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Area of a Sphere Calculator.

Calculate sphere surface area and volume from radius.

On-device calculationNo signup
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Set your values

Results update as you type.

Surface area: 314.159265 units²

Surface area

314.159265units²
Volume: 523.598776 units³

Volume

523.598776units³

Results update automatically as you type.

Use Cases

Math and Geometry Homework

Check your answers for sphere surface area and volume problems. Enter the radius to verify your calculations.

Example: Find the surface area of a sphere with radius 5 cm.

Engineering and Design

Quickly estimate material needs or capacity for spherical objects like tanks or balls.

Example: Calculate the volume of a spherical tank with radius 2 meters.

Frequently Asked Questions

How do I calculate the surface area of a sphere?
Enter the radius of the sphere into the calculator. The surface area is computed using the formula 4πr², where r is the radius. The result is displayed in square units.
What is the formula for the volume of a sphere?
The volume is calculated using the formula (4/3)πr³, where r is the radius. Enter the radius to get the volume in cubic units.
Can I use this calculator if I only know the diameter?
This calculator requires the radius. If you have the diameter, simply divide it by 2 to get the radius, then enter that value.

Tips & Common Mistakes

Tips

  • Ensure the radius is in the same unit system (e.g., all in meters or all in centimeters) to get consistent area and volume units.
  • Use the formula 4πr² for surface area and (4/3)πr³ for volume. This calculator does the math for you.
  • If you have a diameter, halve it to get the radius before entering it.
  • Double-check your radius value for accuracy, as small errors can significantly affect volume calculations.

Common Mistakes to Avoid

  • Entering the diameter instead of the radius. Remember to divide the diameter by 2.
  • Confusing surface area and volume units: surface area is in square units, volume in cubic units.
  • Using an inconsistent unit system, such as mixing meters and centimeters, which leads to incorrect results.

Last updated: August 13, 2026