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 =
Area of Circle: [πr² ]

Enter the radius =

Area of Circle =
Circumference of Circle:[ 2πr ]

Enter the radius =

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

Enter the radius =

Enter the angle =

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