What is hectare?
A hectare is a metric unit of area equal to 10,000 square metres. It is the standard unit for measuring agricultural land, forest areas, and large parcels of real estate in metric countries.
Real-world uses
Hectares are the standard unit for agricultural land measurement, forestry management, and urban planning worldwide. Wine regions report vineyard sizes in hectares, and environmental reports quantify habitat loss in hectares. One hectare is roughly the size of two American football fields.
History
The hectare was introduced during the French Revolution as part of the metric system, originally called a "hecto-are" (100 ares). Though not an official SI unit, it is accepted for use with SI and remains the predominant land area unit in global agriculture.
Common mistakes
Confusing hectares with acres—1 hectare is about 2.47 acres, not 1-to-1. Also, some people confuse "hectare" with "hectometre," but a hectare is 10,000 m² (100 m × 100 m), a unit of area, not length.
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.
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 hectare and acre 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.
Worked examples
1 hectare = 2.47105381 acre
1 acre = 4,046.8564224 square metre
How to convert hectare to acre
To convert hectare to acre, multiply the value by 2.47105381.
To convert acre back to hectare, multiply by 0.40468564.
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.
Quick reference: hectare to acre
| hectare | acre |
|---|---|
| 0.1 | 0.24710538 |
| 0.5 | 1.23552691 |
| 1 | 2.47105381 |
| 2 | 4.94210763 |
| 5 | 12.35526907 |
| 10 | 24.71053815 |
| 25 | 61.77634537 |
| 50 | 123.55269073 |
| 100 | 247.10538147 |
| 250 | 617.76345367 |
| 500 | 1,235.52690734 |
| 1,000 | 2,471.05381467 |
Common values
| hectare | acre | |
|---|---|---|
| A4 paper | 0.0000062 hectare | 0.00001532 acre |
| Parking space | 0.00125 hectare | 0.00308882 acre |
| Tennis court | 0.026087 hectare | 0.06446238 acre |
| Football field (soccer) | 0.714 hectare | 1.76433242 acre |
| Central Park, NYC | 341 hectare | 842.6293508 acre |