Case 1
- Edge length
- 3
27.0000
Open with these valuesCube Volume Calculator
27.0000units³
Result: 27.0000 units³One edge decides everything: volume s³, surface 6s², face diagonal s√2, body diagonal s√3. Halving the edge leaves an eighth of the volume, not half — the table below shows it at 0.5 against 1.
Worked examples
Case 2
- Edge length
- 1
1.0000
Open with these valuesCase 3
- Edge length
- 5
125.0000
Open with these valuesHow it's calculated
V = s³
- StepMeasure one edge — all twelve are the same.
- StepEnter it in any length unit.
- ResultRead the volume in the cube of that unit.
Reference table
| Edge | Surface area | Volume |
|---|---|---|
| 0.5 | 1.5 | 0.125 |
| 1 | 6 | 1 |
| 2 | 24 | 8 |
| 3 | 54 | 27 |
| 5 | 150 | 125 |
Questions
How do you find the volume of a cube?
Multiply the edge by itself three times. An edge of 3 gives 27 cubic units.
What is the surface area?
Six equal square faces, so 6s². An edge of 3 gives 54 square units, listed in the table above for each edge shown.
How long is the diagonal through the middle?
s√3, about 1.732 times the edge. The diagonal across one face is shorter, s√2 or about 1.414 times the edge.
Why does a smaller cube lose so much volume?
Because the edge is cubed. Halving it leaves 0.5³ = an eighth, which is why 0.5 gives 0.125 rather than 0.5.
Sources and last check
Information, not professional advice.