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Enter any one of the value (A, C, d, r) to know the other remaining terms along with their formulas.

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Calculate the total distance around a circular object. This circumference calculator helps you to find the circumference, radius, diameter, and area of any circle.

**Circumference Definition:**** **

The circumference is the linear distance around the outside of the circle.

The circumference of a circle is similar to the perimeter of a polygon. The ratio of the circumference to the diameter of a circle is always equal to π. Here we have formulas to determine the circumference of a circle along with the radius, diameter, and area.

The circumference of a circle for any given variable can be calculated using the formula:

C = 2πr = πd

**Where:**

π = pi = 3.14159

In reverse to determine the radius and diameter of a given circular shape, we can use the circumference calculator but for manual calculations here are formulas for the radius & diameter.

r = d/2

d = 2r

A = πr2 = πd2 / 4

If the diameter of a circle is 18cm, then what is the circumference of that circle?

**Solution:**

The formula to find the circumference is:

C = 2πr = πd

Insert the values into the formula:

C = 3.14 * 18cm

C = 56.52cm

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