Circumference Calculator

Math

0.0(0)

Calculates the circumference (perimeter) of a circle given its radius or diameter.

More tools:Math & Statistics Calculators

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Radius and Diameter in the units shown.

Step 2

Read Circumference (from Diameter) and Circumference (from Radius) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Small Circle

Radius: 2 cm; Diameter: 4 cm

Circumference (from Diameter): 12.56636 cm; Circumference (from Radius): 12.56636 cm

Medium Circle

Radius: 5 cm; Diameter: 10 cm

Circumference (from Diameter): 31.4159 cm; Circumference (from Radius): 31.4159 cm

Large Circle

Radius: 10 cm; Diameter: 20 cm

Circumference (from Diameter): 62.8318 cm; Circumference (from Radius): 62.8318 cm

Explore the topic

Explore More Math & Statistics Calculators

Use calculators for algebra, geometry, trigonometry, probability, statistics, averages, z-scores, tests, and graphing tasks.

Explore tools

People Also Calculate

Related Calculators

Continue with another tool on a related topic.

Math

Floating-Point Calculator

This calculator demonstrates the behavior of floating-point numbers in calculations and highlights potential precision issues due to the way computers store and manipulate these numbers. It allows you to input two numbers and an operation, then displays the result and the difference between the calculated result and a more precise value.

1,288 viewsOpen calculator

Math

Polynomial Graphing Calculator

Visualizes the graph of a polynomial function by calculating and plotting points.

1,206 viewsOpen calculator

Math

Arcsin Calculator (Inverse Sine)

Calculates the angle whose sine is a given number. The result is in radians.

1,156 viewsOpen calculator

Math

Weighted Average Calculator

Calculates the average where some data points contribute more weight than others.

1,154 viewsOpen calculator