Surface Area Calculator
Find the total and curved surface area of a cube, box, cylinder, sphere, cone or hemisphere.
Cube: side. Box: length. Cylinder, sphere, cone, hemisphere: radius.
Total surface area
245.0442 square units
- Curved surface only
- 188.4956
The cylinder has a total surface area of 245.0442 square units, of which 188.4956 is the curved surface.
How it's worked out
- Cylinder surface
2πr² + 2πrh245.0442
- Use the same unit for every measurement; the answer is in that unit squared. Handy for paint, wrapping or insulation.
The formulas
Cube 6a² · Box 2(lw + lh + wh) · Cylinder 2πr² + 2πrh · Sphere 4πr² · Cone πr² + πrl · Hemisphere 3πr²
Worked example
A cylinder of radius 3 and height 10: 2π × 9 + 2π × 30 = 78π ≈ 245.04 square units, of which the curved side is 60π ≈ 188.50.
Questions people ask
What is the surface area of a cylinder?
2πr² for the two ends plus 2πrh for the curved side. A cylinder of radius 3 and height 10 has 78π ≈ 245.04 square units.
What is the surface area of a sphere?
4πr².
What is the surface area of a cone?
πr² for the base plus πr × the slant height, where the slant is √(r² + h²).
About this calculator
Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem