Surface Area Calculator
Free surface area calculator for 3D shapes: cube, sphere, cylinder, cone and box. Enter the dimensions and get the exact surface area instantly.
About this tool
Surface area is the total area of all faces of a 3D object - the paint needed for a box, the wrapping paper for a ball, the material for a cylindrical tank.
Select the shape, enter its dimensions, and this surface area calculator returns the exact figure instantly.
How to use
Choose cube, sphere, cylinder, cone or box, then fill in only the matching fields. A sphere needs just the radius; a box needs length, width and depth.
Press Calculate Surface Area and the answer appears in square units of your measurements.
The math behind it
Cube: 6 x side^2. Sphere: 4 x pi x r^2. Cylinder: 2 x pi x r x (h + r). Cone: pi x r x (r + slant height). Box: 2 x (lw + lh + wh).
Surface area is always in square units - square centimetres, square inches, square feet - matching whatever unit you measured in.
Frequently asked questions
What is the difference between surface area and volume?
How do I find the surface area of a cylinder?
What units should I use?
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