√ Square Root & Powers Calculator

Calculate square roots, cube roots, squares, cubes and any power instantly.

Number Operation

Enter a number

Common square roots

Number	Square root	Squared
1	1	1
2	1.4142	4
3	1.7321	9
4	2	16
9	3	81
16	4	256
25	5	625
100	10	10,000

Frequently asked questions

What is the square root of 2?

The square root of 2 is approximately 1.41421356. It is an irrational number — its decimal digits go on forever without repeating. It is the length of the diagonal of a unit square.

Can you take the square root of a negative number?

Not in the real number system. The square root of a negative number is an imaginary number (using the imaginary unit i, where i² = −1). This is part of complex number mathematics.

What is the difference between x² and √x?

x² (x squared) multiplies x by itself. √x (square root of x) finds the number that when squared gives x. They are inverse operations: √(x²) = x and (√x)² = x for positive x.