How to use the square root calculator
The square root calculator finds the square root of any non-negative number—the value that, when multiplied by itself, equals the original number. For example, the square root of 16 is 4 because 4 × 4 = 16, and the square root of 25 is 5. Enter a positive number or zero in the input field and click "Get result" to see √x with up to 10 decimal places. Negative inputs are not accepted because the square root of a negative number is not a real number; it would require complex numbers (imaginary unit i).
Square roots are used throughout mathematics, science, and engineering. They appear in the Pythagorean theorem (distance and diagonal length), in standard deviation and variance formulas, in quadratic equations, and in many physics and geometry problems. Perfect squares such as 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100 have whole number square roots; other positive numbers have irrational square roots that this calculator approximates to high precision using JavaScript's Math.sqrt.
To use the tool, type a number (integer or decimal, ≥ 0) and press Enter or click the button. The result is shown as √x = value. You can check common cases: √4 = 2, √9 = 3, √16 = 4, √25 = 5, √36 = 6, √49 = 7, √64 = 8, √81 = 9, √100 = 10. For decimals, √0.25 = 0.5 and √2.25 = 1.5. The layout is responsive and works on phones and tablets as well as desktops.
This page is designed to be mobile-friendly with a clear two-column layout that stacks on small screens. The explanation below helps you understand what the square root is and when to use it. Whether you are solving homework, checking a formula, or exploring how square roots behave, this square root calculator gives you fast, accurate results with dedicated SEO content for learning and reference.