his is a very simple script that calculates the amount of carbon emissions of any appliance given its wattage and time of use, it can easily be converted to a cost calculator by modifying the HTML in the form layout, there is no need to modify the javaScript. I have tried to annotate the script to help out where I can. If you choose to use it on your website I ask only the following: 1: A credit would be nice, a link back would be wonderful.