Surface Area Calculator

Calculate the surface area of 3D shapes: cube, sphere, cylinder, cone, and rectangular prism.

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Frequently Asked Questions

Q.What is surface area?

Surface area is the total area of all outer faces of a 3D object. It determines how much material is needed to cover an object.

Q.What is the surface area of a sphere?

SA = 4πr². For a sphere with radius 5: SA = 4 × π × 25 ≈ 314.16 square units.