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Did this get moved? I just tried to access it, and got a message that the file doesn't exist.I found this posted at Reddit (I think). I haven't looked too closely at it yet, but it is the first sheet I've found that calculates things for you.
https://docs.google.com/spreadsheets/d/1HR90_7m9dblgxBp8vtELujhxa78I44mCmKu ChIhNUjo/edit#gid=0
I made the sheet in question. Here you go.