Radius of a Sphere Calculator

Calculate Your Sphere's Radius

For volume, input value should be in cubic units (e.g., cm³). For surface area, square units (e.g., cm²). The radius will be in the selected linear unit.

Unlock the secrets of spherical geometry with our free Radius of a Sphere Calculator. Whether you have the volume or surface area, effortlessly determine the sphere's radius. Ideal for students, engineers, and designers needing quick, accurate calculations for any sphere-related project or problem.

Formula:

The radius of a sphere (r) can be calculated using its volume (V) or its surface area (A). Here are the formulas, where π (Pi) is approximately 3.14159:

From Volume: r = ∛(3V / 4π)
Or, more simply written as: r = (3V / 4π)1/3

From Surface Area: r = √(A / 4π)
Or, more simply written as: r = (A / 4π)1/2

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