Home› Conversions› Area› Acres to Hectares
Area
Acres to Hectares
Convert acres (ac) to hectares (ha). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 ac = 0.404686 ha
Acres to Hectares Conversion Table
Common values, ready to copy:
| acres | hectares |
|---|---|
| 1 ac | 0.404686 ha |
| 2 ac | 0.809372 ha |
| 5 ac | 2.0234 ha |
| 10 ac | 4.0469 ha |
| 25 ac | 10.1172 ha |
| 50 ac | 20.2343 ha |
| 100 ac | 40.4686 ha |
| 1,000 ac | 404.69 ha |
Formula
hectares = acres × 0.404686
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
About Acres and Hectares
Acres (ac): An old English unit, originally the area a yoke of oxen could plow in a day; standardized at exactly 4,046.86 m² (43,560 sq ft). Common uses: Land area in the US, UK, and most former British colonies — farm sizes, residential lots, and ranch acreage.
Hectares (ha): Ten thousand square meters, or 100 m × 100 m; from the Greek hekaton meaning hundred (referring to the hundred-fold of an are, an obscure unit). Common uses: Land area in metric countries — agriculture, forestry, real estate (especially rural), and conservation.
How the conversion works
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
The exact relationship is hectares = acres × 0.404686, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between acres and hectares comes up wherever area measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.