A cube has six identical square faces, so one measurement defines it completely.
How to use the Cube Calculator
- Edge length
- Want to work backwards? Type a value into Volume and Edge length is calculated for you.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Cube the edge length for volume and multiply the area of one face by six for surface area.
What each result means
- Volume = [Edge length]^3
- Surface area = 6×[Edge length]^2
- Face diagonal = [Edge length]×sqrt(2)
- Space diagonal = [Edge length]×sqrt(3)
Example values
How the main result changes when Edge length changes and everything else stays at the example values above:
| Edge length (m) | Volume (m³) |
|---|---|
| 1.5 | 3.38 |
| 2.25 | 11.39 |
| 3 | 27 |
| 3.75 | 52.73 |
| 4.5 | 91.13 |
| 6 | 216 |
Formula
V = a³Surface area = 6a²Space diagonal = a√3Worked example
Inputs — Edge length: 3 m.
Results — Volume = 27 m³; Surface area = 54 m²; Face diagonal = 4.24 m; Space diagonal = 5.2 m.
Frequently asked questions
How many litres is a 1 m cube?
1,000 litres.
What is a cube root?
The edge length of a cube with a given volume.
What formula does the Cube Calculator use?
V = a³.
Can I work backwards from the result?
Yes. Type the result you want into Volume and the calculator finds the matching edge length.