How do you calculate a room's standing capacity?

Answer 1

A simple measurement of area(length X width) is all that is needed. This gives you the sq footage of the room. You would want to subtract any tables, chairs, or other areas people will not be able to stand in from the square footage. Once that is done divide by 36 (36sqft is a commonly used number for amount of space someone will need in a room...it is much larger than necessary, but gives room for people to walk around and get to the bathrooms, bar, etc). That will give you a pretty good measure of standing capacity.