This acres to hectares converter gives you the ac to ha result instantly, in your browser, with the exact ratio so you can verify it. 1 acre is about 0.404686 hectares, and going the other way, 1 hectare is 2.47105 acres. Acres are an imperial unit still common in the United States and the United Kingdom; hectares are part of the metric system used in most countries.
To convert by hand, multiply the number of acres by 0.404686. For example, 10 acres is 4.04686 hectares and 100 acres is 40.4686 hectares. The table below lists the most requested values, and the converter above accepts decimals for anything in between.
ac to ha formula
ha = ac × 0.404686
1 acre is about 0.404686 hectares. Multiply the value in acres by that factor to get hectares.
Acres to Hectares conversion table
| acres | hectares | Rounded |
|---|---|---|
| 1 ac | 0.404686 ha | 0.405 |
| 2 ac | 0.809371 ha | 0.809 |
| 3 ac | 1.21406 ha | 1.21 |
| 4 ac | 1.61874 ha | 1.62 |
| 5 ac | 2.02343 ha | 2.02 |
| 6 ac | 2.42811 ha | 2.43 |
| 7 ac | 2.8328 ha | 2.83 |
| 8 ac | 3.23749 ha | 3.24 |
| 9 ac | 3.64217 ha | 3.64 |
| 10 ac | 4.04686 ha | 4.05 |
| 12 ac | 4.85623 ha | 4.86 |
| 15 ac | 6.07028 ha | 6.07 |
| 20 ac | 8.09371 ha | 8.09 |
| 25 ac | 10.1171 ha | 10.1 |
| 30 ac | 12.1406 ha | 12.1 |
| 40 ac | 16.1874 ha | 16.2 |
| 50 ac | 20.2343 ha | 20.2 |
| 60 ac | 24.2811 ha | 24.3 |
| 70 ac | 28.328 ha | 28.3 |
| 75 ac | 30.3514 ha | 30.4 |
| 80 ac | 32.3749 ha | 32.4 |
| 90 ac | 36.4217 ha | 36.4 |
| 100 ac | 40.4686 ha | 40.5 |
| 150 ac | 60.7028 ha | 60.7 |
| 200 ac | 80.9371 ha | 80.9 |
| 250 ac | 101.171 ha | 101 |
| 300 ac | 121.406 ha | 121 |
| 500 ac | 202.343 ha | 202 |
| 750 ac | 303.514 ha | 304 |
| 1,000 ac | 404.686 ha | 405 |
Frequently asked questions
How many hectares are in 5 acres?
5 ac = 2.02343 ha. Multiply 5 by 0.404686, the number of hectares in one acre. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert acres to hectares?
ha = ac × 0.404686. The factor comes from the definitions of the units: 1 acre is about 0.404686 hectares. Worked example: 12 ac = 4.85623 ha.
Is 30 ac the same as 12.1406 ha?
Yes. 30 ac = 12.1406 ha. Rounded to four decimals it is 12.14 ha.
How do I convert hectares back to acres?
Divide by 0.404686, or multiply by 2.47105: 1 hectare is 2.47105 acres. The hectares to acres page linked above lists common values the other way.
Is the ac to ha conversion exact?
1 acre is about 0.404686 hectares. The ratio is a defined constant but produces a long decimal, so this page rounds to six significant digits, which is more precision than any everyday measurement needs.