Free · Area conversions
International Acres & Ares Converter
Convert international acres & ares using exact area factors and an editable worked example.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
1 acre = 40.468564224 ares. An are is exactly 100 m²; a hectare contains 100 ares. The word are is a unit name, not an abbreviation for acre.
1 acre = 40.468564224 ares
Worked example
Enter these known values and leave the other values blank.
- Area in acres
- 1 ac
- Area in ares
- 40.47 a
Assumptions and limitations
- Uses the international foot and acre, with one acre equal to 43,560 square feet. Area conversion does not determine a parcel’s shape or legal boundaries.
- An are is exactly 100 m²; a hectare contains 100 ares. The word are is a unit name, not an abbreviation for acre.
Common questions
Does this find the length or width of a plot?
No. It converts an area already known. Many different shapes and dimensions can enclose the same area.
Which area convention is used?
Uses the international foot and acre, with one acre equal to 43,560 square feet. Area conversion does not determine a parcel’s shape or legal boundaries.
References
The international acre is exactly 43560 square international feet; Bookify replaces the rounded captured area factor.
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