This circumference to diameter calculator is used to find the diameter of a circle given its circumference. Just enter the value of the circumference. Then tap or click the Calculate button. Get the result. You can also select units of measure for both input data and results. The diameter of a circle will be shown in the selected units.

C(circumference):

D(diameter):

C is a circumference of the circle

D is a diameter of the circle

Diameter = C/π =

Note: Most other calculators and programs use scientific notation for too large and too small results. And so does this calculator.

D = C/π

where D is diameter, C is circumference, and π (pi number), is the mathematical constant. The value of π is approximately 3.141592653589793