Calculations to work out Celsius and Fahrenheit using Kelvin or vice versa

Kelvin Weather Deep in his mountain-side meteorology lab, the mad scientist Kelvin has mastered weather prediction.

Recently, Kelvin began publishing his weather forecasts on his website. However there’s a problem: All of his forecasts describe the temperature in Kelvin.

With our knowledge of JavaScript, let’s convert Kelvin to Celsius, then to Fahrenheit.