Hectares to Acres
An instant hectares-to-acres converter, with the formula and a reference table below.
| Hectares | Acres |
|---|---|
| 1 ha | 2.471054 ac |
| 2 ha | 4.942108 ac |
| 3 ha | 7.413161 ac |
| 5 ha | 12.355269 ac |
| 10 ha | 24.710538 ac |
| 25 ha | 61.776345 ac |
| 50 ha | 123.552691 ac |
| 100 ha | 247.105381 ac |
How to use
- Enter a value in the Hectares field.
- The Acres figure appears immediately — no button to press.
- Typing in the Acres field converts back to Hectares the same way.
- Use the reference table for the values that come up most often.
Hectares to Acres formula
The factor from hectares to acres is 2.47105381.
ac = ha × 2.47105381
Why this factor: the hectare and the acre are both defined against the square meter, so dividing one definition by the other gives 2.47105381 directly. Both definitions are set out in full below.
To go the other way, divide by 2.47105381 — or use the Acres to Hectares converter, which is the same calculation reversed.
Worked example
Take 250 ha and multiply by the factor 2.47105381: the result is 617.763454 ac.
250 ha × 2.47105381 = 617.763454 ac
The converter above does this for any value you type, in either direction.
What is a hectare?
A hectare is the standard metric unit of land area — a 100-meter square.
Definition: Exactly 10,000 square meters, which is one square hectometer.
Where it is used: Agricultural and forestry land, development sites, and land-use statistics worldwide.
Worth knowing: Roughly two and a half acres, and almost exactly the area of an international rugby pitch.
What is an acre?
An acre is the customary land area unit of the US and UK, historically a day's ploughing for one team of oxen.
Definition: One chain by one furlong — 43,560 square feet — which is exactly 4,046.8564224 square meters.
Where it is used: US and UK property and farmland, development parcels, and land sales.
Worth knowing: 640 acres make one square mile, the basis of the US Public Land Survey grid.
Hectares vs Acres
The hectare is a metric unit while the acre is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many acres are in a hectare?
One hectare equals 2.47105381 acres.
What is the formula to convert hectares to acres?
Multiply the number of hectares by 2.47105381. To reverse it, divide by 2.47105381 instead.
How do I convert acres back to hectares?
Divide by 2.47105381, which is the same as multiplying by 0.404685642.
How many acres are in 10 hectares?
10 ha works out to 24.710538 ac.
Is there anything to watch out for with hectares?
Roughly two and a half acres, and almost exactly the area of an international rugby pitch.
How is the hectare defined?
Exactly 10,000 square meters, which is one square hectometer.