Cube Root Online – Calculate ∛ of a Number

The calculator automatically computes the cube root of the number you enter. The notation is ∛. For example, the notation for the cube root of 8 is ∛8.

What is a cube root?

The cube root of a number 'x' is the number 'y' which, multiplied by itself three times, gives the number 'x'. For example ∛8 = 2 because 2 × 2 × 2 = 2³ = 8. More generally, if ∛x = y then y³ = x.

Negative numbers

Unlike the square root, the cube root of a negative number is a negative real number. For example:

• ∛(-8) = -2 (because (-2)³ = -8)
• ∛(-27) = -3 (because (-3)³ = -27)
• ∛(-64) = -4 (because (-4)³ = -64)

The cube root therefore works with both positive and negative numbers, unlike the square root which requires complex numbers for negative values.

Example

For example, to calculate the cube root of 8, enter 8 in the corresponding field and the result will appear.

Keyboard shortcuts for the cube root

m ⇝ Clear

f ⇝ Save

Save your results

To keep the results you obtain, press the Save button. Your data will then be stored.

Export to CSV

You can export your saved results in CSV format, which makes it easy to import them into spreadsheets such as Microsoft Excel or Google Sheets for further analysis.

Export to PDF

You can also export your saved results as a PDF. This makes it easy to share or archive your results.

Clear all data

If you want to reset the data, use the CLEAR button to erase all the data at once.

Why the cube root matters

The cube root is an important mathematical operation used in many fields such as geometry, physics and engineering. It is needed to calculate volumes, solve cubic equations, or determine dimensions in three-dimensional problems. Understanding the cube root helps you analyze spatial data better and make calculations more precise.