This is a frequent question we get at the helpdesk.
Is there an online guide that will help me determine how much food to buy for any given size amount of people?
Does anyone have advice about quantities when cooking for crowds?
We've also have requests for large quantity recipes that feed a group such as the homeless.
I don't recall ever seeing an online guide per se but there's always that possibility with the web. I have seen workshops and books that address LARGE crowds (minimum 50 people) as food safety is a REAL big issue when dealing with the masses. Have you tried a general search to see what's out there?