RootLab

Square Root Calculator

√n and n² together.

The inverse of squaring

√n asks 'what number, multiplied by itself, gives n?' — it undoes squaring, which is why negative numbers have no real square root: no real number squared can produce a negative result.

Where it's used

Square roots appear in the Pythagorean theorem, standard deviation, physics equations for speed and energy, and any time you're reversing an area calculation to find a side length.

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RootLab

Square Root Calculator

√n and n² together.

Number

Square root

√n

Squared: 20,736

What you entered

Number: 144

1
Take the square root
√144= 12
2
Check: square it back
12²= 144

Result

Square root: 12

The square root of 144 is 12.

The inverse of squaring

√n asks 'what number, multiplied by itself, gives n?' — it undoes squaring, which is why negative numbers have no real square root: no real number squared can produce a negative result.

Where it's used

Square roots appear in the Pythagorean theorem, standard deviation, physics equations for speed and energy, and any time you're reversing an area calculation to find a side length.