Circumference Calculator

Enter value and click on calculate. Result will be displayed.

Formula:
C = 2πr

Enter the radius in cm :
Result:
Circumference (cm) :
Diameter (cm) :
Area (cm2) :

A Circumference Calculator is a tool used to quickly and accurately find the circumference of a circle — the total distance around its outer edge.

Why use a Circumference Calculator?

  • Saves time: It makes calculations fast and easy without needing manual formulas.
  • Reduces mistakes: It minimizes human error in calculations.
  • Useful for real-world applications: Whether you’re measuring wheels, round tables, pipes, or any circular object, knowing the circumference helps in design, construction, and planning.

How does a Circumference Calculator work?
It uses one of the standard formulas for circumference:

  • If you know the diameter d: C = π × d
  • If you know the radius r: C = 2πr

Where:

  • C = circumference
  • π ≈ 3.14159
  • d = diameter (twice the radius)
  • r = radius (half the diameter)

You just input either the radius or the diameter, and the calculator applies the formula and gives you the circumference.

When to use a Circumference Calculator:

  • When measuring the perimeter of circular objects.
  • In construction, engineering, or crafting when dealing with circular shapes.
  • For math homework or quick problem-solving involving circles.
  • In any scenario where you need precise circular measurements.