Area of a circle calculator

The following area of a circle calculator will help you find the area of any circle when the radius is given. Just enter the value of the radius and hit calculate button.

Enter the radius of the circle:     

       

The result is :  

Recall that the formula to get the area of circle  

is pi × r2 with pi = 3.141592653589793

Therefore, the area depends only on the size of r. That is why you only need to enter r here to get the area

The calculator will only accept positive value for r since a distance cannot be negative

As a reminder, if r = 3 cm for instance,

Area = 3.14 × 32 = 3.14 ×9 = 28.27 cm2

Buy a comprehensive geometric formulas ebook. All geometric formulas are explained with well selected word problems so you can master geometry.

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