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Square Root Calculator

Enter a number to get its square root, cube root, an optional nth root, and its square, plus whether it is a perfect square.

The nth root is optional. Use 2 for the square root, 3 for the cube root, and any whole number of 2 or more for higher roots. Everything runs in your browser. Nothing is uploaded.

Decimal places

Results

Square root√x
12
Cube root∛x
5.241483
5th root⁵√x
2.70192
Squarex²
20,736
144 is a perfect square (12 × 12).

Everything is calculated in your browser. Nothing is uploaded.

How to calculate a square root online

  1. Enter a number

    Type any number, positive, negative, or zero, into the input field.

  2. Choose a root degree

    Set the nth root degree to also get the fourth root, fifth root, or any other root of the same number.

  3. Read the results

    The square root, cube root, chosen nth root, and the square are computed instantly as stat cards.

  4. Copy the results

    Use the copy button to place a plain summary of every value on your clipboard.

Why use this tool

Four results at once

Every entry returns its square root, cube root, your chosen nth root, and its square side by side.

Any root degree

Set the nth root to 4, 5, 10, or any degree of 2 or more to find higher roots of the same number.

Perfect square check

The calculator tells you whether the number is a perfect square, and flags perfect cubes too, with the exact whole-number factor.

Handles negatives and zero

Negative numbers show an imaginary square root while keeping real odd roots like the cube root, and zero is handled cleanly.

Adjustable precision

Switch between 2, 4, 6, and 8 decimal places to keep irrational roots as short or as exact as you need.

Runs entirely in your browser

Every calculation happens on your device. Nothing you type is uploaded.

About this tool

The square root of a number is the value that, multiplied by itself, gives that number back, and it turns up everywhere from geometry to statistics. This calculator finds it the moment you type. Enter any number and it returns the square root, the cube root, an nth root of your choosing, and the number squared, all at once as clearly labelled stat cards.

It handles the awkward cases properly. A negative number has no real square root, so the result is shown as an imaginary value while the cube root and other odd roots stay real, exactly as the mathematics requires. Zero returns zero for every root. The calculator also checks whether your number is a perfect square, showing the whole-number factor when it is, and flags perfect cubes in the same way. Square roots come up when solving right triangles, so it pairs well with the triangle calculator.

You can set the nth root to any degree of 2 or more to reach the fourth root, fifth root, tenth root, and beyond, and choose how many decimal places to show since most roots are irrational and never terminate. Everything updates instantly with no button to press, and empty or non-numeric input is caught with a short message instead of a broken result. For powers, trigonometry, and other operations beyond roots, try the scientific calculator.

Frequently asked questions

How do I find the square root of a number?
Type the number into the field and the square root appears instantly on the first stat card, along with the cube root, your chosen nth root, and the number squared. There is no button to press.
What is the square root of a negative number?
Negative numbers have no real square root, so the result is shown as an imaginary value written with the letter i. Odd roots such as the cube root remain real, so the cube root of a negative number is a normal negative number.
How do I calculate a fourth root, fifth root, or higher?
Set the nth root degree to the root you want, such as 4, 5, or 10, and that root is added to the results. You can use any whole number of 2 or more.
How do I know if a number is a perfect square?
The calculator checks automatically. If the number is a perfect square it says so and shows the whole number that squares to it, for example 12 for 144. Perfect cubes are flagged the same way.
Why do the roots have so many decimals?
Most square roots and higher roots are irrational, so their decimals never end or repeat. The values are rounded to the number of decimal places you choose, which you can set to 2, 4, 6, or 8.
Is my data uploaded anywhere?
No. Everything runs in your browser; nothing is sent to a server.

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