📏 Acres to Hectares Converter
Convert acres (ac) to hectares (ha) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 acre (ac) = 0.40468564 hectares (ha). Formula: ha = ac × 0.40468564.
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Acres to Hectares Converter inputs
Result
Acres to Hectares conversion table
| Acres (ac) | Hectares (ha) |
|---|---|
| 0.1 ac | 0.040468564 ha |
| 0.5 ac | 0.20234282 ha |
| 1 ac | 0.40468564 ha |
| 2 ac | 0.80937128 ha |
| 3 ac | 1.2140569 ha |
| 5 ac | 2.0234282 ha |
| 10 ac | 4.0468564 ha |
| 20 ac | 8.0937128 ha |
| 25 ac | 10.117141 ha |
| 50 ac | 20.234282 ha |
| 100 ac | 40.468564 ha |
| 1,000 ac | 404.68564 ha |
Other area conversions
How to convert acres to hectares
Multiply the number of acres by 0.40468564 to get hectares: ha = ac × 0.40468564.
Example: 5 ac = 2.0234282 ha.
The acre (ac) and the hectare (ha) are both units of area. Need the opposite direction? Use the ha to ac converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many hectares are in a acre?
1 acre = 0.40468564 hectares.
How do I convert acres to hectares?
Use the formula ha = ac × 0.40468564. For example, 5 ac = 2.0234282 ha.
How do I convert hectares back to acres?
1 hectare = 2.4710538 acres. Use the ha to ac converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.