Acres to Hectares Converter
Convert acres to hectares and hectares back to acres, with square metres and square feet.
Formula and sources updated · Data sources · 1View algorithm, constants and default inputs (JSON)
1 ha ≈ 2.4710538147 ac
About this calculator
An acre is 4,046.86 square metres and a hectare is 10,000 square metres, so a hectare is about 2.47 acres. Both are still used for agricultural land, in different parts of the world.
Worked example
calculated with the default values below
Value 10 · Direction ⇄ · Decimal places 4 · From Acres · To Hectares Result 4.0469 · Acres 10.0000 ac · Hectares 4.0469 ha · Square metres 40,468.56 m² · Square feet 435,600.00 ft²
Method and assumptions
Formula basis and scope
1 hectare = 10000 square metres; 1 international acre = 4046.8564224 square metres.
Only the displayed unit definitions are converted; rounding and measurement uncertainty are separate.
Data sources
Disclaimer
These calculators give general conversion results. Rounding and the precision of the value you enter both affect the output, so treat displayed decimals as indicative rather than exact.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
ha = ac ÷ 2.471053814671653
- ha
- area in hectares
- ac
- area in acres
1 hectare = 10,000 m² ≈ 107,639.10 ft²; 1 acre ≈ 0.404686 ha. Displayed values are rounded.
Frequently asked questions
Why is a hectare equal to about 2.47 acres, not 2?
A hectare is 10,000 m² and an international acre is 4,046.8564224 m², so 10,000 ÷ 4,046.8564224 is about 2.47105 acres. The calculator uses a conversion factor with finite decimal precision and rounds the displayed result, so use the unrounded source measurements when a boundary survey or legal document requires greater precision.