Acres to hectares (ac to ha)
The answer, the exact formula and a table with the values people look up most.
1 ac = 0.404686 ha1 ha = 2.47105 acHectares = Acres × 0.40468564224Example: 10 ac = 4.04686 ha
1 acre = 0.4046856422 ha
Conversions people ask for most
Convert acres to hectares
| ac | ha |
|---|---|
| 0.1 ac | 0.040469 ha |
| 0.25 ac | 0.10117 ha |
| 0.5 ac | 0.20234 ha |
| 1 ac | 0.40469 ha |
| 2 ac | 0.80937 ha |
| 3 ac | 1.2141 ha |
| 5 ac | 2.0234 ha |
| 10 ac | 4.0469 ha |
| 20 ac | 8.0937 ha |
| 40 ac | 16.187 ha |
| 50 ac | 20.234 ha |
| 100 ac | 40.469 ha |
| 640 ac | 259 ha |
| 1000 ac | 404.69 ha |
The factor is exact: it comes from the official definition of the units. The table rounds to a few decimals; the converter above gives up to 10 significant digits.
The two units
Acre ac
An acre is 43,560 square feet, about 4,047 m² or 0.405 hectares; land in the US and the UK is sold by the acre.
Hectare ha
A hectare is 10,000 square meters (a square 100 m on each side); it is the usual unit for farmland.
Frequently asked questions
How many hectares are 10 acres?
10 ac = 4.04686 ha.
What is the formula to convert acres to hectares?
Hectares = Acres × 0.40468564224. 10 ac = 4.04686 ha.
Is this conversion exact?
Yes. The factor comes from the international definition of both units, so the only difference you may see is rounding.