1. Obtain the square footage of the room you are considering. 2. Go to the following URL address: http://www.eventageous.com/planning_guides/peoplecalc.htm. 3. Type the square footage
http://www.ehow.com/how_5173192_calculateroomcap...

to calculate a room's capacity is very simple. this is basically trying to find the 'volume' of the room. just multiply the height, the width, and the length together :
http://wiki.answers.com/Q/How_do_you_calculate_a_r...

1. Know the formula. Heat Capacity of a certain mass of an object can be calculated by dividing the amount of heat supplied to it by the corresponding rise in temperature. The unit
http://www.wikihow.com/CalculateHeatCapacity

You need to expand your question. How big is the room? Capacity for what? People? Food? Or do you mean how long will it take to chill the room based on its volume?
http://answers.yahoo.com/question/index?qid=200911...
