Sphere Calculator
Enter a sphere's radius, diameter, circumference, surface area, or volume. The calculator instantly finds all remaining measurements with clear formulas and steps.
Choose radius, diameter, circumference, surface area, or volume.
Provide a positive measurement and choose your preferred unit.
See every sphere dimension, formulas, and calculation details.
C = 2πr
A = 4πr²
V = 4⁄3πr³
From r = 5 cm: diameter = 2 × 5 = 10 cm; circumference = 2π × 5 = 31.416 cm; surface area = 4π × 5² = 314.159 cm²; volume = 4⁄3π × 5³ = 523.599 cm³.
A sphere is a perfectly round three-dimensional object whose surface points are all the same distance from its center. That fixed distance is the radius.
What is the difference between radius and diameter?
The radius runs from the center to the surface. The diameter crosses the sphere through its center and equals twice the radius.
How do I find the volume of a sphere?
Use V = 4⁄3πr³, where r is the radius.
How do I find sphere surface area?
Use A = 4πr². Surface area is expressed in square units.
Can I start with volume or surface area?
Yes. Select the known measurement and the calculator will solve backward to find the radius and all other values.
Results are estimates generated locally in your browser using standard mathematical formulas. They are for informational and educational purposes only and are not a substitute for verification in coursework, examinations or professional contexts requiring certified accuracy. VisionVix accepts no liability for decisions based on this tool's output.
This calculator is intended for educational and general measurement purposes. Results are rounded numerical estimates and should be independently verified for precision-critical work.
