Square Root Calculator
Find the square root of any number instantly. This free calculator also tells you whether the number is a perfect square, and handles negative inputs (imaginary result).
How to Use This Calculator
- Enter any number (whole or decimal).
- Click Calculate.
- See the square root and whether it’s a perfect square.
√n is the value x such that x² = n.
Example: √144 = 12 because 12 × 12 = 144.
Worked Example
√144 = 12 — a perfect square. √2 ≈ 1.414214 — irrational, so the calculator shows 6 decimal places.
Our Testing Process
Every DaProfitClub tool is tested before publishing. We verify roots against known perfect squares and reference calculators, test edge cases (0, negatives, decimals), and confirm the tool works on desktop and mobile browsers.
Frequently Asked Questions
What is a perfect square?
A number whose square root is a whole number, e.g., 1, 4, 9, 16, 25, 144. The calculator flags these automatically.
What is the square root of a negative number?
It’s imaginary, written with “i”. √(−9) = 3i. The calculator shows this form for negative inputs.
How many decimals are shown?
Up to 6 decimal places, with trailing zeros removed for clean results.
What is √0?
Zero — the calculator handles it correctly (√0 = 0).
Related Calculators
- Scientific Notation Converter — convert to scientific notation.
- Percentage Calculator — quick percent math.
- Word Counter — count words and characters.
- Random Number Generator — pick random integers.
Last updated: September 30, 2026