looking for formula to figure number of person per room or where I can find it.
Which code NFPA 101 or IFC or other??
Are you just asking for one particular room or many?
What are the rooms used for?
Check table 1004.1.2::
NFPA 101 Table 18.104.22.168
The answer depends on what the information will be used for. NFPA 101 Table 22.214.171.124 gives you occupancy rates to size/confirm exiting capacity. Table 6.1 in ASHRAE 62.1 is used to calculate minimum ventilation rates and cooling loads for a space. As a simplified method, the furniture layout can be used to determine the number of occupants.
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