Circle circumference and area

Calculators and formulas for calculating circumference and area of circle

Circle online calculator

This function calculates the area and the perimeter of a circle from a given circle property.

Enter one of the circle property, then click the 'Calcutate' button.

Circle Calculator

Argument type
Argument value

Decimal places

Formulas for calculating circles

calculating area Area \(\displaystyle A = r^2 · π\) \(\displaystyle = \frac{d^2 · π}{4}\)
calculating perimeter Circumference   \(\displaystyle c = d · π\)

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