Free & Instant
Square Root Calculator
Find the square root of any number instantly, including non-perfect squares.
Square Root Calculator
Calculate square roots instantly.
Square Root
0What is a Square Root?
The square root of a number is a value that, when multiplied by itself, gives the original number. For example, the square root of 16 is 4, since 4 × 4 = 16.
Square Root Formula
√x = y, where y × y = x
Example: √25 = 5, since 5 × 5 = 25
Frequently Asked Questions
Can you take the square root of a negative number?
+
Not within real numbers — the square root of a negative number is an imaginary number, which this calculator doesn't compute.
What's a "perfect square"?
+
A perfect square is a number whose square root is a whole number, like 4, 9, 16, or 25. Non-perfect squares have irrational square roots.
Where are square roots commonly used?
+
Square roots are used in geometry (finding side lengths), physics (calculating distances and forces), and statistics (standard deviation calculations).