Calculadora de Raiz Cúbica
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
r = ∛n
About this calculator
The Cube Root Calculator is an online tool that computes the cube root of any real number. Unlike the square root, the cube root of a negative number is also real, because a negative number raised to the cube yields a negative result. The formula is r = ∛n, where n is the input number and r is the result. For example, the cube root of 8 is 2, since 2³ = 8; the cube root of -27 is -3, since (-3)³ = -27.
This calculator is useful in various everyday situations, such as geometry problems (finding the side of a cube from its volume), physics (density or force calculations), engineering (structural dimensioning), and even financial mathematics (growth models). Simply enter the desired number and the result is displayed instantly, without the need for manual calculations.
When using the calculator, remember that the cube root of zero is zero. For positive numbers, the result is positive; for negative numbers, it is negative. The tool handles decimal and integer numbers, providing precision up to 10 decimal places. Always double-check that the number was entered correctly, especially when using comma or decimal point.
Frequently asked questions
What is the difference between cube root and square root?
The square root only exists for non-negative numbers, while the cube root exists for all real numbers. Also, the square root of a positive number has two values (positive and negative), but the cube root has only one real value.
How to calculate the cube root of a negative number?
Simply enter the negative number in the calculator. The result will be negative, because a negative number raised to the cube is also negative. Example: cube root of -8 is -2.
Can I calculate the cube root of decimal numbers?
Yes, the calculator accepts decimal numbers. Use the dot (.) as decimal separator. For example, to calculate the cube root of 15.625, enter 15.625 and the result will be 2.5.
How many decimal places does the calculator show?
The calculator displays the result with up to 10 decimal places, depending on the required precision. If the number is a perfect cube, the result will be exact.
What is a perfect cube?
A perfect cube is a number that can be expressed as the cube of an integer. Examples: 8 (2³), 27 (3³), 64 (4³). The cube root of a perfect cube is always an integer.