Circle Area Calculator

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

Circle Radius and Diameter
Radius (in units of length):
Fill in the radius to find the area of a circle.

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) 2.
Area = 3.1416 x r2

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 32

Calculated out this gives an area of 28.2744 Square Inches.

Other Calculators of Interest:
Circle Circumference Calculator, Sphere Area Calculator, Sphere Volume Calculator

$100 Promotion

Win $100 towards teaching supplies! We want to see your websites and blogs.
$100 Promo
Enter Here

Calculator Popups

Scientific Calculator
Simple Calculator

Calculator Ideas

We use your calculator ideas to create new and useful online calculators.
Submit Calculator Idea