Hectares to Acres (ha to ac)
A hectare is exactly 10,000 m² (a 100 m × 100 m square), and the international acre is exactly 4,046.8564224 m² (NIST SP 811, from the 1959 international foot). So 1 hectare = 10,000 ÷ 4,046.8564224 = 2.471054 acres. Multiply by 2.47 — or by 2.5 for a quick estimate.
Formula
acres = hectares × 2.471054
Example: 0.714 hectares = 1.76433 acres.
Hectares to Acres chart
| hectares | acres |
|---|---|
| 0.1 | 0.247105 |
| 0.25 | 0.617763 |
| 0.5 | 1.23553 |
| 0.714 | 1.76433 |
| 1 | 2.47105 |
| 2 | 4.94211 |
| 2.5 | 6.17763 |
| 5 | 12.3553 |
| 10 | 24.7105 |
| 20 | 49.4211 |
| 25 | 61.7763 |
| 40 | 98.8422 |
| 50 | 123.553 |
| 100 | 247.105 |
| 250 | 617.763 |
| 500 | 1,235.53 |
| 1,000 | 2,471.05 |
Good to know
Farmland and property: land abroad is usually listed in hectares. A 40 ha farm is 98.8 acres, a 250 ha estate is 617.8 acres, and 1 km² — 100 hectares — is 247.1 acres.
Sports fields: a FIFA-size soccer pitch of 105 m × 68 m is 0.714 ha, or 1.76 acres. An American football field including end zones is 1.32 acres, about 0.535 ha.
Survey acres: the US survey foot was retired at the end of 2022 (NIST and NOAA). Older US records in survey acres (4,046.8726 m²) differ from the international acre by only 4 parts per million — 0.0004 acres per 100 acres.
Frequently asked questions
How many acres is 1 hectare?
1 hectare is 2.471054 acres.
How many acres is 10 hectares?
10 hectares is 24.71 acres.
Which is bigger, a hectare or an acre?
A hectare. It is about 2.47 times the size of an acre; one acre is 0.404686 hectares.
How many hectares is 100 acres?
100 acres is 40.47 hectares.