How it works
Volume = edge × edge × edgesurface area = 6 × edge²
- edge
- the length of one side
- Volume
- the space inside, in cubic units
- surface area
- the six faces added up
To go from a volume back to the edge, take the cube root: a 27-cubic-unit cube has an edge of 3.
Frequently asked questions
What is the volume of a cube with edge 4?
64 cubic units, from 4 × 4 × 4.
How do I find the edge from the volume?
Take the cube root of the volume. A volume of 125 means an edge of 5.
What is the surface area of a cube?
Six times one face, or 6 × edge², because a cube has six equal square faces.
Is a cube a rectangular box?
Yes, a cube is a box with all edges equal, so length × width × height still holds.