Surface Area of a Sphere Calculator
🧊 Volume & surface area (3D). Use the Surface area of a sphere formula to find surface area, radius: pick the value you want, type the others, and the answer updates as you go.
Surface area314.16 cm²
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Surface area | cm² |
| Radius | cm |
Worked example
Find the surface area when Radius = 5 cm.
Using SA = 4π r²: Surface area = 314.16 cm².
Frequently asked questions
What is the formula for Surface area of a sphere?
SA = 4π r².
What do the letters stand for, and what units are used?
Surface area in cm², Radius in cm.
How do you calculate surface area?
Put the values into SA = 4π r². For example, with Radius = 5 cm, surface area = 314.16 cm².
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (surface area, radius) and fill in the others: it rearranges the formula for you.
