Circle and Sphere Online Calculator

This free calculator can be useful when you know one of the components of a circle or sphere and want to determine the others. Insert one of the elements of a circle (radius, diameter, circumference, area) or sphere (area, volume) to calculate the others.

Circle Calculator

Select Circle value to input: Radius Diameter Circumference Area

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Circle & Sphere Formulas

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Sphere Calculator

Select Sphere value to input: Radius Surface Area Volume