Circumference calculator

The following circumference calculator is easy to use. Just enter the value of the radius and hit calculate button.

Recall that the formula to get the circumference of a circle  

is 2 ×pi×r with r = 3.141592653589793

Therefore, the circumference depends only on the size of r. That is why you only need to enter r here to get the circumference

The calculator will only accept positive value for r since a distance cannot be negative

As a reminder, if r = 4 cm for instance,

circumference = 2 ×3.14 ×4 = 25.12 cm

Enter the radius of the circle:     


The result is :  

Buy a comprehensive geometric formulas ebook. All geometric formulas are explained with well selected word problems.

Need a math tutor?
Get an answer in 10 minutes or less from a math expert!

Justanswer features top-notch math experts handpicked by personnel after they have taken and passed a rigourous math test and after their credentials have been verified by a third party

Most math experts have bachelor's or master's degree in math or a related field

Ask a Math Tutor or Teacher Now

We have partnered with JustAnswer so that you can get an answer ASAP.


New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.

Page copy protected against web site content infringement by Copyscape

Recent Articles

  1. Proof of the Law of Sines

    Oct 24, 16 06:10 PM

    Straightforward proof of the law of sines. Easy to follow and understand

    Read More