Free OnlineCalculators & Converters
Square Root Calculator
Calculate the square root, cube root, or any nth root of a number instantly. Also computes squares, cubes, and shows nearby perfect squares.
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Key Features — Square Root Calculator
Square root of any number
Cube root calculation
Custom nth root (any n)
Shows squares and cubes
Nearby perfect squares table
Identifies perfect squares
Why Use This Tool — Square Root Calculator
Free Online Square root calculatorSqrt calculator — for EveryoneFast & Easy Cube root calculatorNth root calculator — 100% FreeFree Online Calculate square root
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Works Everywhere
Use on any device — desktop, tablet, or phone. No downloads or plugins needed.
Frequently Asked Questions — Square Root Calculator
What is the square root of a number?
The square root of a number n is the value x such that x × x = n. For example, √25 = 5 because 5 × 5 = 25. Every positive number has two square roots (positive and negative), but the principal square root is always positive.
What is a perfect square?
A perfect square is a whole number whose square root is also a whole number. Examples: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100. The calculator identifies perfect squares and shows the exact root.
Can you take the square root of a negative number?
Not in real numbers — the square root of a negative number is an imaginary number (e.g., √-4 = 2i). The calculator will indicate this. Cube roots of negative numbers are real (e.g., ∛-8 = -2).