Acres to hectares
Unit conversionHow many hectares is an acre?
Multiply acres by 0.40468564224 to get hectares, or enter any area to convert it.
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Result
0.4047 ha
1 acre is about 0.4047 hectares
- The other way round: 1 ha ≈ 2.471 ac.
- Exact by definition: 1 ha = 10,000 m².
In all units
- Square millimetres
- 4,047,000,000 mm²
- Square centimetres
- 40,470,000 cm²
- Square metres
- 4,047 m²
- Ares
- 40.47 a
- Hectares
- 0.4047 ha
- Square kilometres
- 0.004047 km²
- Square inches
- 6,272,640 in²
- Square feet
- 43,560 ft²
- Square yards
- 4,840 yd²
- Acres
- 1 ac
- Square miles
- 0.0015625 mi²
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Multiply acres by 0.40468564224 to get hectares, or enter any area to convert it.
How to use
- Type the area you want to convert.
- Choose the units to convert from and to. Use the swap button to flip them.
How it works
Every unit is converted through square metres using exact definitions: a hectare is 10,000 m², an are is 100 m² (the Finnish “aari”, the same unit), a square foot is exactly 0.09290304 m² because a foot is 0.3048 m, and an acre is 43,560 square feet or exactly 4,046.8564224 m². So 1 acre is about 0.4047 ha, and 1 m² is about 10.764 sq ft.
The definitions come from NIST Special Publication 811 and the UK Weights and Measures Act 1985. The hectare and the are are metric units accepted for use with the SI.
The acre here is the international acre. The older US survey acre differs by about 0.0004 %, which only matters in land surveying.
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