CC0 Usage Conditions ApplyClick for more information. About two thousand years ago, a Greek scholar named Eratosthenes used some sticks, shadows and math to calculate the circumference of the Earth.
Use this free circumference calculator to find the area, circumference and diameter of a circle.
Online circumference of a circle calculator - given a radius in mm, cm, meters, km, inches, feet, yards, miles, and others, calculate the circumference of any circle. Circumference of a circle formula and calculation steps.
The circumference of a circle is the distance around the boundary of the circle. It is the same as calculating the perimeter of any polygon such as triangle, square, and rectangle. The circumference of a circle is measured in units of meters, kilometers, inches, etc. The diagram below shows the circumference of a circle.
Use the formula C = πd to find the circumference if you know the diameter. In this equation, "C" represents the circumference of the circle, and "d" represents its diameter. That is to say, you can find the circumference of a circle just by multiplying the diameter by pi. Plugging π into your calculator will give you its numerical value, which is a closer approximation of 3.14 or 22/7. [1 ...
Circumference = π × diameter = 2 π × radius. In geometry, the circumference (from Latin circumferēns 'carrying around, circling') is the perimeter of a circle or ellipse. The circumference is the arc length of the circle, as if it were opened up and straightened out to a line segment. [1] More generally, the perimeter is the curve length around any closed figure. Circumference may also ...