Power Calculators

ⁿ√ Nth Root Calculator

Calculate the principal real nth root of a positive number.

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Enter details

Fill in the details and click Calculate to see your results.


Also available in our Android app, with charts and full breakdown tables.

📘 About the Nth Root

Use for square, cube and higher roots.

🧮 Formula

Where

  • x = radicand
  • n = index
Use positive number and positive index.

✏️ Worked example

Fourth root of 256

You enter
Number256
Root Index4
You get
Nth Root4
Valid Input1

The answer is 4.

Try this example →

🧭 How to use this calculator

What you enter

  • Number
  • Root Index

What you get

  • Nth Root
  • Valid Input

💡 Common uses

  • School mathematics and algebra
  • Scientific calculations
  • Engineering and measurement

❓ Frequently asked questions

What does the index mean?

It tells which power of the result gives the original number.