Calculate the area of a circle using our Area Calculator, or try calculating it yourself with the formulas provided.
Geometry Calculator
Enter the radius of the circle in the calculator below to calculate the area of the circle.
Calculate the area of circle
Geometry Definitions
The following is a list of definitions relating to the area of a circle.
What is area?
Area is the size of a surface.
What is a circle?
A circle is a two-dimensional shape that is created by drawing a line that is curved so that its ends meet and every point on the line is the same distance from the center.
What is the radius?
The radius is the distance from the center of the circle to any point on the outside of the circle.
Geometry Formula
The formula to calculate the area of a circle is:
A = π x r2
where...
- A = area of circle
- π = 3.141592654
- r = radius of circle
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