How this calculator works
The are and the hectare are both metric land units built from the metre. One are is 100 square metres and one hectare is 10,000 square metres, so one hectare is exactly 100 ares. The acre readout uses the international acre of 4,046.8564224 square metres.
Formula
hectares = ares / 100. ares = hectares x 100. square metres = ares x 100. acres = square metres / 4,046.8564224.
Worked example
250 ares = 2.5 hectares = 25,000 m2 = 6.17763453668 acres. 1 hectare = 100 ares = 10,000 m2 = 2.47105381467 acres.
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Frequently asked questions
Why is a hectare 100 ares?
The hectare was defined as a square 100 m on each side, which is 10,000 m2, and the are is 100 m2. Dividing the hectare by the are therefore gives exactly 100.
Which unit is used for farmland?
Canada and Europe commonly use hectares for farmland, while the United States and parts of Canada also use acres. Ares are less common but still appear in older European records.
Is a hectare the same as a square hectometre?
Yes. A hectometre is 100 m, so a square hectometre is 10,000 m2, which is exactly one hectare. The name hectare combines hecto with are.