JavaScript Celsius to Fahrenheit and Back Conversion Functions

December 2025

These are the JavaScript functions I use to convert back and forth between Celsius to Fahrenheit:

JavaScript

function c2f(c) {
  return (c * 9/5) + 32;
}

JavaScript

function f2c(f) {
  return (f - 32) * 5/9;
}

You can see the output in the console.

JavaScript

console.log(c2f(30));

console.log(f2c(32));

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