Hectares to Acres Converter
Convert hectares to acres — multiply by 2.471. Results update as you type; exact factors shown.
One hectare is 2.4711 acres — see the exact factor, not a rounded rule of thumb.
How the hectares to acres converter works
Areas convert through the square meter. Because the inch is exactly 25.4 mm, a square foot is exactly 0.09290304 m², an acre (43,560 square feet) is exactly 4,046.8564224 m² and a square mile (640 acres) is 2,589,988.110336 m². A hectare is 10,000 m² by definition.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common area conversions
| From | To | Units |
|---|---|---|
| 0.5 ha | 1.2355 ac | hectares to acres |
| 1 ha | 2.4711 ac | hectare to acres |
| 2 ha | 4.9421 ac | hectares to acres |
| 5 ha | 12.3553 ac | hectares to acres |
| 10 ha | 24.7105 ac | hectares to acres |
| 20 ha | 49.4211 ac | hectares to acres |
| 25 ha | 61.7763 ac | hectares to acres |
| 50 ha | 123.5527 ac | hectares to acres |
| 100 ha | 247.1054 ac | hectares to acres |
| 200 ha | 494.2108 ac | hectares to acres |
| 500 ha | 1,235.5269 ac | hectares to acres |
| 1,000 ha | 2,471.0538 ac | hectares to acres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in square meters |
|---|---|---|
| square millimeter | mm² | 0.000001 square meter |
| square centimeter | cm² | 0.0001 square meter |
| square meter | m² | 1 square meter |
| hectare | ha | 10,000 square meter |
| square kilometer | km² | 1,000,000 square meter |
| square inch | in² | 0.00064516 square meter |
| square foot | ft² | 0.09290304 square meter |
| square yard | yd² | 0.83612736 square meter |
| acre | ac | 4,046.8564224 square meter |
| square mile | mi² | 2,589,988.110336 square meter |
FAQFrequently asked questions about area conversion
How many acres is 1 hectare?
2.47105 acres.
How big is a hectare in familiar terms?
About two and a half acres, or a little larger than a rugby pitch including the in-goal areas.
How many hectares in a square kilometer?
One hundred.
Is a hectare an SI unit?
Not strictly, but it is accepted for use with SI and is the standard unit of land area worldwide.
How do I estimate hectares to acres?
Multiply by 2.5 and take a little off.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.