Circumference Calculator

By Anowar

Reviewed by Jasmine

To calculate the circumference of a circle, choose an input type, such as radius or diameter, and then enter a value. Next, click the "Calculate" button to see the results below.

Circumference
15.708 cm
Area
78.540 cm²
Diameter
10.000 cm
Radius
5.000 cm
d r

What is Circumference?

The circumference of a circle is the total distance around its outer edge. It's similar to the perimeter of a polygon, but it also applies to circles. Simply put, it's the length of the area that wraps around the circle once.

Circle Calculation Formulas

The formulas for calculating the circle are given below:

  • Circumference (C): C = π × d or C = 2 × π × r
  • Area (A): A = π × r²
  • Diameter (d): d = 2 × r
  • Radius (r): r = d ÷ 2

Note: The value of pi (π) is approximately 3.14159.

How to Calculate Circumference?

You can calculate the circumference of a circle using two main formulas. Diameter and radius are two options for calculating a circle:

  • Using Radius (r):

    C = 2 × π × r

    Where:

    • C is the circumference
    • r is the radius of the circle
    • π (Pi) is approximately 3.14159
  • Using Diameter (d):

    C = π × d

    Where:

    • d is the diameter of the circle. Therefore, the calculation for circumference is - C = 3.14159 (pi) × 10 = 31.4159

These are the two main formulas used to calculate the circumference, area, diameter, radius of a circle.

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Anowar Hossain

Anowar Hossain

Web Developer

With over 10 years of experience in mathematical applications and web development, I create user-friendly tools that simplify everyday calculations. My expertise in accurate calculators that accessible to everyone.

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