One acre is exactly 0.40468564224 hectares, so an acre is a little over four tenths of a hectare. To convert, multiply the number of acres by 0.40468564224, or by about 0.4047 for everyday use. This is the direction you need when land was measured or sold in acres but has to be reported in metric: a US or UK farmer filling in an international form, a buyer comparing a listing with farmland abroad, or anyone whose acreage figure must sit next to hectare-based statistics.
Formula
Acres to Hectares conversion table
| Acres | Hectares |
|---|---|
| 0.25 ac | 0.101171 ha |
| 0.5 ac | 0.202343 ha |
| 1 ac | 0.404686 ha |
| 2 ac | 0.809371 ha |
| 3 ac | 1.2141 ha |
| 4 ac | 1.6187 ha |
| 5 ac | 2.0234 ha |
| 6 ac | 2.4281 ha |
| 7 ac | 2.8328 ha |
| 8 ac | 3.2375 ha |
| 9 ac | 3.6422 ha |
| 10 ac | 4.0469 ha |
| 15 ac | 6.0703 ha |
| 20 ac | 8.0937 ha |
| 25 ac | 10.1171 ha |
| 30 ac | 12.1406 ha |
| 40 ac | 16.1874 ha |
| 50 ac | 20.2343 ha |
| 60 ac | 24.2811 ha |
| 70 ac | 28.328 ha |
| 75 ac | 30.3514 ha |
| 80 ac | 32.3749 ha |
| 90 ac | 36.4217 ha |
| 100 ac | 40.4686 ha |
| 250 ac | 101.1714 ha |
| 500 ac | 202.3428 ha |
| 1,000 ac | 404.6856 ha |
Where you’ll use it
Acres still dominate land descriptions in the United States, and they remain common on farms and in rural listings in the UK and Canada. Hectares are the unit of agricultural statistics, crop yields, environmental reports and most land registries elsewhere. A US quarter section of 160 acres is about 64.75 hectares; a 40-acre field is about 16.19 hectares. Yield figures need the same care: a crop quoted per acre has to be divided by 0.4047 to give a per-hectare figure, because the hectare is the larger area.
Tip: Multiplying by 0.4 is a handy mental shortcut, but it reads about 1.2% low. On 100 acres that is 40 hectares instead of about 40.47. For anything written down, use the full factor and round the result, not the factor.