Free · Area conversions

Hectares to International Acres Conversion Calculator

Convert hectares to international acres with exact unit factors, editable results and an explained example.

Formula & worked example
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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

0.40468564224 ha = 1 acre. Hectares and acres both measure area. They do not specify the length, width or shape of a parcel. Enter a known value in the units shown; editing a result solves the conversion in reverse.

0.40468564224 ha = 1 acre

Worked example

Enter these known values and leave the other values blank.

Hectares: 0.40468564224 ha

Acres: 1 ac

Assumptions and limitations

Hectares and acres both measure area. They do not specify the length, width or shape of a parcel.
The worked example uses the starting units. A unit selection preserves the quantity, so check the unit before entering a new number.
International acres and feet are used. A historical survey-foot acre needs a separate conversion.

Common questions

Which area convention does this conversion use?

Hectares and acres both measure area. They do not specify the length, width or shape of a parcel.

How should I use a rounded result?

Keep enough digits for the accuracy of the original measurement. Display rounding changes the visible precision, while the calculation retains additional digits.

References

The international acre is exactly 43560 square international feet; Bookify replaces the rounded captured area factor.

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