Circle Calculator

Find all properties of a circle from just a single measurement. Enter the radius, diameter, circumference, or area, and this tool will instantly calculate the remaining three values.

Circle Calculator

How to Use

  1. 1

    Select Known Value

    Choose which measurement of the circle you already know (e.g., Radius).

  2. 2

    Enter Value

    Input the numerical value of that measurement.

  3. 3

    Calculate All

    Click calculate to instantly generate the missing radius, diameter, circumference, and area.

Frequently Asked Questions

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