![]() Radius: The distance from the center of the circle to its edge.It can also be understood as the circle's perimeter. ![]() Circumference: The distance once around the circle.We suggest working out some problems on your own and using the calculator to check your answer, as it provides you with a solution for each problem but will not show you the work that goes with it. If you only have the diameter of a circle and would still like to use this calculator, you can find the radius by dividing the diameter in half. You can also calculate the circumference of a circle using the diameter, with the equation C = Π * d. The equation used to find circumference is C = 2Πr, where C stands for circumference, R stands for radius, and Π is Pi, a mathematical constant equivalent to approximately 3.14 (see more below). Whichever unit the radius is measured in will also be the unit the circumference is calculated in. The circumference can be measured in any unit or system that traditionally measures length - imperial (inches, feet, etc.) or metric (centimeters, meters, etc.). If you were to cut a circle and lay the outline flat, the length of the line it created would be its circumference. It can be compared to finding the perimeter of a shape (although the word perimeter is reserved specifically for polygons). The circumference of a circle is the measurement around a circle's edge. Try our Circumference Calculator now! Enter the radius of the circle:Īnd if you're not sure what the radius is or how to find it, we'll walk you through some of the basics of finding a circle's circumference below. Simply enter the radius of the circle and hit “calculate.” You can click the “reset” button if you need to clear the circumference calculator in order to find the answer for another circle. Use our Circumference Calculator to determine the circumference of a circle.ĭoes calculating circumference have you running in circles? Our circumference calculator is an easy way for you to find the circumference of any circular object.
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