Author -  Sai gowtham

# Converting (binary,hex,octal) to decimal numbers in JavaScript

In this tutorial, we are going to learn about how to convert binary, hexadecimal and octal to decimal numbers in JavaScript.

## parseInt

In JavaScript, we have the `parseInt()` method by using that we can make conversions.

The parseInt( ) method takes the two arguments, the first argument is `string` and the second argument is `base` by using that it returns the decimal number of a specified base.

Let’s see the conversions with the help of examples.

## Converting binary to decimal

To convert a binary to decimal we need to pass base `2` as a second argument to the `parseInt` method.

``````
const binaryNumber = "1100";

console.log(parseInt(binaryNumber,2)); // base 2

//output--> 12``````

To convert a hexadecimal to decimal we need to pass base `16` as a second argument to the `parseInt` method.

``````
const hex = "c";

console.log(parseInt(hex,16));  //hex base-16

//output --> 12``````

## Converting octal to decimal

To convert a octal to decimal we need to pass base `8` as a second argument to the `parseInt` method.

``````const octal = "14";

console.log(parseInt(octal,8));  //octal base-8

//output --> 12``````

You can also learn, how to convert decimal to (binary, hexadecimal, octal) numbers in JavaScript.

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