Acres to Hectares Converter
Type a value in acres to get it in hectares, and see the reverse conversion.
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Acres to Hectares Converter by TheCalcTools
How the Acres to Hectares Converter works
An international acre is exactly 4,046.8564224 m², or 0.4047 hectares. Farmland and plots are measured in acres in the US, UK and South Asia, and in hectares elsewhere.
To convert acres to hectares, multiply by 0.4046856422. The calculator shows the result to 6 significant figures; the conversion factor itself is exact by definition.
Quick estimate in your head: multiply acres by 0.4.
The formula
Worked example
Using the default values shown in the calculator:
| Value in acres (ac) | 10 |
|---|
- 10 ac × 0.4046856422 = 4.04686 ha.
Result:
| Hectares (ha) | 4.04686 |
|---|---|
| 1 ac in ha | 0.404686 |
| Your number read as ha, in ac | 24.7105 |
| Square metres (m²) | 40468.6 |
| Square feet (ft²) | 435600 |
Conversion table
| ac | ha |
|---|---|
| 0.25 ac | 0.101171 ha |
| 0.5 ac | 0.202343 ha |
| 1 ac | 0.404686 ha |
| 2 ac | 0.809371 ha |
| 5 ac | 2.02343 ha |
| 10 ac | 4.04686 ha |
| 20 ac | 8.09371 ha |
| 50 ac | 20.2343 ha |
| 100 ac | 40.4686 ha |
| 640 ac | 258.999 ha |
Frequently asked questions
What is 1 acre in hectares?
1 acre (ac) equals 0.404686 ha.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.