Circumference: Use this free circumference

Use this free circumference calculator to find the area, circumference and diameter of a circle. The circumference to diameter calculator can help you solve the geometry problem of finding the diameter of a circle by inputting its circumference . This calculator works both ways, so you can also convert a diameter to a circumference . Keep reading to learn more about: The circumference to diameter formula. How to calculate circumference from the diameter. How to get diameter from the circumference . The circumference of a circle is equal to the length of its boundary, but the circle is a curved shape, its circumference can't be measured with a ruler. The correct way to find the perimeter of a circle is to calculate it using the formula C = 2π × r. The circumference of a circle is the distance around it, but if, as in many elementary treatments, distance is defined in terms of straight lines, this cannot be used as a definition.