Cube Root Calculator
Use our cube root calculator to calculate cube root values instantly. Includes what cube roots are, how to calculate cube root on calculator (cube root button on calculator tips), a cube root calculator step by step walkthrough, and methods for how to calculate cube root by hand and how to estimate cube roots.
What are Cube Roots?
A cube root is a number that, when multiplied by itself three times, gives the original number. If x^3 = a, then x is the cube root of a.
If you’re asking what are cube roots, they are the inverse operation of cubing a number. Cube roots are common in algebra, geometry (volume), and many real-world calculations.
This cube root calculator is designed to calculate cube root quickly and accurately for positive and negative numbers.
Cube Root Formula
The cube root of a number a is written as ∛a and can be expressed using exponents.
Cube root is the same as raising a to the power of 1/3.
Cubing a cube root returns the original number.
Because 3^3 = 27.
Because (-4)^3 = -64. Cube roots of negative numbers are real.
How to Use the Cube Root Calculator
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Enter the number a you want the cube root of.
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The calculator computes ∛a (cube root of a).
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Review the result and, if needed, verify by cubing it to see if you get back a.
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If you need a cube root calculator step by step approach, use the formula ∛a = a^(1/3) and follow exponent rules.
Frequently Asked Questions
Use ∛a = a^(1/3). A cube root calculator computes this automatically.
Find x such that x^3 = a. For perfect cubes, this is an integer; otherwise it’s usually a decimal.
Use the ∛ key if available. If not, use exponent mode: raise the number to the power 1/3 (often written as x^(1/3)).
Many scientific calculators show it as ∛x or x^(1/3). Some require a SHIFT/2nd key to access it.
Either press the ∛ key, or type the number then use the power function to raise it to (1/3).
Yes. If a is negative, ∛a is also negative (for real cube roots).
For perfect cubes, identify the number whose cube matches a (like 2^3=8, 3^3=27, 4^3=64). For non-perfect cubes, you can approximate using estimation or iterative methods.
Bracket the number between nearby perfect cubes. Example: 50 is between 27 (3^3) and 64 (4^3), so ∛50 is between 3 and 4.
Yes—this tool functions like a cube root scientific calculator and computes ∛a for any real input.
Use a calculator that supports fractional exponents or the ∛ function. Then verify by cubing the result.