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Circle Calculator

A circle is the set of all points in a plane at a fixed distance, called the radius, from a given point, the centre. Here you can calculate the area, diameter, circumference of a circle and also area of a sector.

Circle Calculator

Diameter of Circle: [ 2r ]

  • Enter the radius =

  • Diameter of Circle =

    indication

Area of Circle: [πr² ]

  • Enter the radius =

  • Area of Circle =

    indication

Circumference of Circle:[ 2πr ]

  • Enter the radius =

  • Circumference of Circle =

    indication

Area of Sector: [ ½×arc×(angle in degree) ]

  • Enter the radius =

  • Enter the angle =

  • Result Area =

    indication

This tool is an online utility. You can dynamically calculate the area, diameter, circumference of a circle and also area of a sector.