An acre is a traditional land area unit used in the US and UK.
Acres to Hectares
Convert acres (ac) to hectares (ha) instantly. Free online area converter with formulas, tables and examples.
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A hectare is 10,000 square meters.
ha = ac × 0.40468564224
Results update instantly for Acres to Hectares conversions.
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Formula
ha = ac × 0.40468564224
ac = ha ÷ 0.40468564224
Conversion table
| 1 ac | 0.404686 ha |
| 5 ac | 2.023428 ha |
| 10 ac | 4.046856 ha |
| 25 ac | 10.117141 ha |
| 50 ac | 20.234282 ha |
| 100 ac | 40.468564 ha |
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Step-by-step example
- Start with the value you want to convert: 25 ac.
- Apply the formula: ha = 25 × 0.40468564224.
- Work out the calculation: 25 × 0.40468564224 = 10.12.
- Result: 25 ac is equal to 10.12 ha.
Acre vs Hectare
| Attribute | Acre | Hectare |
|---|---|---|
| Symbol | ac | ha |
| Category | Area | Area |
| System | US customary / Imperial | Metric |
| Typically used for | An acre is a traditional land area unit used in the US and UK. | A hectare is 10,000 square meters. |
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Frequently asked questions
How do you convert acre to hectare?
Use the formula ha = ac × 0.40468564224. One acre equals 0.40468564224 hectares.
What is Acre?
An acre is a traditional land area unit used in the US and UK.
What is Hectare?
A hectare is 10,000 square meters.
Is the acre to hectare conversion exact?
Yes. Acre and Hectare are both defined against internationally agreed constants, so the conversion factor used here is exact -- any rounding you see comes only from the number of decimal places displayed, not from the relationship itself.
How do I convert hectare back to acre?
Use the reverse formula ac = ha ÷ 0.40468564224. This site's reverse converter does the same calculation automatically.
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About this conversion
This area converter turns acre into hectare using the exact defined relationship between the two units, not an approximation. A farmer with 25 acres owns approximately 10.12 hectares. The acre originates from medieval England as the area a yoke of oxen could plow in a day, later standardized at 43,560 square feet. The hectare was introduced with the metric system as 10,000 square meters, or the area of a square 100 meters on each side. Because both units are built on internationally standardized constants, the same acre-to-hectare factor works whether you're doing a quick everyday estimate or a calculation that needs to be precise.