Occupant Load Calculator

Occupant load -- the maximum number of people a space is designed to safely hold -- is the foundation figure that building and fire codes use to size exits, egress width, plumbing fixtures, and other life-safety features. This calculator estimates it the way the International Building Code's Table 1004.5 approach works: it multiplies Gross Floor Area by Accessible Area (%) to get the usable floor area, then divides by a floor-area-per-occupant factor that varies by Use/ Occupancy Type -- an assembly space used as standing room is the densest of all, allowing as little as 5 sq ft per person, with assembly space set up with chairs only (no tables) close behind at 7 sq ft, while a warehouse allows around 300 sq ft per person, reflecting how differently people are typically spaced in each occupancy type. IMPORTANT: the exact factors shown here are illustrative figures inspired by a commonly referenced version of IBC Table 1004.5 -- the real table's values, and the code edition and local amendments a specific jurisdiction has adopted, can differ, so always verify against the actual code edition and any local amendments in force for a real project, not this calculator alone. Minimum Exits Required follows a similarly simplified rule of thumb (2 exits up to 500 occupants, 3 up to 1,000, 4 above that) that broadly tracks real code tables but omits nuances like sprinkler status and travel distance that can also affect exit requirements.

Plumbing Fixtures Needed applies a single flat male/female fixture ratio regardless of Use/Occupancy Type, while the real IBC Plumbing Code table varies fixture ratios significantly by occupancy classification -- so treat this figure as a rough planning estimate, not a code-compliant fixture count. Est. Parking Spaces isn't derived from the IBC at all; parking minimums come from local zoning ordinances, which vary enormously by municipality, so this figure is a generic illustrative estimate only. For any real permit or life-safety determination, consult a licensed architect or fire protection engineer working from your jurisdiction's actual adopted code.