JavaScript sqrt

The JavaScript sqrt function is a Math function used to find the square root of a specified expression or a specific number. The syntax of the sqrt Function is:

  • If the number argument is a positive integer, the JavaScript math sqrt will return the square root of a given value.
  • The Square root function will return NaN if it is negative or not a number.
  • And if it is Null, it returns Zero.

JavaScript sqrt Function Example

The sqrt function finds the square root of a given number. In this example, we will find the JavaScript square root of different data types and display the output.

<!DOCTYPE html>
    <title> JavaScriptSQRTFunction </title>
  <h1> JavaScriptSQRTFunction </h1>
  <p id = "Pos"></p>
  <p id = "Neg"></p>
  <p id = "Dec"></p>
  <p id = "Neg_Dec"></p>
  <p id = "Str"></p>
  <p id = "Null"></p>
    document.getElementById("Pos").innerHTML = Math.sqrt(10);
    document.getElementById("Neg").innerHTML = Math.sqrt(-10);
    document.getElementById("Dec").innerHTML = Math.sqrt(14.05);
    document.getElementById("Neg_Dec").innerHTML = Math.sqrt(-6.05);
    document.getElementById("Str").innerHTML = Math.sqrt("JavaScript");
    document.getElementById("Null").innerHTML = Math.sqrt(null);


  1. First two statements, We used the JavaScript SQRT Function directly on the Positive and negative integers. The screenshot below shows that it returns NaN as output for a negative integer.
  2. Following four statements, we used the JavaScript Function on the Positive and negative Decimal values. As we said before, it is returning NaN for negative decimal.
  3. Using this Function on the string value and also returns NaN
  4. Last, We tried the SQRT Math function on Null value, and it returns Zero as output.
JavaScript SQRT Function