Sphere Calculator

A sphere’s volume is ⁴⁄₃πr³ and its surface area 4πr². The calculator also gives the hemisphere, common in Class 9 and 10 problems.

You know the
Results update as you type.

Volume

1,436.75504

Surface area
615.7521601
Hemisphere volume
718.3775201
Hemisphere total surface
461.8141201

About this calculator

Enter the radius or diameter.

How to use it

  1. Choose radius or diameter.
  2. Enter it.
  3. Read the results.

The formula

V = ⁴⁄₃πr³; surface = 4πr²
hemisphere TSA
3πr²

Worked example

Radius 7

  1. Volume ≈ 1,436.76.
  2. Surface area ≈ 615.75.

What the result means

Doubling the radius makes the volume eight times larger.

Assumptions

  • All lengths in the same unit.

Limitations

  • Results are rounded to 10 significant figures.

Frequently asked questions

What is the volume of a sphere?

⁴⁄₃πr³.

What is the surface area?

4πr².

What is the TSA of a hemisphere?

3πr², including the flat circle.

Last reviewed on 3 October 2026. Found a mistake? Tell us.