Acres to Hectares Converter
Convert acres (ac) to hectares (ha) instantly. Type a value above and the result updates while you type. 1 acre equals 0.404686 hectares.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 acre = 0.404686 hectares
Multiply the acres value by 0.404686 to get hectares. Or divide by 2.47105 to go the other way.
Acres to hectares conversion table
| ac | ha |
|---|---|
| 1 | 0.404686 |
| 2 | 0.809371 |
| 3 | 1.21406 |
| 4 | 1.61874 |
| 5 | 2.02343 |
| 6 | 2.42811 |
| 7 | 2.8328 |
| 8 | 3.23749 |
| 9 | 3.64217 |
| 10 | 4.04686 |
| 15 | 6.07028 |
| 20 | 8.09371 |
| 25 | 10.1171 |
| 50 | 20.2343 |
| 75 | 30.3514 |
| 100 | 40.4686 |
Worked examples
- 5 ac × 0.404686 = 2.02343 ha
- 30 ac × 0.404686 = 12.1406 ha
- 165 ac × 0.404686 = 66.7731 ha
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
Looking for the other direction?
Frequently asked questions
How many hectares are in 1 acre?
1 acre equals 0.404686 hectares (ac → ha).
How do you convert acres to hectares?
Multiply the number of acres by 0.404686. For example: 10 ac × 0.404686 = 4.04686 ha.
What is 50 ac in ha?
50 ac equals 20.2343 ha.
Which is bigger: 1 acre or 1 hectare?
1 hectare is bigger: 1 acre is only 0.404686 hectares.