How to Find the Cubed Root of a Number

To cube a number, you must multiply it three times. For instance, 2 cubed would be the result of multiplying 2 2 2, which totals 8. On the other hand, the cubed root of a number works the opposite way. For example, if 2 cubed is 8, the cube root of 8 is 2 because when you multiply the number 2 three times, it equals 8. Perfect cubes are the cubes of whole numbers such as 8, 27 and 64 that have an cube root such that is also a whole number. Surds are numbers that don't have an exact cubed root, but certain sites can help you find the cubed root for surds swiftly.

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The Internet enables you to find the cube root of irrational numbers (surds).

Math Warehouse

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Go to the Math Warehouse website. Math Warehouse is a site that offers a free-to-use cube root calculator and solver that helps you find the cube root for any number whether it is a perfect cube number or an irrational number (surds).

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Enter the number you want to find the cube root for in the field displayed beside where it says "Enter Number."

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Click the "Calculate" tab displayed above where it says "Enter Number" and the cube root for your desired number will be displayed below where it reads "Reduced Cube Root."

Analyze Math

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Visit the Analyze Math site. This website features a cost-free cube root calculator service that will help you calculate the cube root of any number.

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Type the number you want to calculate the cube root for in the field located next to where it says "x =," beneath where it reads "How to use the calculator."

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Click "Enter" displayed below where you typed the number that you want to find the cube root for, and the cube root for that number will be displayed in the field placed next to where it says "cube root (x) =."

CSG Network

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Navigate to the CSG Network Web page. The free cube and cube root calculator available on the CSG Network website enables you to find the cube root and the cube of any given number.

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Enter the number you want to find the cube root for in the field located next to where it says "Enter A Value."

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Click "Calculate" and the cube root for the number you typed will be displayed in the field that reads "Calculated Cube Root," plus the cube for the same number will also be displayed next to where it says "Calculated Cube."