Circumference calculatorThe 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 Fun math game: Destroy numbered balls by adding to 10





  
Are you a fan of this site? Support us Our awards! Our partners About me Disclaimer Build your website! Advertise on my site Try our free toolbar Like us on Facebook Take our survey 