How to use the Surface Area Calculator
The surface area calculator finds the outer area of common 3D shapes.
Open the Surface Area Calculator →
What you need to enter
- Shape
- a
- b
- c
The formula
Cube 6a²; box 2(ab + bc + ac); sphere 4πr²; cylinder 2πr(r + h); cone πr(r + √(r² + h²)).
Worked example
Using the default values in the calculator:
- Shape: Cube (a)
- a: 3
- b: 4
- c: 5
| Surface area | 54 |
Tips for better results
- Use the same unit throughout.
- Area is in square units.
Common mistakes to avoid
- Using diameter for radius.
- Forgetting the base of a cylinder.