# Cube Calculator

URL: https://speedycalculator.com/calculators/math/cube/
Last updated: 2026-10-25

> The cube calculator finds the volume, surface area, face diagonal and space diagonal of a cube from its edge length. Type a volume to solve for the edge.

## Inputs

- Edge length (m, cm, mm, km, in, ft, yd, mi)

## Results

- Volume
- Surface area
- Face diagonal
- Space diagonal

## Formula

```
V = a³
Surface area = 6a²
Space diagonal = a√3
```

## Explanation

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)1.53.382.2511.393273.7552.734.591.136216

## Worked example

Inputs — Edge length: 3 m.

Results — **Volume = 27 m³**; Surface area = 54 m²; Face diagonal = 4.24 m; Space diagonal = 5.2 m.

## FAQ

**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.