Talk:BarCamp - How to Run Your Own/Venues

The number of rooms needed is going to vary on the size of your camp.

If you are dealing with about 50 people, 4 rooms is plenty, if you are dealing with 100 people, 4 rooms might not be enough. I'd estimate that you need 1 room per 20 people or so, and I'd also add a common room for discussion and general hacking / resting as well. At any given point you'd have about 10% of the camp in the rest room, with people spread over the other rooms.