Acres to Hectares Converter
Convert acres to hectares and back. 1 acre = 0.40468564224 hectares exactly.
Tip: Results show up to 8 significant digits. The factors and their sources are listed on the "Where our numbers come from" page.
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Acres and Hectares
One acre is exactly 0.40468564224 hectares, and one hectare is about 2.47105381467 acres. The converter works both ways: use the two tabs at the top of the tool to choose the direction.
Quick conversion table
Acres to Hectares
| Acres | Hectares |
|---|---|
| 0.25 ac | 0.10117141 ha |
| 0.5 ac | 0.20234282 ha |
| 1 ac | 0.40468564 ha |
| 2 ac | 0.80937128 ha |
| 5 ac | 2.0234282 ha |
| 10 ac | 4.0468564 ha |
| 20 ac | 8.0937128 ha |
| 40 ac | 16.187426 ha |
| 80 ac | 32.374851 ha |
| 100 ac | 40.468564 ha |
| 160 ac | 64.749703 ha |
| 640 ac | 258.99881 ha |
Hectares to Acres
| Hectares | Acres |
|---|---|
| 0.1 ha | 0.24710538 ac |
| 0.5 ha | 1.2355269 ac |
| 1 ha | 2.4710538 ac |
| 2 ha | 4.9421076 ac |
| 5 ha | 12.355269 ac |
| 10 ha | 24.710538 ac |
| 20 ha | 49.421076 ac |
| 50 ha | 123.55269 ac |
| 100 ha | 247.10538 ac |
| 500 ha | 1,235.5269 ac |
Exact factor and source
| Conversion | Value | Basis |
|---|---|---|
| 1 acre in hectares | 0.40468564224 | exact. 1 acre = 43,560 ft2 with the international foot = 4,046.8564224 m2 exactly (derived; the US survey acre is slightly larger) |
| 1 hectare in acres | 2.47105381467 | rounded to 12 digits. SI Brochure, 9th edition (BIPM 2019): the hectare is accepted for use with the SI; 1 ha = 10,000 m2 |
How to convert acres to hectares
- Step oneTake the number of acres.
- Step twoMultiply it by 0.40468564224.
- Step threeThe result is the number of hectares.
- Step fourTo go back, divide by 0.40468564224, or multiply by 2.47105381467.
Example: 5 ac x 0.40468564224 = 2.0234282112 ha.
All area units compared
Each unit written in square meters, the base unit of this tool. Exact values come straight from the definitions.
| Unit | Symbol | Value in square meters |
|---|---|---|
| Square meters | m² | 1 square meter |
| Square feet | ft² | 0.09290304 square meters |
| Square inches | in² | 0.00064516 square meters |
| Acres | ac | 4,046.8564224 square meters |
| Hectares | ha | 10,000 square meters |
| Square kilometers | km² | 1,000,000 square meters |
| Square miles | mi² | 2,589,988.11034 square meters |
What is an acre?
The acre is exactly 43,560 square feet, which is 4,046.8564224 square meters or 0.40468564224 hectares. Land in the US and UK is sold and measured in acres.
What is a hectare?
The hectare (ha) is 10,000 square meters, the area of a square 100 meters on each side. It equals 2.47105381467 acres and is the usual metric unit for farmland.
What this converter does not do
- Results are rounded for display to 8 significant digits; the stored factor is the exact one.
- It uses the international acre and foot, not the US survey versions.
- It converts areas only; it does not turn a length and a width into an area.
Frequently asked questions
How many hectares are in an acre?
1 acre is exactly 0.40468564224 hectares. That factor is exact by definition.
How many acres are in a hectare?
1 hectare is about 2.47105381467 acres.
How many hectares is a 5 acre lot?
5 acres is 2.0234282 hectares, or 20,234.282 square meters.
Where do the factors come from?
Acres: 1 acre = 43,560 ft2 with the international foot = 4,046.8564224 m2 exactly (derived; the US survey acre is slightly larger). Hectares: SI Brochure, 9th edition (BIPM 2019): the hectare is accepted for use with the SI; 1 ha = 10,000 m2.
References
- Acres: 1 acre = 43,560 ft2 with the international foot = 4,046.8564224 m2 exactly (derived; the US survey acre is slightly larger)
- Hectares: SI Brochure, 9th edition (BIPM 2019): the hectare is accepted for use with the SI; 1 ha = 10,000 m2
- NIST Special Publication 811: Guide for the Use of the International System of Units (SI), 2008 edition.
- The International System of Units (SI Brochure), 9th edition, BIPM.