Convert Acres to Hectares
2.5 acres is 1.01 ha. One acre is exactly 0.40468564224 hectares.
2.5 acres is 1.0117141 hectares, because one acre is 0.40468564 hectares. To convert acres to hectares, multiply by 0.40468564; to go the other way, divide by 0.40468564 or multiply by 2.4710538. The relation is exact but the figure is not: it is a rounding of a number that does not terminate, and it follows from NIST Office of Weights and Measures. Exactly 43,560 square feet — historically the land one team of oxen could plough in a day.
Factor checked against the defining standard · How we check
- Acres × 0.40468564
2.5 * 0.40468561.012 ha
2.5 acres in every area unit
| Unit | Value | Exact factor |
|---|---|---|
| square inches | 15,681,600 sq in | × 6,272,640 |
| square feet | 108,900 sq ft | × 43,560 |
| square yards | 12,100 sq yd | × 4,840 |
| acres (as entered) | 2.5 ac | — |
| square meters | 10,117.14106 m² | × 4,046.8564224 |
| square millimetres | 10,117,141,060 mm² | × 4,046,856,422.4 |
| square centimetres | 101,171,410.6 cm² | × 40,468,564.224 |
| square kilometres | 0.01011714106 km² | × 0.0040468564224 |
| square miles | 0.00390625 mi² | × 0.0015625 |
| hectares | 1.011714106 ha | × 0.40468564224 |
Factors are entered by hand from NIST Office of Weights and Measures rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert acres to hectares? The converter and the working
- 1.Take the measurement in acres.
- 2.Multiply by 0.40468564 — that is how many hectares fit in one acre.
- 3.To go back the other way, divide by 0.40468564, or multiply by 2.4710538.
Worked example: 25 acres to hectares
- Formula
- ac × 0.40468564 = ha
- Arithmetic
- 25 × 0.40468564 = 10.12 ha
- Answer
- 25 ac = 10.12 ha
The factor is rounded for display; the figure above is computed from the full value.
Acres to hectares conversion table
| Acres | Hectares |
|---|---|
| 1 ac | 0.4 ha |
| 2 ac | 0.81 ha |
| 3 ac | 1.21 ha |
| 4 ac | 1.62 ha |
| 5 ac | 2.02 ha |
| 6 ac | 2.43 ha |
| 7 ac | 2.83 ha |
| 8 ac | 3.24 ha |
| 9 ac | 3.64 ha |
| 10 ac | 4.05 ha |
| 12 ac | 4.86 ha |
| 15 ac | 6.07 ha |
| 20 ac | 8.09 ha |
| 25 ac | 10.12 ha |
| 50 ac | 20.23 ha |
| 100 ac | 40.47 ha |
| 200 ac | 80.94 ha |
| 300 ac | 121.41 ha |
| 500 ac | 202.34 ha |
| 1000 ac | 404.69 ha |
| 2000 ac | 809.37 ha |
| 5000 ac | 2,023.43 ha |
| 10000 ac | 4,046.86 ha |
One is 43,560 square feet, the other is 10,000 square meters
The acre is exactly 43,560 square feet — a chain by a furlong, inherited rather than designed. The hectare is a square hectometer, 10,000 m², designed rather than inherited. One hectare is about 2.471 acres. Neither is an SI unit, and both are still how land is priced.
NIST Handbook 44, Appendix C — general tables of units of measurement
What is an acre?
Exactly 43,560 square feet — historically the land one team of oxen could plough in a day.
What is a hectare?
10,000 square meters, or about 2.471 acres. The metric unit of land area.
How many hectares are in an acre?
One acre is 0.40468564 hectares. Going the other way, one hectare is 2.4710538 acres. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every area unit here
The whole group — 10 units with their symbols and the size of each one in square meters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to an acre.
Cite this page
- APA
- Rule Calculator. (2026). Convert Acres to hectares. Rule Calculator. https://rulecalculators.com/convert/acre-to-hectare
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- Chicago
- Rule Calculator. "Convert Acres to hectares." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/acre-to-hectare.
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Questions people actually ask
- How many hectares are in an acre?
- 0.40468564. 10,000 square meters, or about 2.471 acres. The metric unit of land area.
- How do I convert hectares back to acres?
- Divide by 0.40468564, or multiply by 2.4710538 — they are the same operation.
The values people look up
Each one is this page with the value filled in, and each answers in its own title.
Other area conversions
Hectares to acres — the same conversion the other way.