Acres to Hectares converter
1 ac = 0.40468564224 ha
One acre is 4046.856 422 4 m², and a hectare is 10 000 m², so 1 ac ≈ 0.404 686 ha. Land listings and farm sizes are the usual context.
10 ac = 4.046856422 ha
Formula: ha = ac ÷ 2.47105381467
10 ac in every area unit
- square centimetre
- square metre
- hectare
- square kilometre
- square inch
- square foot
- square yard
- square mile
How to convert acres to hectares
ha = ac ÷ 2.47105381467
Example: 10 ac × 0.40468564224 = 4.046856422 ha.
acre: 1 ac = 43 560 ft² = 4046.856 422 4 m² (NIST SP 811; Federal Register 85 FR 62698 (2020))
hectare: 1 ha = 100 m × 100 m = 10 000 m² (BIPM SI Brochure)
Where the number 0.40468564 comes from
Nothing is measured here. Every step below is a definition written into law or into the SI.
1 ac
Acres to Hectares table
| acres (ac) | hectares (ha) |
|---|---|
| 0.25 | 0.1011714 |
| 0.5 | 0.2023428 |
| 1 | 0.4046856 |
| 2 | 0.8093713 |
| 2.471 | 0.9999782 |
| 3 | 1.214057 |
| 5 | 2.023428 |
| 10 | 4.046856 |
| 20 | 8.093713 |
| 25 | 10.11714 |
| 40 | 16.18743 |
| 50 | 20.23428 |
| 80 | 32.37485 |
| 100 | 40.46856 |
| 160 | 64.7497 |
| 200 | 80.93713 |
| 500 | 202.3428 |
| 640 | 258.9988 |
| 1,000 | 404.6856 |
Questions
How many hectares are in 1 acre?
1 ac = 0.40468564224 ha.
What is the formula to convert acres to hectares?
ha = ac ÷ 2.47105381467. 1 ac = 43 560 ft² = 4046.856 422 4 m²; 1 ha = 100 m × 100 m = 10 000 m².
Is this conversion exact?
Yes. Both units are defined exactly (NIST SP 811; Federal Register 85 FR 62698 (2020); BIPM SI Brochure), so the factor is exact and results are only rounded for display.
What is 10 ac in ha?
10 ac = 4.046856422 ha.