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Square Root Calculator

Calculate the square root of any positive number. Enter a number to get its square root instantly.

Enter a positive number:
About Square Roots

The square root of a number is a value that, when multiplied by itself, gives the original number.

For example, the square root of 25 is 5 because 5 × 5 = 25.

Key points:

• Square roots of negative numbers are not real numbers

• The square root of 0 is 0

• For most numbers, square roots are irrational numbers with infinite decimal places

• This calculator provides results to 8 decimal places for precision

How to use Square Root Calculator

  1. 1

    Enter a number

    Type a positive number, such as 25 or 144.5, into the input field.

  2. 2

    Set decimal places

    Choose how many decimal places you want, up to 8, to control the precision of the result.

  3. 3

    Calculate the root

    Click Calculate Square Root to compute the value instantly in your browser.

  4. 4

    Copy the answer

    Use the Copy Result button to save the square root to your clipboard for use elsewhere.

Frequently asked questions

How precise are the square root results?
You can set the output to as many as 8 decimal places. The calculator rounds the result to your chosen precision, which is accurate enough for math homework, engineering estimates, and most everyday calculations.
Can it find the square root of a negative number?
No. Negative numbers have no real square root, so the tool only accepts positive values and zero, and it will show an error message if you enter a negative number.
Does it work for decimals and very large numbers?
Yes. You can enter decimal values like 2.5 or large numbers, and the calculator returns the square root using your browser's native math precision.
Why is the square root of a number like 2 not exact?
Many square roots are irrational numbers with infinite non-repeating decimals, so the tool shows a rounded approximation limited to your selected number of decimal places rather than a never-ending value.
Is the calculator free and private?
Yes. It is completely free with no sign-up, and every calculation runs locally in your browser, so the numbers you enter are never uploaded to a server.

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