How to Calculate Occupant Load Using IBC Standards

Occupant Load Calculator

This calculator is based on the 2018 International Building Code (IBC).

Function of Space Assembly – Standing Space Assembly – Chairs Only Assembly – Tables & Chairs Assembly – Exercise Rooms / Gym Business Areas / Offices Classrooms Laboratories Training Rooms Retail Sales Floor Retail Storage / Stock Library / Museum / Exhibit Factory / Industrial Areas Warehouse / Storage Residential – Sleeping Areas Residential – Living Areas Patient Rooms (Inpatient) Clinics / Day Rooms Detention Cells / Housing Prison / Detention Facilities Restaurant / Cafeteria Nightclubs / Bars / Theaters

Square Footage

Load Factor

Net / Gross

Occupant Load

-

Disclaimer:
This calculator is intended for educational purposes only and does not represent an official occupant load determination. Users must consult their local Authority Having Jurisdiction (AHJ). Calculations are based on the 2018 International Building Code (IBC).

Occupant Load

Occupant load is the maximum number of people that a building or specific space is designed to safely accommodate. It is based on the capacity of exits and egress components. The calculation is a key part of fire and life safety planning. 

Importance of Occupant Load Calculation

Helps ensure safe evacuation during emergencies Supports compliance with building and fire codes Determines the required number and width of exits Used to calculate plumbing fixture quantities Assists in designing fire alarm and fire protection systems Required for permits, approvals, and inspections Methods of Calculation Spaces without fixed seating: Occupant Load = Floor Area ÷ Occupant Load Factor Spaces with fixed seating: Occupant load equals the total number of fixed seats, plus any standing areas calculated separately using standard load factors 

Disclaimer 

This calculator provides estimated occupant loads based on commonly adopted IBC criteria. Final occupant load values must be verified and approved by the local authority having jurisdiction (AHJ), such as the building department or fire marshal.