Square Root Calculator
Enter values to calculate square root with a clear result.
Calculate
Enter values and select Calculate.
How it works
Nth root of x is the number y such that y raised to the power n equals x. Even roots of negative numbers have no real answer.
Worked examples
- Square root of 81: 9
- Cube root of −27: −3
Frequently asked questions
Is this calculator free?
Yes. You can use it without paying or creating an account.
Does it work on a phone?
Yes. The page adapts to small and large screens.
Can I enter zero?
Where zero is mathematically valid, the calculator accepts it.
What happens if I enter an invalid value?
You will see a clear message explaining what to correct.
Does the calculation run in my browser?
Yes. The calculator runs with JavaScript on your device.
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Last updated: October 17, 2026