# 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

 Input Argument type Radius Diameter Argument value Decimal places 0 1 2 3 4 6 8 10 Result Circumference Area

## Formulas for calculating circles

 Area $$\displaystyle A = r^2 · π$$ $$\displaystyle = \frac{d^2 · π}{4}$$ Circumference $$\displaystyle c = d · π$$