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About the Surface Area Calculator
The Surface Area Calculator computes the total surface area of common 3D shapes, including spheres, cylinders, cones, cubes, and prisms. Enter your dimensions and the tool returns the total area in square units. Each result uses the exact geometric formula for the shape you select.
Each shape follows its standard formula: a sphere uses 4πr², a cube uses 6a², a cylinder uses 2πr² + 2πrh, and a cone uses πr² + πrl. Prisms use 2B + Ph, where B is the base area, P is the base perimeter, and h is the height. You enter simple dimensions such as radius, height, side length, or slant height, depending on the shape. Keep all measurements in the same unit, and measure the radius as half the diameter so the result is not doubled.
- Select your 3D shape from the list.
- Enter the required dimensions, such as radius and height.
- Read the total surface area shown in square units.