acre (ac)
1 acre = 4,046.8564224 square metres
What is acre?
An acre is a unit of area in imperial and US customary systems equal to 43,560 square feet. It is the standard unit for measuring agricultural land, property lots, and parks in the United States and United Kingdom.
Notes: Land area unit
Real-world uses
Acres are used for land parcels, farm sizes, and real estate in the US, UK, and some Commonwealth countries. Zoning laws often specify minimum lot sizes in acres. An American football field (including end zones) is about 1.32 acres.
History
The acre originated in medieval England as the amount of land a yoke of oxen could plough in one day. The word comes from Old English "æcer." It was standardized as a strip 1 furlong (660 ft) by 1 chain (66 ft), yielding 43,560 square feet.
Common mistakes
Assuming an acre is a square measure with specific dimensions—it is 43,560 sq ft but can be any shape. Also, confusing acres with hectares: 1 acre ≈ 0.405 hectares, so roughly 2.5 acres make one hectare.
When is this conversion used?
Converting between acre and square metre is common when working across metric and imperial systems, such as international trade, travel between countries with different measurement standards, or following instructions from a different region.
How to convert acre to square metre
To convert acre to square metre, multiply the value by 4,046.8564224.
Conversion formula (from base unit)
x * 4046.8564224
Measurement standards
The square metre is the SI derived unit of area. The hectare (10,000 m²) is accepted for use with the SI by the BIPM, particularly for land measurement, though it is not an SI unit itself.
Did you know?
Vatican City, the world's smallest independent state, covers just 0.44 km² (about 109 acres) — smaller than many golf courses. By contrast, Russia spans over 17.1 million km², nearly 39 million times larger.
| acres | square metres |
|---|---|
| 0.1 | 404.68564224 |
| 0.5 | 2,023.4282112 |
| 1 | 4,046.8564224 |
| 2 | 8,093.7128448 |
| 5 | 20,234.282112 |
| 10 | 40,468.564224 |
| 25 | 101,171.41056 |
| 50 | 202,342.82112 |
| 100 | 404,685.64224 |
| 250 | 1,011,714.1056 |
| 500 | 2,023,428.2112 |
| 1,000 | 4,046,856.4224 |
Common values
| acres | square metres | |
|---|---|---|
| A4 paper | 0.00001532 acres | 0.062 square metres |
| Parking space | 0.00308882 acres | 12.5 square metres |
| Tennis court | 0.06446238 acres | 260.87 square metres |
| Football field (soccer) | 1.76433242 acres | 7,140 square metres |
| Central Park, NYC | 842.6293508 acres | 3,410,000 square metres |
Full acre conversion table
| Unit | Value | Factor |
|---|---|---|
| square metre | 1 ac = 4,046.8564224 m² | × 4,046.8564224 |
| square kilometre | 1 ac = 0.00404686 km² | × 0.00404686 |
| square foot | 1 ac = 43,560 ft² | × 43,560 |
| square mile | 1 ac = 0.0015625 mi² | × 0.0015625 |
| hectare | 1 ac = 0.40468564 ha | × 0.40468564 |
| square centimetre | 1 ac = 40,468,564.224 cm² | × 40,468,564.224 |
| square inch | 1 ac = 6,272,640 in² | × 6,272,640 |
| square yard | 1 ac = 4,840 yd² | × 4,840 |
| are | 1 ac = 40.46856422 a | × 40.46856422 |