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Hectares to Acres (ha to acre)
Convert hectares to acres: 1 ha = 2.47105 acre. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 ha = 2.47105 acre
acres = hectares × 2.471053815 — reverse: hectares = acres × 0.4046856422
The factor is derived from the SI definitions of both units (base unit: m2) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 ha = 12.3553 acre
- 12.5 ha = 30.8882 acre
- 100 ha = 247.105 acre
Hectares to acres conversion table
| Hectares (ha) | Acres (acre) |
|---|---|
| 1 | 2.47105 |
| 2 | 4.94211 |
| 3 | 7.41316 |
| 4 | 9.88422 |
| 5 | 12.3553 |
| 6 | 14.8263 |
| 7 | 17.2974 |
| 8 | 19.7684 |
| 9 | 22.2395 |
| 10 | 24.7105 |
| 15 | 37.0658 |
| 20 | 49.4211 |
| 25 | 61.7763 |
| 30 | 74.1316 |
| 40 | 98.8422 |
| 50 | 123.553 |
| 75 | 185.329 |
| 100 | 247.105 |
| 200 | 494.211 |
| 250 | 617.763 |
| 500 | 1235.53 |
| 1000 | 2471.05 |
FAQ
How many acres are in one hectare?
1 ha = 2.47105 acre. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert hectares to acres?
Multiply the value in hectares by 2.471053815: acres = hectares × 2.471053815. For example, 5 ha = 12.3553 acre.
How do I convert acres back to hectares?
Multiply by the inverse factor 0.4046856422 (hectares = acres × 0.4046856422), or use the acres-to-hectares page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=ha&to_unit=acre - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"ha","to_unit":"acre"} - Markdown: https://tttkmbb.com/conversion/hectares-to-acres.md · JSON: https://tttkmbb.com/conversion/hectares-to-acres.json (add
?value=for a result) · Units: /api/v1/units?quantity=area - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.