Acre to Hectare Converter (ac to ha) With Formula
1 acre equals 0.40468564 hectares — multiply the number of acres by 0.40468564 to convert. This is an exact area conversion used everywhere land is measured, from farm records to real-estate listings that mix imperial and metric units.
The formula
To convert acres to hectares, multiply by the exact factor 0.40468564:
hectares = acres × 0.40468564
For example, 10 ac × 0.40468564 = 4.0468564 ha. To reverse it, divide by 0.40468564 (or multiply by 2.471054).
Conversion table
| Acres (ac) | Hectares (ha) |
|---|---|
| 1 | 0.40468564 |
| 2 | 0.80937128 |
| 3 | 1.21405692 |
| 5 | 2.0234282 |
| 10 | 4.0468564 |
| 25 | 10.117141 |
| 50 | 20.234282 |
| 100 | 40.468564 |
| 500 | 202.34282 |
| 1000 | 404.68564 |
How to convert online
- Type the number of acres into the first box.
- Read the hectare value instantly in the second box.
- Enter a hectare value to convert back to acres — it works both ways.
Use the Acre to Hectare Converter — free and instant in your browser.
Where this conversion is used
Acres are standard in the US and UK for property and farmland, while hectares are the metric unit used across Europe, agriculture science and international mapping. Converting between them matters when buying rural land, filing agricultural subsidy paperwork, or comparing plot sizes across countries.
FAQ
How many hectares are in an acre?
One acre equals 0.40468564 hectares. So 10 acres is 4.0468564 hectares and 100 acres is 40.468564 hectares.
How do I convert hectares back to acres?
Divide by 0.40468564, or multiply by 2.471054. For example, 1 hectare is about 2.471054 acres.
Is the conversion exact?
Yes. The factor 0.40468564 comes from the exact definition of the acre (4046.8564224 m²) relative to the hectare (10,000 m²), so the tool never rounds by hand.
Is this converter free and private?
Yes. Everything runs in your browser with JavaScript — nothing you type is uploaded or stored. It is free, needs no sign-up and works offline once loaded.
Related converters
- Hectare to Acre Converter
- Acre to Square Meter Converter
- Acre to Square Kilometer Converter
- Acre to Square Foot Converter
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