Hectares to acres
One ha equals 2.471053815 ac. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
- Free
- Files never leave your device
- No sign-up
Common values
| hectares | acres |
|---|---|
| 1 ha | 2.4710538 ac |
| 2 ha | 4.9421076 ac |
| 3 ha | 7.4131614 ac |
| 5 ha | 12.355269 ac |
| 10 ha | 24.710538 ac |
| 15 ha | 37.065807 ac |
| 20 ha | 49.421076 ac |
| 25 ha | 61.776345 ac |
| 50 ha | 123.55269 ac |
| 100 ha | 247.10538 ac |
| 500 ha | 1235.5269 ac |
| 1000 ha | 2471.0538 ac |
How to use
- Enter the number of hectares in the field.
- The result in acres updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: ac = ha × 2.471053815. Going back the other way, one ac is 0.4046856422 ha.
Where the odd number comes from
The factor is not a round number because the imperial units are defined through the metric ones by international agreement: an inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Everything else follows from those definitions.
ac = ha × 2.471053815
Frequently asked questions
How many acres are in one hectares?
One ha is 2.471053815 ac.
How do I convert hectares to acres?
Multiply by the factor: ac = ha × 2.471053815.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert acres back to hectares?
One ac is 0.4046856422 ha — or open the reverse page linked below.