Cubes and cube roots

Cube, then undo it

x³ multiplies a number by itself twice: 2 × 2 × 2 = 8. ³√x reverses that calculation. Press 2nd → x³ to cube, or 2nd → ³√x for cube root.

Try it · a cube with 2 m sides

Use 2nd if m is above its key.

1. Start fresh

   Press Clear entry, then Clear entry, then Select length units.C→C→Length

2. Enter one side and cube it

   Press 2, then meters, then Second, then Cube.2→m→2nd→x³

Get the side back

1. Take the cube root

   Press Second, then Cube root.2nd→³√x

Also useful for

Cube-shaped bins, boxes and forms. Cubing a scale ratio also tells you how volume changes when every dimension scales equally.

Remember

The side-from-volume shortcut works only for a cube. For a rectangular box, multiply length × width × height. Cube root is not volume ÷ 3.

Start a new calculation

1. Press Clear entry, then Clear entry.C→C

Calculate

1. Number

   Press 10, then Second, then Cube.10→2nd→x³

Start a new calculation

Use 2nd if a unit is above its button.

1. Start fresh

   Press Clear entry, then Clear entry.C→C

2. Press the keys

   Press Select length units.Length

Calculate

1. Length

   Press 3, then meters, then Second, then Cube.3→m→2nd→x³

Start a new calculation

1. Press Clear entry, then Clear entry.C→C

Calculate

1. Number

   Press 100, then Second, then Cube root.100→2nd→³√x

Start a new calculation

1. Press Clear entry, then Clear entry.C→C

Calculate

1. Volume

   Press 2028, then Select volume units, then Cubic inches, then Second, then Cube root.2028→Volume→in³→2nd→³√x