# How to Calculate Occupant Load

Blog Post created by vboutin on Apr 6, 2020

A fundamental concept of model building codes, fire codes, and life safety codes is that a means of egress is designed to accommodate all occupants of a building. Knowing how to determine the total occupant load of a building is an integral part in determining if the building meets that basic concept. It can be difficult to estimate how many people are going to use a space within a building so most model codes that address egress design will provide requirements for how to estimate this number.

• Select an occupant load factor
• Determine the size of the room
• Apply the occupant load factor to the space

There is a common misconception that the calculated occupant load is the maximum number of occupants the space can contain. Instead, the calculated occupant load is actually the minimum number of expected occupants. If the designer, building owner, or other involved party knows the expected number of occupants may be higher than the calculated number of occupants, then that number should be used as the occupant load. If, for example, the building owner knows there will be 5 people working in a storage room that has a calculated occupancy of 3 people, the design needs to be based off of the expected occupant load (5 people). Now, if the building owner says there will only be 1 person in the storage room that has a calculated occupancy of 3 people, the design needs to be based off of the calculated occupant load (3 people).