Nth Root Calculator
An nth root asks which number, multiplied by itself n times, gives your number. A square root is the 2nd root, and a cube root is the 3rd. Enter a number and the root you want.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
To find the nth root, raise the number to the power of one divided by n.
To check the answer, raise the root to the power n. You should get back the number you started with, up to rounding.
Worked example
For 125, the root with index 3 is 5. Raising 5 to the power 3 gives 125.
Questions
What is the 2nd root?
That is the square root. The 3rd root is the cube root.
Can the number be negative?
This calculator takes zero or positive numbers only. Negative numbers need special rules for even roots, so they are left out.
Why is the check slightly off?
Computers round decimals, so the check can differ in the last digits. That is normal.
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- Standard Deviation CalculatorSpread of a list of numbers.
- Weighted Average CalculatorAverage where some values count more.