Conversion Formula
$$A_{\text{ha}} = A_{\text{ac}} \times 0.404686$$
Multiply acres by 0.404686 to get hectares.
ac to ha Conversion Table
| Acre (ac) | Hectare (ha) |
|---|---|
| 0.1 | 0.0404686 |
| 0.5 | 0.202343 |
| 1 | 0.404686 |
| 2 | 0.809371 |
| 5 | 2.02343 |
| 10 | 4.04686 |
| 25 | 10.1171 |
| 50 | 20.2343 |
| 100 | 40.4686 |
| 250 | 101.171 |
| 500 | 202.343 |
| 1,000 | 404.686 |
ac to ha in Engineering
Area conversions are essential for land development, building design, earthwork calculations, and property surveying. US engineers use acres and square feet, while international practice uses hectares and square meters.
Acre: Primary US land area unit. Equal to 43,560 ft². Standard for real estate, zoning, and land development.
Hectare: Equal to 10,000 m² (100m x 100m). International standard for land area measurement.