Sphere surface area
Solve sphere surface area with your values and follow each calculation step.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
A = 4πr²
Variables & units
- Radius
- cm · minimum 0, maximum 1000000
Worked example
A sphere of radius 7 cm has surface area 196π cm².
Assumptions
Use radius, not diameter.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
Calculated on your device. Your latest 100 calculations stay in this browser.