Find out the approximate size of banquet, conference hall or what size room you will need for your number of people attending using this simple online meeting space calculator. Just enter the number of people or exhibition booths and find the result of 60'' round tables, 72'' round tables, Theater Seating, 18'' desks, 30'' desks, Reception, 8'x10' booths and 10'x10' booths in sq.ft.