Hectares to Acres Converter
Land area in the four units property and agricultural listings use.
Enter a number.
Free · No sign-up · Updates as you type · Exact factor, per NIST
- 0.1 ha0.247 ac1,000 m²
- 0.25 ha0.618 ac2,500 m²
- 0.5 ha1.236 ac5,000 m²
- 1 ha2.471 ac10,000 m²
- 2 ha4.942 ac20,000 m²
- 5 ha12.355 ac50,000 m²
- 10 ha24.711 ac100,000 m²
- 20 ha49.421 ac200,000 m²
- 50 ha123.553 ac500,000 m²
The formulas
1 acre = 4,046.8564224 m² (exact)
ac = ha × 2.4710538 (rounded)
Worked example: 5 ha × 2.4710538 = 12.36 acres.
Both base definitions are exact; the hectare-to-acre ratio between them is a rounded value.
Conversion table
| Hectares | Acres | Square meters | Square feet |
|---|---|---|---|
| 0.1 ha | 0.247 | 1,000 | 10,764 |
| 0.25 ha | 0.618 | 2,500 | 26,910 |
| 0.5 ha | 1.236 | 5,000 | 53,820 |
| 1 ha | 2.471 | 10,000 | 107,639 |
| 2 ha | 4.942 | 20,000 | 215,278 |
| 5 ha | 12.355 | 50,000 | 538,196 |
| 10 ha | 24.711 | 100,000 | 1,076,391 |
| 25 ha | 61.776 | 250,000 | 2,690,978 |
| 50 ha | 123.553 | 500,000 | 5,381,955 |
| 100 ha | 247.105 | 1,000,000 | 10,763,910 |
Getting a sense of the size
A hectare is a square 100 meters a side. An acre is closer to a rectangle of about 64 by 63 meters. If you want a rough mental conversion, multiply hectares by 2.5 and you will be within about 1.2 percent.
The US survey acre used to differ very slightly, because it was defined on the US survey foot. That foot was deprecated on 31 December 2022 and the acre was redefined on the international foot at the same time, so the distinction is now historical. This tool uses the international definition.
Common questions
How many acres is 1 hectare?
One hectare is 2.4710538 acres. Put the other way, one acre is 0.40468564 hectares.
Is a hectare bigger than an acre?
Yes, about two and a half times bigger. A hectare is 10,000 square meters; an acre is 4,046.86 square meters.
How big is a hectare?
A square 100 meters on each side. That is roughly the area of a large sports pitch including its surrounds.
Why do land listings use different units?
Hectares are standard in most of the world and in agricultural reporting. Acres remain common in the United States, the United Kingdom and parts of the Commonwealth, especially in property listings.
Related converters and guides
Sources
- U.S. Survey Foot: Frequently Asked Questions. National Institute of Standards and Technology. Source for the 31 December 2022 deprecation, the obsolete status from 1 January 2023, and the retention of the survey foot for legacy state plane coordinate systems only.
- NIST Guide to the SI, Appendix B: Conversion Factors. National Institute of Standards and Technology. Source for every conversion factor on this page, and for which factors are exact rather than rounded.