Free Square Root Calculator — nth Root & Powers Online
Calculate square roots, cube roots, nth roots, squares, and cubes instantly for any number — all in your browser.
√ Square Root
—
∛ Cube Root
—
nth Root
—
n² Square
—
n³ Cube
—
How it works
Enter a number
Type any positive or negative number into the input field.
Set nth root (optional)
Change the root degree for cube roots (3) or any other nth root.
Read results instantly
Square root, cube root, nth root, square, and cube all update live.
Copy your result
Click any result to copy it, or just read it off the screen.
Common use cases
Geometry problems
Calculate side lengths, hypotenuse values, and areas using square root formulae.
Physics calculations
Find RMS values, standard deviations, and other root-based physics quantities.
Financial maths
Calculate compound interest roots like CAGR using nth root functionality.
Homework & exams
Verify manual root calculations instantly to check your working.
Frequently asked questions
What is the square root of a negative number?
Square roots of negative numbers are imaginary (complex numbers). This calculator shows "Not real" for negative inputs under even roots.
What is the difference between √ and ∛?
√ (square root) finds a number that when squared gives the input. ∛ (cube root) finds a number that when cubed gives the input.
How do I calculate the 4th root?
Set the nth root input to 4. The calculator will compute x^(1/4).
Can I calculate cube roots of negative numbers?
Yes — odd roots of negative numbers are real. For example, the cube root of -8 is -2.
Is this free to use?
Yes, completely free with no account required.
Are my calculations private?
Yes — everything runs in your browser. Nothing is sent to any server.