About the ha to ac calculation
One hectare is exactly 2.4711 acres, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Exactly 10,000 m², the metric standard for farmland and land registry. The standard land unit in the US and UK — originally the area one ox team could plough in a day.
Formula
ac = ha × 2.4711
1 ha = 2.4711 ac
1 ac = 0.404686 haWorked example
To convert 1 ha, multiply by 2.4711: 1 × 2.4711 = 2.4711 ac.
Frequently asked questions
How many acres are in a hectare?
There are 2.4711 acres in one hectare. To convert any amount, multiply the number of hectares by 2.4711.
How do I convert acres back to hectares?
Divide instead of multiplying, or equivalently multiply by 0.404686. One acre is 0.404686 hectares.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between hectares and acres is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Hectares: exactly 10,000 m², the metric standard for farmland and land registry. Acres: the standard land unit in the US and UK — originally the area one ox team could plough in a day.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units