this is great...
http://www.hughchou.org/calc/coffee.cgi Stop Buying Expensive Coffee and Save Calculator
A new calculator suggested by Erika Lim from Caffeine Central (Seattle, WA). I, too, have been amazed by folks who bring in coffee from a Starbucks or convenience store every single day instead of just contributing to the local "coffee pot fund". I know office coffee may not stack up to the store bought versions, but is it really worth the long term costs? Many folks drink the equivalent of a wide screen TV every year!
Now to find a gasoline expense calculator!