JavaScript Decimal to Hexadecimal

One of the skills every JavaScript developer should possess is the ability to convert decimal to hexadecimal JavaScript.

In this article, you are going to learn the conversion process, guiding you step by step.

Either you are a seasoned developer looking to enhance your skills or a newcomer eager to learn, this article is for you.

Explanation of Decimal to Hexadecimal JavaScript

In programming, numbers come in different forms. Decimal and hexadecimal are two simple numeric systems, each with its different advantages.

Converting decimal numbers to hexadecimal is essential for tasks such as color manipulation, memory management, and cryptography.

Read also: Longest-substring-without-repeating-characters JavaScript

Here’s how you can effortlessly perform this conversion in JavaScript:

The Fundamentals of Decimal and Hexadecimal Systems

Before we proceed into the conversion process, let’s understand the basics. Decimal is a base-10 numbering system, while hexadecimal is a base-16 system.

In the decimal system, digits range from 0 to 9, while hexadecimal uses digits 0 to 9 and letters A to F to represent values.

Using JavaScript’s Built-in Functions

JavaScript provides built-in functions to assist in number conversion. The Number.toString() method, when used with the argument 16, converts decimal numbers to hexadecimal.

For Example:

const decimalNumberValue = 125;
const hexadecimalNumber = decimalNumberValue.toString(16);



Converting Manually with Loops

For a deeper understanding, let’s explore a manual conversion using loops. We will divide the decimal number by 16 iteratively and extract remainder to form the hexadecimal equivalent.

Here’s an example code:

function decimalToHexadecimal(decimal) {
  let resultValue = '';
  while (decimal > 0) {
    const remainderValue = decimal % 16;
    resultValue = (remainderValue < 10 ? remainderValue : String.fromCharCode(87 + remainderValue)) + result;
    decimal = Math.floor(decimal / 16);
  return resultValue || '0';

Also read: Kahoot Hack JavaScript with Method and Example Codes

Dealing with Fractional Parts

What about decimal numbers with fractional parts? The parseInt() function enables us to extract the integer part of the decimal number and then apply the conversion methods mentioned earlier.

const decimalFractionValue = 123.625;
const integerPartValue = parseInt(decimalFractionValue);
const hexadecimalInteger = integerPartValue.toString(16);



Adding a Dash of ES6 Magic

ES6 proposed template literals, making hexadecimal conversion even more elegant.

const decimalValue = 83;
const hexadecimalValue = `${decimalValue.toString(16)}`;



Frequently Asked Questions

How can I convert a hexadecimal number back to decimal in JavaScript?

Converting hexadecimal to decimal is equally important. use the parseInt() function with the argument 16.

Can I convert negative decimal numbers to hexadecimal?

Precisely! Remember to handle the sign appropriately and perform the conversion on the absolute value.

Can I use hexadecimal notation in my JavaScript code?

Absolutely! Modern JavaScript supports hexadecimal notation for representing numbers. Simply prefix the number with 0x.

Is manual conversion more efficient than using built-in functions?

While manual conversion provides a deeper understanding, built-in functions are optimized for performance and convenience.

Are there online tools for instant decimal-hexadecimal conversion?

Yes, different online converters can swiftly perform decimal-hexadecimal conversions for you.


In conclusion, mastering the art of converting decimal numbers to hexadecimal is an important skill for any JavaScript developer.

It opens up possibilities in terms of color manipulation, memory management, and cryptography.

Whether you select built-in functions or manual methods, understanding the process equips you with valuable insights into how computers represent and process data.

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