NOTE: This page calculator is no longer active because the free tier AWS machine I was hosting on turned out to be not very free. So here's to boycotting AWS (and sadly forgoing it's EC2 PHP-abilities) and their purposefully confusing billing system and general trickery.
Ever stay at an airbnb in New Braunfels, TX with 14 of your friends in early August - and that airbnb had a Cowboy Pool that you were excited to cool off in - but that Cowboy Pool was like 85 degrees - so you wanted to figure out how many bags of ice you'd need to add to the pool in order to cool it off - so you did some drunken math on a coffee filter but wished you had a custom calculator to make the process faster?