Finding the Volume of a Cube
(KS3, Year 8)

The Lesson

The volume of a cube is found using the formula:

In this formula, a is the length of each side of the cube. The image below shows what we mean by the length of the side:

"Find the Volume" Widget

Here is a widget to help you learn the formulas to find the volumes of different shapes.

How to Find the Volume of a Cube


What is the volume of a cube with sides of length 6 cm, as shown below?



Start with the formula:
Volume = a3
Don't forget: a3 = a × a × a (a cubed).


Substitute the side length into the formula. In our example, a = 6.
Volume = 63 = 6 × 6 × 6 = 216 cm3


The volume of the cube with sides of length 6 cm is 216 cm3.

Lesson Slides

The slider below shows another real example of how to find the volume of a cube. Open the slider in a new tab

What Is a Cube?

A cube is a box-shaped object. It is made of six identical square-shaped faces.

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See Also

Finding the volume of sphere Finding the volume of a cylinder Finding the volume of a cone