How to Find the Square Root of a Number (and Cube Root)

Published 5 November 2026 by Kloora Tools

Quick answer: use the free Square Root Calculator to find the square root, cube root or any root of a number and check if it is a perfect square. It runs in your browser, so nothing you enter is uploaded or stored, and there is no signup.

What is the Square Root Calculator?

Find the square root, cube root or any root of a number and check if it is a perfect square. People often search for it as "square root calculator", "cube root calculator" or "nth root calculator". This free version works on any phone or computer and needs no download.

How to use the Square Root Calculator

Open the Square Root Calculator.
Enter your values in the fields.
The results update instantly as you type.
Note or copy the numbers you need.

How it works

The square root of n is the number that multiplied by itself gives n. A perfect square has a whole number root, such as 144 with a root of 12. The nth root of n is n raised to the power 1 / k, so the cube root uses 1 / 3. Real square roots of negative numbers do not exist, so the tool reports that case.

Worked example

Input: Number: 144; Root (2 = square, 3 = cube): 2
Result: Root 2: 12; Square root: 12; Cube root: 5.24148279; Perfect square?: Yes; Squared: 20,736

Common uses

Check homework and geometry problems
Find the side of a square from its area
Test whether a number is a perfect square

Second worked example

Here is the same tool with larger numbers, so you can see how the result scales.

Input: Number: 216; Root (2 = square, 3 = cube): 2
Result: Root 2: 14.69693846; Square root: 14.69693846; Cube root: 6; Perfect square?: No; Squared: 46,656

Tips for the best result

Check the units and the order of the numbers before you press anything.
Estimate the answer roughly in your head first, so you can spot an input mistake.
Keep more decimal places during the work and round only the final answer.
Try a simple case you already know to confirm the tool does what you expect.

Common mistakes to avoid

Swapping two inputs, such as base and exponent or x and y.
Using degrees where radians are expected, or the other way round.
Rounding too early and carrying the error forward.
Entering a percentage as a decimal, or a decimal as a percentage.

Square Root Calculator compared with doing it by hand

	Square Root Calculator	By hand or in a spreadsheet
Speed	Instant, results update as you type	Slow, you rebuild the steps each time
Accuracy	Same standard method every time	Easy to slip on a formula or a unit
Privacy	Runs in your browser, nothing uploaded	Depends on the software you use
Cost	Free, no signup	Free or paid software needed

Try it now

Open the Square Root Calculator and try your own numbers or text. If it helps, share it with someone who needs it.

Try it now: Square Root Calculator. Find the square root, cube root or any root of a number and check if it is a perfect square.

Frequently asked questions

What is a square root?

It is the number that multiplied by itself gives the original number. The square root of 49 is 7.

Can I take the root of a negative number?

Not as a real number. The square root of a negative number is imaginary, so the tool shows a message.

What does the Square Root Calculator do?

Find the square root, cube root or any root of a number and check if it is a perfect square.

How do I use the Square Root Calculator?

1. Enter your values in the fields. 2. The results update instantly as you type. 3. Note or copy the numbers you need.

Is my data safe when I use the Square Root Calculator?

Yes. Everything runs in your browser on your own device. Nothing you type or choose is uploaded, stored or shared, and no AI service is used.

Does the Square Root Calculator work on a phone?

Yes. It works on phones, tablets and computers in any modern browser, with nothing to install.

Do I need an account or a payment to use the Square Root Calculator?

No. It is free, has no daily limit, no watermark and needs no signup.

What information does the Square Root Calculator need?

You enter: Number, Root (2 = square, 3 = cube). The results update instantly as you change any value.

How does the Square Root Calculator work?

The square root of n is the number that multiplied by itself gives n.

Can I use this for "cube root calculator"?

Yes. The Square Root Calculator is built for exactly that, and it also answers searches such as "square root calculator" and "nth root calculator".

How accurate is the Square Root Calculator?

It uses the standard method and shows results to a sensible precision. For legal, medical, financial or safety decisions, confirm important numbers with a qualified professional.

Where can I find more free tools like the Square Root Calculator?

Kloora Tools has over 150 free tools for CVs, PDFs, images, Urdu, calculators and everyday tasks. Browse them all from the home page.