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Wednesday, February 1, 2023

Convert Fahrenheit to Celsius with JavaScript


The United States is one of the last bodies that refuses to implement the Celsius temperature standard. Why? Because we’re arrogant and feel like we don’t need to change. With that said, if you code for users outside the US, it’s important to provide localized weather data to users. Let’s took at how you can convert between Fahrenheit and Celsius.

Fahrenheit to Celsius

The formula to convert Fahrenheit to Celsius is:

°C = 5/9 x (°F - 32)

The following function converts Fahrenheit to Celsius:

function convertFahrenheitToCelsius(degrees) {
  return Math.floor(5 / 9 * (degrees - 32));
}

Celsius to Fahrenheit

The formula to convert Celsius to Fahrenheit is:

°F = (°C × 9/5) + 32

The following function converts Celsius to Fahrenheit:

function convertCelsiusToFahrenheit(degrees) {
  return Math.floor(degrees * (9/5) + 32);
}

Temperature conversion is one of those things that’s difficult to do in your head due to the somewhat complex formula. If you have a site that reflects weather data, keep these handy functions nearby!

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