How to convert acres to hectares
One acre equals 0.404686 hectares, so multiply the number of acres by 0.404686:
ha = ac × 0.404686
ac = ha ÷ 0.404686 (1 ha = 2.4711 ac)
Example: 0.25 ac → 0.25 × 0.404686 = 0.101171 ha.
Going the other way, divide by 0.404686, or multiply by 2.4711; the hectares to acres converter does it for you.
Everyday values
| Acres | Hectares | For example |
|---|---|---|
| 0.25 ac | 0.101171 ha | a large suburban lot |
| 1 ac | 0.404686 ha | one acre |
| 2.47 ac | 0.999574 ha | one hectare |
| 10 ac | 4.0469 ha | a small farm |
| 640 ac | 258.999 ha | one square mile |
When you need this conversion
Acres are used for land in the US, UK and several Commonwealth countries; hectares everywhere else. A football (soccer) pitch is roughly 0.7 ha or 1.8 acres, which makes a handy mental picture.
Acre to hectare conversion table
| ac | ha | ac | ha |
|---|---|---|---|
| 1 ac | 0.404686 ha | 11 ac | 4.4515 ha |
| 2 ac | 0.809371 ha | 12 ac | 4.8562 ha |
| 3 ac | 1.2141 ha | 13 ac | 5.2609 ha |
| 4 ac | 1.6187 ha | 14 ac | 5.6656 ha |
| 5 ac | 2.0234 ha | 15 ac | 6.0703 ha |
| 6 ac | 2.4281 ha | 16 ac | 6.475 ha |
| 7 ac | 2.8328 ha | 17 ac | 6.8797 ha |
| 8 ac | 3.2375 ha | 18 ac | 7.2843 ha |
| 9 ac | 3.6422 ha | 19 ac | 7.689 ha |
| 10 ac | 4.0469 ha | 20 ac | 8.0937 ha |
About the units
- Acre (ac): 43,560 square feet, about 4,046.86 m².
- Hectare (ha): 10,000 square metres (100 m × 100 m).
Both are units of area. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many hectares are in one acre?
One acre is 0.404686 hectares. One hectare is 2.4711 acres.
How do I convert acres to hectares?
Multiply the value in acres by 0.404686. To go back, divide by 0.404686.
What is 0.25 ac in hectares?
0.25 ac = 0.101171 ha.
What is 2.47 ac in hectares?
2.47 ac = 0.999574 ha.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.