How to convert Celsius to Farenheit in JavaScript

In this tutorial we will do some conversion. We will first convert Celsius to Farenheit, and then Farenheit to Celsius. I got the idea to do this guide when I developed our simple weather widget where I did some conversion work.

Formulas

We start with the formula of converting Celsius to Farenheit. It goes like this.

F = (C × 1.8) + 32

And Farenheit to Celsius is like this:

C = (F - 32) / 1.8;

Not to complicated, right? Let's do some code!

Celsius to Farenheit

const celsiusToFarenheit = (c) => Math.round(c * 1.8 + 32);

We will use Math.round() to get a whole number instead of getting decimals. Now, let's test it.

console.log(celsiusToFarenheit(29)); // 84
console.log(celsiusToFarenheit(32)); // 90
console.log(celsiusToFarenheit(5)); // 41

Farenheit to Celsius

All right, let't do the opposite.

const farenheitToCelsius = (f) => Math.round((f - 32) / 1.8);

And let's test it with the results of our previous test to see if it gets back to its original value...

console.log(farenheitToCelsius(84)); // 29
console.log(farenheitToCelsius(90)); // 32
console.log(farenheitToCelsius(41)); // 5

We did it!!

Outro

In this short guide, we demonstrated how to convert temperatures from Celsius to Farenheit and then back again to celsius. I hope you got some value out of this guide, and good luck in your current project!

Have a great day!