Area converter
Acres to Hectares
If you need to know how many Hectares one Acres contains, the answer is 0.40468564. The conversion is linear, so 10 ac is 4.046856 ha and 100 ac is 40.468564 ha. Use the converter for any other value.
Formula 1 ac = 0.40468564 ha
Need the other direction? Hectares to Acres.
How to convert Acres to Hectares
An international acre is 4,046.8564224 square metres, historically the area a team could plough in a day. A hectare is exactly 10,000 square metres, or about 2.471 acres.
To convert Acres to Hectares, multiply the value in ac by 0.40468564. For example, 10 ac × 0.40468564 = 4.046856 ha. This works because the ratio between the two units is constant for every value in area.
Worked examples
| ac | ha |
|---|---|
| 1 ac | 0.40468564 ha |
| 2.5 ac | 1.011714 ha |
| 5 ac | 2.023428 ha |
| 10 ac | 4.046856 ha |
| 25 ac | 10.117141 ha |
| 50 ac | 20.234282 ha |
| 100 ac | 40.468564 ha |
Reverse conversion
| ha | ac |
|---|---|
| 1 ha | 2.471054 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 |
When this conversion is useful
This is the calculation you need when you are comparing property listings, land size or building materials across measurement systems. Because the factor is fixed, you can use the same number for a single measurement or for a batch: 1,000 ac is 404.685642 ha.
Is the conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Reference: BIPM SI Brochure and NIST SP 811. Last reviewed: 2026-11-01.
ac to ha conversion chart
The chart lists the most requested values. For a value that is not here, use the converter at the top of the page.
| Acres (ac) | Hectares (ha) |
|---|---|
| 1 ac | 0.40468564 ha |
| 2 ac | 0.80937128 ha |
| 3 ac | 1.214057 ha |
| 4 ac | 1.618743 ha |
| 5 ac | 2.023428 ha |
| 6 ac | 2.428114 ha |
| 7 ac | 2.832799 ha |
| 8 ac | 3.237485 ha |
| 9 ac | 3.642171 ha |
| 10 ac | 4.046856 ha |
| 11 ac | 4.451542 ha |
| 12 ac | 4.856228 ha |
| 13 ac | 5.260913 ha |
| 14 ac | 5.665599 ha |
| 15 ac | 6.070285 ha |
| 16 ac | 6.47497 ha |
| 17 ac | 6.879656 ha |
| 18 ac | 7.284342 ha |
| 19 ac | 7.689027 ha |
| 20 ac | 8.093713 ha |
| 21 ac | 8.498398 ha |
| 22 ac | 8.903084 ha |
| 23 ac | 9.30777 ha |
| 24 ac | 9.712455 ha |
| 25 ac | 10.117141 ha |
| 26 ac | 10.521827 ha |
| 27 ac | 10.926512 ha |
| 28 ac | 11.331198 ha |
| 29 ac | 11.735884 ha |
| 30 ac | 12.140569 ha |
| 31 ac | 12.545255 ha |
| 32 ac | 12.949941 ha |
| 33 ac | 13.354626 ha |
| 34 ac | 13.759312 ha |
| 35 ac | 14.163997 ha |
| 36 ac | 14.568683 ha |
| 37 ac | 14.973369 ha |
| 38 ac | 15.378054 ha |
| 39 ac | 15.78274 ha |
| 40 ac | 16.187426 ha |
| 41 ac | 16.592111 ha |
| 42 ac | 16.996797 ha |
| 43 ac | 17.401483 ha |
| 44 ac | 17.806168 ha |
| 45 ac | 18.210854 ha |
| 46 ac | 18.61554 ha |
| 47 ac | 19.020225 ha |
| 48 ac | 19.424911 ha |
| 49 ac | 19.829596 ha |
| 50 ac | 20.234282 ha |
| 60 ac | 24.281139 ha |
| 70 ac | 28.327995 ha |
| 80 ac | 32.374851 ha |
| 90 ac | 36.421708 ha |
| 100 ac | 40.468564 ha |
Frequently asked questions
How many Hectares are in 1 Acres?
1 ac equals 0.40468564 ha.
How do I convert Acres to Hectares?
Multiply the ac value by 0.40468564. Example: 25 ac = 10.117141 ha.
What is 2.5 ac in ha?
2.5 ac = 1.011714 ha.
Is the ac to ha conversion exact?
Yes for practical use: the factors come from international definitions, with rounding applied only for display.
Does the calculator work offline?
Yes. The conversion runs in your browser with JavaScript, so it works after the page has loaded, even without a connection.