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Square Root Calculator Guide
Find the square root, cube root, or any nth root of a number. The square root of a number is the value that, multiplied by itself, gives that number.
The square root of x is written √x and satisfies √x × √x = x. More generally, the nth root of x is the number that, raised to the power n, equals x.
How Do I Find a Square Root?
Look for the number that multiplies by itself to give your value. The square root of 144 is 12 because 12 × 12 = 144. For values that aren't perfect squares, the result is a decimal — the square root of 2 is about 1.41421.
Perfect Squares and Cube Roots
Perfect squares like 1, 4, 9, 16, and 25 have whole-number square roots. The cube root reverses cubing — the cube root of 27 is 3 because 3 × 3 × 3 = 27. Square roots of negative numbers are not real numbers.
Related: Exponent Calculator, Quadratic Formula, and Triangle Calculator.
Frequently Asked Questions
What is a square root?
The square root of a number is the value that, multiplied by itself, gives that number — for example, √144 = 12.
How do I calculate a cube root?
Find the number that, multiplied by itself three times, gives your value; the cube root of 27 is 3.
What is the nth root?
The nth root of x is the number that raised to the power n equals x, calculated here for any value of n.
Can you take the square root of a negative number?
Not within the real numbers — the square root of a negative value is imaginary, so this calculator flags it.
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