Find the area of a circle by using this online Circle Calculator.

## Area of a Circle Radius and Diameter

## How do you find the area of a circle?

Find the area with this circle area formula:

Multiply Pi (3.1416) with the
square of the radius (r).

Area = 3.1416 x
r squared

The radius can be any measurement of
length.

This calculates the area as square units of the length used in the radius.

Example: The area of a circle with
a radius(r) of 3 inches is:

Circle Area = 3.1416 x 3 squared

Calculated out
this gives an area of 28.2744 Square Inches.