | Hectares |
|---|---|---|---|
| 0.1 | 404.69 | 4,356 | 0.0405 |
| 0.25 | 1,011.71 | 10,890 | 0.1012 |
| 0.5 | 2,023.43 | 21,780 | 0.2023 |
| 1 | 4,046.86 | 43,560 | 0.4047 |
| 2 | 8,093.71 | 87,120 | 0.8094 |
| 5 | 20,234.28 | 217,800 | 2.0234 |
| 10 | 40,468.56 | 435,600 | 4.0469 |
| 40 | 161,874.26 | 1,742,400 | 16.1874 |
| 100 | 404,685.64 | 4,356,000 | 40.4686 |
| 640 (1 square mile) | 2,589,988.11 | 27,878,400 | 258.9988 |
Hectares and square meters to acres
| Area | Acres |
|---|---|
| 1,000 m² | 0.2471 |
| 5,000 m² | 1.2355 |
| 1 hectare (10,000 m²) | 2.471 |
| 2 hectares | 4.942 |
| 5 hectares | 12.355 |
| 10 hectares | 24.711 |
| 100 hectares (1 km²) | 247.105 |
How big is an acre?
- An American football field without the end zones (300 × 160 ft) is 48,000 ft², about 1.10 acres; with the end zones, 1.32 acres.
- A soccer pitch of 105 × 68 m, the size used for international matches, is 7,140 m², about 1.76 acres.
- A square acre is 208.7 ft (63.6 m) on each side.
- A “quarter-acre lot”, a common size for a house plot in the US and Australia, is 10,890 ft² or 1,012 m².
Where acres and hectares are used
Acres are used for land in the United States, the United Kingdom (alongside hectares), Canada and parts of South Asia, among others. Most of the world uses hectares for land and m² for plots and homes. In land listings, a price per acre converts to a price per hectare by multiplying by 2.471.
The old definition
In medieval England an acre was the land a team of oxen could plow in a day: a strip one furlong (220 yards) long and one chain (22 yards) wide – 4,840 square yards. The international yard of 1959 fixed the yard at 0.9144 m, which makes the acre exactly 4,046.8564224 m² today.
For the area of a plot from its sides, use the square footage calculator. Once zet4u is saved on your device, the converter works offline – out on the land, too.
Frequently asked questions
How many square meters are in an acre?
4,046.8564224 exactly – an acre is defined as 4,840 square yards, and a yard is exactly 0.9144 m. Rounded, 4,047 m²; roughly 4,000 m² for a quick estimate.
How many acres are in a hectare?
2.471. A hectare is 10,000 m² (100 × 100 m), so it is about two and a half acres; an acre is 0.405 hectares.
How many square feet are in an acre?
43,560. A square acre would be about 208.7 ft (63.6 m) on each side. The acre was never meant to be square: its old form was a strip one furlong (660 ft) long and one chain (66 ft) wide.
Is the US survey acre different?
Slightly. It was based on the US survey foot, 2 parts per million longer than the international foot, so a survey acre was about 4,046.873 m² – 0.0004% more. The US retired the survey foot at the end of 2022; old deeds and maps may still use it, but the difference only matters for very large surveys.
Sources
- NIST Special Publication 811: Guide for the Use of the SI, Appendix B (acre, square yard)
- NIST: Ending the era of the US survey foot (last day of use: December 31, 2022)
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