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Circle Calculator

Explore radius, diameter, circumference and area.

● Live results · Runs on your device · No sign-up

Your inputs

Area = πr²; circumference = 2πr.

Live results

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Result visualization

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Circle Calculator guide

Explore radius, diameter, circumference and area.

How to use this tool

  1. Enter Radius.
  2. Change a value to update the results and illustration. Check any validation message before using the output.
  3. Copy the results or download CSV. Reset restores the example values.

A worked example

Radius 5 gives diameter 10, circumference about 31.4159 and area about 78.5398.

How it works

Area = πr²; circumference = 2πr.

Frequently asked questions

How should I interpret the illustration?

It is a visual aid, not a replacement for the numeric output. Some charts compare values with different units, and those magnitudes are not directly comparable.

Can I use the result without checking the inputs?

Check units, signs, assumptions and rounding first. The tool cannot know whether the values you enter describe the real situation correctly.