Multiply ac by 0.4046856422 to get ha. The displayed factor is rounded; the calculator uses the full stored conversion factor.
An international acre is 4,046.8564224 m² and a hectare is 10,000 m². The conversion does not determine usable or buildable land.
Worked example
5 ac = 2.0234282112 ha. To reverse it, enter the unrounded output and select Swap units. Round only the final result; converting an already-rounded result back may not reproduce the original exactly.
Conversion table in both directions
ac and ha reference values
Input
ac → ha
ha → ac
1
0.4046856422
2.4710538147
2
0.8093712845
4.9421076293
5
2.0234282112
12.3552690734
10
4.0468564224
24.7105381467
20
8.0937128448
49.4210762934
25
10.117141056
61.7763453668
50
20.234282112
123.5526907336
100
40.468564224
247.1053814672
500
202.34282112
1,235.5269073358
1000
404.68564224
2,471.0538146717
Last updated . Results are estimates for informational purposes only.