Acre to Hectare Converter
One Acre equals 0.4046856422 Hectare (1 acre = 0.4046856422 ha). Multiply a Acre value by 0.4046856422 to get the equivalent in Hectare. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
ha = acre × 0.4046856422
Multiply the Acre value by 0.4046856422 to get the equivalent value in Hectare.
Example Conversions
1 Acre (acre)
0.4046856422 Hectare (ha)
5 Acre (acre)
2.023428211 Hectare (ha)
10 Acre (acre)
4.046856422 Hectare (ha)
25 Acre (acre)
10.11714106 Hectare (ha)
100 Acre (acre)
40.46856422 Hectare (ha)
Conversion Table
| Acre (acre) | Hectare (ha) |
|---|---|
| 0.1 | 0.04046856422 |
| 0.5 | 0.2023428211 |
| 1 | 0.4046856422 |
| 2 | 0.8093712845 |
| 5 | 2.023428211 |
| 10 | 4.046856422 |
| 25 | 10.11714106 |
| 50 | 20.23428211 |
| 100 | 40.46856422 |
| 250 | 101.1714106 |
| 500 | 202.3428211 |
| 1000 | 404.6856422 |
How to Convert Manually
Use these steps to convert Acre values to Hectare without the calculator.
- Write down the value in Acre (acre) that you want to convert.
- Multiply that value by 0.4046856422.
- For example, 10 Acre × 0.4046856422 = 4.046856422 Hectare.
- Label the result as Hectare (ha).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Acre and one Hectare.
About Acre and Hectare
The acre is 43,560 square feet, exactly 4,046.8564224 square meters — historically the area a yoke of oxen could plow in a day. US and UK land sales still quote it. The hectare is 10,000 square meters — a square 100 meters on each side. It is the standard metric unit for land: farms, forests, and development sites. One Acre equals 0.4046856422 Hectare (1 acre = 0.4046856422 ha). Acre to Hectare conversion comes up most often in US and UK land sales and in farm and ranch sizes in the US, typically when figures need restating for farm and agricultural land.
Precision and Rounding: Area factors are the squares of exact length factors, so they are exact too (1 ft² = 0.09290304 m² precisely). Whole numbers usually suffice for rooms and land parcels; surveying and legal land descriptions carry four or more decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Acre equals 6.070284634 Hectare.
15 acre × 0.4046856422 = 6.070284634 ha
FAQ
How do I convert Acre to Hectare?
Multiply the Acre value by 0.4046856422 to get the equivalent value in Hectare.
What is the formula for Acre to Hectare?
The formula is ha = acre × 0.4046856422.
How many Hectare are in 1 Acre?
1 Acre equals 0.4046856422 Hectare.
Can I convert Hectare back to Acre?
Yes. 1 Hectare equals 2.471053815 Acre, and the related converter can reverse the calculation.
What are common names for Acre and Hectare?
Acre is shown as acre and may also be searched as acres. Hectare is shown as ha and may also be searched as hectares.
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