Convert acres to hectares
Converting acres to hectares is a common area task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 ac equals 0.404686 ha, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert acres to hectares
To convert acres to hectares, multiply the number of acres by 0.404686. For example, 10 ac × 0.404686 = 4.04686 ha.
ha = ac × 0.404686
- Write down the value in acres you want to convert.
- Multiply it by 0.404686 (the exact ac→ha factor).
- The result is your value in hectares. Check it below with the converter or the table.
Conversion table
Common values of acres and their equivalents in hectares:
| ac | ha |
|---|---|
| 1 | 0.404686 |
| 2 | 0.809371 |
| 3 | 1.21406 |
| 4 | 1.61874 |
| 5 | 2.02343 |
| 10 | 4.04686 |
| 20 | 8.09371 |
| 25 | 10.1171 |
| 50 | 20.2343 |
| 100 | 40.4686 |
| 250 | 101.171 |
| 500 | 202.343 |
About these units
Acre (ac). An acre equals exactly 4,046.8564224 square meters, or 43,560 square feet. It is the traditional land unit in the US and UK, about 0.4 hectares.
Hectare (ha). A hectare equals 10,000 square meters, or 100 m × 100 m. It is the standard land unit for farms, forests and parks in metric countries.
Frequently asked questions
How do I convert acres to hectares?
To convert acres to hectares, multiply the number of acres by 0.404686. For example, 10 ac × 0.404686 = 4.04686 ha. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many hectares are in 1 acre?
1 ac = 0.404686 ha. That is the fixed relationship used by this converter and by international standards.
How many acres are in 1 hectare?
1 ha = 2.47105 ac. If you are converting in the opposite direction, use our Hectare to Acre converter for the dedicated table and FAQ.
Is the acres to hectares conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.404686 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is acre used for?
An acre equals exactly 4,046.8564224 square meters, or 43,560 square feet. It is the traditional land unit in the US and UK, about 0.4 hectares.