Circle Calculator

A free online circle calculator is used to calculate the radius, circumference, area and diameter of a circle along with the formula of the circle.

Radius of a circle:



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What is Circle

A circle is a closed plane curve that divides the plane into two regions, an interior and an exterior, such that every point on the curve is at a fixed distance from a fixed point. The fixed point is called the centre and the distance is called the radius.

Circle Formula:-

  • Area of circle = πr²
  • Circumference of circle = 2πr
  • diameter of circle = 2r

How to solve a circle problem

Example.:-Circle of Radius = 10 cm, find the area of a circle, the circumference of the circle and the diameter of the circle Area of the circle = πr² = 314.15927 cm²

Area of circle = πr² = 314.15927 cm²

Circumference of circle = 2πr = 62.83185 cm

Diameter of circle = 2r = 20 cm

See here the table of circle value


What is Circle Calculator

A circle calculator is a simple online tool to calculate the area of a circle given the radius. The calculator can be used to find the area of a circle from any sized radius. After typing the required input you will see the results in the form of a circle area equivalent to the radius you have entered. The formula for calculating the area of a circle is A = πr² where r is the radius.

How to use this circle calculator

Enter only the radius value in the proper input field and then click calculate, you see calculate the value in the answer box with the formula but if you want to enter another value so first clear the entered value then after entering the new radius value.