Hectares to Acres Converter (ha to ac)
Convert hectares to acres instantly. 1 ha = 2.471 ac. Includes the formula, a full conversion table and a calculator that works offline.
The formula
To convert hectares to acres, multiply by 2.471:
ac = ha × 2.471Going the other way, divide instead — or multiply by 0.4047, which is the same thing:
ha = ac × 0.4047Hectares to Acres conversion table
| Hectares | Acres |
|---|---|
| 1 ha | 2.471 ac |
| 2 ha | 4.942 ac |
| 3 ha | 7.413 ac |
| 4 ha | 9.884 ac |
| 5 ha | 12.355 ac |
| 6 ha | 14.826 ac |
| 7 ha | 17.297 ac |
| 8 ha | 19.768 ac |
| 9 ha | 22.239 ac |
| 10 ha | 24.711 ac |
| 15 ha | 37.066 ac |
| 20 ha | 49.421 ac |
| 25 ha | 61.776 ac |
| 30 ha | 74.132 ac |
| 40 ha | 98.842 ac |
| 50 ha | 123.55 ac |
| 75 ha | 185.33 ac |
| 100 ha | 247.11 ac |
| 250 ha | 617.76 ac |
| 500 ha | 1,235.53 ac |
| 1000 ha | 2,471.05 ac |
Acres to Hectares
| Acres | Hectares |
|---|---|
| 1 ac | 0.4047 ha |
| 2 ac | 0.8094 ha |
| 3 ac | 1.214 ha |
| 4 ac | 1.619 ha |
| 5 ac | 2.023 ha |
| 6 ac | 2.428 ha |
| 7 ac | 2.833 ha |
| 8 ac | 3.237 ha |
| 9 ac | 3.642 ha |
| 10 ac | 4.047 ha |
What that actually looks like
A conversion factor is hard to judge on its own. These are quantities most people already have a feel for, converted for you:
- A football pitch is about 0.7 hectares — 1.73 ac
- Central Park is 341 hectares — 842.63 ac
Why both units are still in use
Area conversions turn up mostly in property listings and land. Homes are advertised in square feet in the US and India, in square metres across most of Europe, and in both in the UK depending on the agent. Land is measured in acres or hectares, which is a separate pair of units again.
Mistakes worth avoiding
Square units do not scale the way linear ones do. A square metre is not 3.28 square feet — it is 3.28 squared, which is 10.76. Doubling a room's dimensions quadruples its area, and forgetting that is how flooring gets ordered short.
The other habit worth breaking is rounding too early. Convert first, round once at the end, and you avoid the drift that turns a small approximation into a visible error by the third calculation.
Doing it in your head
When you only need a rough answer, double it, then add another 25 percent — which lands within 1.2 percent of the true value. Ten hectares works out at roughly 25 acres that way, against 24.711 exactly. An estimate is enough for deciding whether something will fit or whether a figure sounds plausible. When the number has to be right — because you are buying, cooking or building to it — use the calculator and let it carry the decimals.
Common questions
How many acres are in one hectare?
One hectare equals 2.471 acres. The calculator above handles any value, including decimals and very large numbers, and updates as you type.
Is this an exact conversion?
The factor is accurate to the precision shown, which is far beyond what any practical measurement requires. The table rounds for readability; the calculator does not.
Does this work offline?
Yes. The conversion runs in your browser with no network request, so it works on a plane, in a basement, or on a phone with no signal once the page has loaded.