How to Convert Percentage to a Decimal in JavaScript

In this tutorial, we are going to learn about how to convert the percentage to a decimal value in JavaScript with the help of examples.

Consider, we have a following percentage:

a = "40%";

Now, we need to convert the above percentage to a decimal value like this: “40%” to 0.4 .

To convert the percentage to a decimal value in JavaScript, first we need to pass the percentage string to a parseFloat() function then divide the result with the 100.

The parseFloat() function takes the string as an argument and parses it to a float point number.

Here is an example:

a = "40%"
decimal = parseFloat(a)/100;

console.log(decimal);

Output:

0.4

In the example above, first we passed the percentage string to a parseFloat() function and divided the result with 100. So, it returns the decimal value.

We can also create our own reusable function to convert the percentage to a decimal like this in JavaScript.

function percentToDecimal(percent){
    return parseFloat(percent)/100 ;
}

Usage:

console.log(percentToDecimal(50%)); // 0.5

console.log(percentToDecimal(70%)); // 0.7