Find the surface area of common 3D shapes with formulas, step-by-step calculations, and diagrams.
Select a Shape
Cube
Rectangular Prism
Sphere
Cylinder
Cone
Triangular Prism
Square Pyramid
Ellipsoid
Enter Dimensions
Diagram
About Surface Area
Surface area measures the total outer area of a 3D object, expressed in square units. It is useful for construction, packaging, and physics.
Example 1: Wrapping a Box
The amount of wrapping paper needed to cover a gift box is equal to the surface area of the rectangular prism.
Example 2: Painting a Sphere
The amount of paint required to cover a spherical object depends on its surface area.
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