Circle Calculator

Calculate the Area, Diameter, Circumference and Sector area of circle for given values.

Diameter of Circle: [ 2r ]

Area of Circle: [πr² ]

Circumference of Circle:[ 2πr ]

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

Computes the Diameter, Area of Circle, Circumference of Circle and Area of Sector for given values.

The locus of points equidistant from a given point is a circle or we can say the circle is the set of all points equidistant from a central point.

The distance around the edge of the circle is called Circumference.

The distance from the center to the edge is called Radius.

Diameter starts at one side of the circle and passes through the center and ends on the other side.


π = pi = 3.1415926535898
Radius (r):
r = d/2

Diameter (d) :
d = 2r

Area of a circle (A):
A = πr2 = πd2/4

Circumference of a circle (C):
C = 2πr = πd