MATH
Solid Surface Area Calculator
Choose a supported solid and use one length unit.
Your result
MATHEnter your values and select calculate.
On this page How it works & practical examples
How to use the Solid Surface Area Calculator
Choose a supported solid and use one length unit. Sphere uses only radius a; cylinder uses radius a and height b; box uses all three dimensions.
The calculation
Box: 2(lw+lh+wh); sphere: 4πr²; closed cylinder: 2πr(r+h)
Worked example
A closed 3×4×5 box has total surface area 94 square units.
Assumptions and limits
Ideal outer surface of a closed solid. Wall thickness, open ends, seams and irregular shapes are not included; unused inputs are ignored.
Common questions
Which inputs should I use?
Choose a supported solid and use one length unit. Sphere uses only radius a; cylinder uses radius a and height b; box uses all three dimensions.
What does the result exclude?
Ideal outer surface of a closed solid. Wall thickness, open ends, seams and irregular shapes are not included; unused inputs are ignored.