How to use the cube root calculator
The cube root calculator finds the cube root of any number—the value that, when multiplied by itself three times, gives the original number. For example, the cube root of 8 is 2 because 2 × 2 × 2 = 8, and the cube root of 27 is 3. Unlike the square root, the cube root is defined for all real numbers: positive, negative, and zero. The cube root of −8 is −2, since (−2)³ = −8. Enter any number in the input field and click "Get result" to see its cube root with up to 10 decimal places.
Cube roots appear in geometry, physics, and engineering whenever quantities depend on volume or scale with the third power. The volume of a cube with side length s is s³, so finding the side length from a given volume means taking the cube root. In algebra, cube roots are used to solve equations of the form x³ = k. Perfect cubes such as 1, 8, 27, 64, 125, and 216 have whole number cube roots; other numbers have irrational cube roots that this calculator approximates to high precision.
To use the tool, type a number (integer or decimal, positive or negative) and press Enter or click the button. The result is shown in the form ∛x = value. You can verify common cases: ∛1 = 1, ∛8 = 2, ∛27 = 3, ∛64 = 4, ∛125 = 5, and for negatives ∛−8 = −2, ∛−27 = −3. The calculator uses JavaScript's Math.cbrt function for accuracy and works on all devices, including phones and tablets.
This page is designed to be mobile-friendly and responsive. The layout stacks neatly on small screens, and the explanation below helps you understand cube roots and when to use them. Whether you are checking homework, solving a real-world problem, or exploring how cube roots behave for different inputs, this cube root calculator gives you fast, clear results with dedicated SEO content to support learning and reference.