Acres to Hectares
Convert acres to hectares instantly. 1 ac = 0.4046856422 ha. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert acres to hectares
To convert acres to hectares, divide by 2.4710538147 (multiply by 0.4046856422). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
ha = ac × 0.4046856422
Acres to Hectares conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Acres | Hectares |
|---|---|
| 1 ac | 0.404686 ha |
| 2 ac | 0.809371 ha |
| 3 ac | 1.214057 ha |
| 5 ac | 2.023428 ha |
| 10 ac | 4.046856 ha |
| 20 ac | 8.093713 ha |
| 25 ac | 10.117141 ha |
| 50 ac | 20.234282 ha |
| 100 ac | 40.468564 ha |
| 500 ac | 202.342821 ha |
| 1,000 ac | 404.685642 ha |
What is a acre?
43,560 square feet — historically the area one ox team could plough in a day.
What is a hectare?
10,000 square metres, or about 2.471 acres. The global standard for farmland.
The formula
ha = ac × 0.4046856422
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Acres to Hectares
- Type the number of acres you want to convert.
- Read the result in hectares straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked hectares to acres page.
Acres to Hectares — frequently asked questions
How many hectares are in a acre?
One acre equals 0.4046856422 ha. ha = ac × 0.4046856422
What is the formula to convert acres to hectares?
The formula is ha = ac × 0.4046856422. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert hectares back to acres?
Divide instead of multiplying: one hectare is 2.4710538147 ac. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this acres to hectares free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the acres to hectares.
- acres to hectares
- acres to hectares converter
- convert acres to hectares
- acre to ha
- acre to hectare
- acre to hectares
- acres to ha
- acres to hectare
About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 15, 2026 · Calculation runs client-side · No data collected · Report an error