r D C A
Radius (r)
Diameter (D)
Area (A)
Result unit
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Table of contents:

  1. Circumference of a Circle Calculator
  2. Definition of circumference
  3. Parts of a Circle
  4. Formula for circumference

Definition of circumference

Circumference is the perimeter of a circle or ellipse.

Parts of a Circle

Parts of a Circle

  • r – Radius
  • D – diameter
  • C – Circumference
  • A – Area

Formula for circumference

  • If given Radius of a circle (r):

    {C = 2\pi r}

  • If given Diameter of a circle (D):

    {C = \pi D}

  • If given Area of a circle (A):

    {C = 2\pi \sqrt{\dfrac{A}{\pi}}}

Where π is a constant approximately equal to 3.14159.

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