Square Root Calculator
Find the square root of a number.
Worth Knowing
The square root reverses squaring, and every positive number has two of them — a positive and a negative — though this tool reports the principal (positive) root. Negative numbers have no real square root, which is where imaginary numbers enter mathematics. Most square roots are irrational, meaning their decimals never terminate or repeat, so any displayed value is a rounded approximation of a number like √2 = 1.41421356… that continues forever.
How to Use
- Enter Number into the Square Root Calculator above.
- Your result appears instantly as you type — there's no submit button or page reload.