How this calculator works
An international acre is exactly 43,560 square feet. With the foot defined as 0.3048 m, one acre is 4,046.8564224 m2. A hectare is 10,000 m2, giving exactly 0.40468564224 hectares per acre. The table keeps the international acre definition throughout.
Formula
hectares = acres x 0.40468564224; acres = hectares / 0.40468564224.
Worked example
A 40 acre field is 16.1874256896 ha. In the reverse direction, a 10 ha parcel is approximately 24.7105381467 acres.
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Frequently asked questions
How many hectares are in 100 acres?
Exactly 40.468564224 ha using international acres.
Is a hectare bigger than an acre?
Yes. One hectare is approximately 2.47105 acres, so a hectare count is smaller for the same parcel.
Does this use survey acres?
No. Old US survey acres differ slightly. Check the definition on historical survey documents before converting.