Hectare to Acre Converter
Converts hectare to acre (ha to ac) and back. The conversion factor is shown below every result.
How to Convert Hectare to Acre
What Is a Hectare?
The hectare (ha) is a metric unit of land area equal to exactly 10,000 square meters.
What Is an Acre?
The acre (ac) is a US customary and imperial unit of land area, defined as exactly 43,560 square feet (about 4,046.86 square meters).
Common Hectare to Acre Reference Points
Real-world reference values for quick sanity checks.
| Item | Hectare (ha) | Acre (approx.) |
|---|---|---|
| A soccer pitch (approx.) | 0.71 ha | 1.75 ac |
| A typical large farm field | 10 ha | 24.71 ac |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Hectare to Acre Conversion Table
| Hectare (ha) | Acre (ac) |
|---|---|
| 0.5 ha | 1.235527 ac |
| 1 ha | 2.471054 ac |
| 2 ha | 4.942108 ac |
| 5 ha | 12.355269 ac |
| 10 ha | 24.710538 ac |
| 25 ha | 61.776345 ac |
| 50 ha | 123.552691 ac |
| 100 ha | 247.105381 ac |
| Source: NIST SP 811, Appendix B (1 hectare = 10,000 m² exactly; 1 acre = 4,046.8564224 m² using the international foot) | |
Frequently Asked Questions
How do I convert hectares to acres?
Multiply the hectare value by 2.4710538147. For example, 5 ha × 2.4710538147 = 12.355 ac.
Why isn't the hectare-to-acre factor a round number?
The hectare is a clean metric unit (exactly 10,000 m²), but the acre traces back to a foot-based definition (43,560 sq ft), and the two systems don't line up on a round ratio. The factor shown carries the full precision from both exact definitions.
Is a hectare bigger than an acre?
Yes. 1 hectare is about 2.47 acres, so a hectare is roughly two and a half times the size of an acre.
Related Area Converters
A good measuring tool marked in both ha and ac removes the guesswork at the point of use.