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Surface Area Calculator

Calculate the total outer surface area of a cube, box, sphere or cylinder, with a 3D sketch.

How it works Report a problem

Surface Area

Calculate outer boundary area of 3D objects

About the Surface Area Calculator

Calculate the total outer surface area of a cube, box, sphere or cylinder, with a 3D sketch.

How to use the Surface Area Calculator

  1. Choose a shape: Cube, Rect Box, Sphere or Cylinder.
  2. Enter the dimensions shown.
  3. Press Solve & Sketch 3D.

Formula and method

Cube: 6s². Box: 2(lw + lh + wh). Sphere: 4πr². Cylinder: 2πr(r + h).

Worked example

A cube with side 4 has a surface area of 6 Ă— 16 = 96 square units.

Tips

  • Surface area tells you how much paint or wrapping you need.

Frequently asked questions

What is the difference between surface area and volume?
Surface area is the size of the outside, in square units. Volume is the space inside, in cubic units.