Square Root Calculator

While it’s easy to find the square root of a perfect square, it’s difficult to work out other square roots. The square root calculator helps you find out the square root of any numbers. Besides the square root calculation tool, this page also provides you with detailed information about square root calculation.

What is a square root?

The square root of a number x is a number y such that y2 = x. In other words, a number y whose the result of multiplying y by itself is x.

Square root symbol

The symbol os square root is √. It looks like a tick but is actually called radical. When we want to find the square root of 64, we can write in this way: √64.

Square root examples

Square root example 1: What’s the square root of 100?

The answer is 10, because of 10 * 10 = 100.

Square root example 2: What’s the square root of 81?

The answer is 9, because of 9 * 9 = 81

Can a square be a negative number?

We know that the square root of 64 is 8 because 8 * 8 is 64, but can’t the square root be a negative number? Because -8 * -8 = 64, too.

The answer is Yes. In this case, both -8 and 8 could be the square root of 64. However, when the radical symbol is used (i.e. √64) , the result must be a positive number (or zero).

Perfect squares

A Perfect Square (also called “Square Number”) is the square of an integer. The table below shows the perfect squares obtained by squaring 0 to 20.

Perfect Squares
0 0
1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81
10 100
11 121
12 144
13 169
14 196
15 225
16 256
17 289
18 324
19 361
20 400

How to use the square root calculator?

To use our square root calculation tool, walk through the steps below:

  1. Let’s say you want to find the square root of 144. Enter 144 in the first field
  2. Check the result. In this example, you will obtain “12”.

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