# Circle Area Calculator

This free online calculator will help you to find the area of a circle, when you know the langth of circle radius or circle diameter.

Using this online calculator, you will receive a detailed step-by-step solution to your problem, which will help you understand the algorithm how to find circle area.

## Calculation of Circle Area

Select defined data

r =

r =

π =

Area inYou can input only integer numbers, decimals or fractions in this online calculator (-2.4, 5/7, ...). More in-depth information read at these rules.

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See also
Circle, segment, sector: formulas and properties
Area Formulas for Geometric Figures.
Length and width converter
Area converter
Perimeter calculators

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