How to convert acres to hectares
Formula: ha = acres × 0.4046856. Worked example: 10 acres = 4.046856 ha. Quick estimate: multiply by about 0.4 — the error is 1.2%, fine for everyday use but not for engineering or shopping by exact size.
About these units
A hectare is 10,000 m² (a 100 × 100 m square). An acre is 4,046.8564224 m², about 40% of a hectare. Acres are used for land and farm sizes in the US and UK; hectares are used almost everywhere else.
Category: area. Results on this page are calculated in your browser and rounded to 7 significant digits; the table above uses 6. For other units of area open the full unit converter, or use the reverse page — hectares to acres.