Square Root Calculator
Calculate the square root of any non-negative number.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter a non-negative number to calculate its square root.
Your result
4
Square root
AI explanation
Formula
Square root = value^(1/2)Worked example
Square root of 16
| Field | Value |
|---|---|
| Number | 16 |
| Square root | 4 |
Assumptions
- The square root of a negative number is not a real number, so this calculator requires a non-negative input. For a general root of any degree (including negative numbers with odd roots), use the Nth Root Calculator.
Frequently asked questions
How is a square root calculated?
The square root of a number x is the value that, when multiplied by itself, equals x — for example, the square root of 16 is 4 because 4 × 4 = 16.
Can a square root be negative?
Every positive number technically has two square roots (positive and negative) — this calculator returns the principal (positive) square root, which is the conventional default.
What about the square root of a negative number?
That requires imaginary numbers (i = √−1) and isn't a real number, so this calculator only accepts non-negative input.