How to use this calculator
Calculate volume and surface area for a sphere from its radius.
How the calculation works
- Enter radius.
- The calculator applies sphere volume and surface area formulas.
- Results are shown with pi-based decimal values.
Formula
Volume = 4/3πr³. Surface area = 4πr².
Example
A sphere with radius 1 has volume 4.18879 and surface area 12.56637.
Understanding your result
Use the output as a practical starting point, then review it before using it in an important workflow.
Assumptions and limitations
- Radius cannot be negative.
- Use Circle Calculator for 2D circle area and circumference.
Frequently asked questions
Does this require an account?
No. The core tool works without creating a Tool2Do account.
Is my input included in share links or analytics?
No. Tool2Do share actions use the tool page URL and safe metadata, not private values or uploaded files.