Circle Calculator

The Circle Calculator is a tool that allows you to calculate various properties of a circle given one known value. It is commonly used in mathematics, engineering, and other fields that require calculations involving circles.



A circle is a two-dimensional geometric shape that consists of all points in a plane that are at a given distance from a given point, the center. The distance between any point of the circle and the center is called the radius.


The Circle Calculator uses the following standard formulas for a circle:


The area of a circle is given by the formula:


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A = πr^2

where r is the radius of the circle.


The circumference of a circle is given by the formula:

C = 2πr

where r is the radius of the circle.


The diameter of a circle is twice the radius. Therefore, it is given by the formula:

D = 2r


The Circle Calculator has several benefits:

  • Accuracy: The calculator applies correct formulas for each calculation.
  • Versatility: The calculator outputs area, circumference, and diameter from a single input.
  • Consistency: The calculator standardizes calculations between problems.
  • Accessibility: The calculator removes mental math barriers to multi-property calculation.
  • Applications: The calculator supports dimensions across scales for design, construction, etc.

Interesting Facts

  • A circle is one of the most basic geometric shapes and can be found in many everyday objects such as wheels, plates, and coins.
  • The area of a circle was first calculated by Archimedes in ancient Greece.
  • The formula for calculating the area of a circle was first written down by Euclid in his book “Elements”.
  • The circumference of a circle can be used to calculate its perimeter in geometry.
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