Occupant Load & Egress Capacity Calculator

Occupant load is the maximum number of persons expected to occupy a building space at any one time, calculated as Floor Area divided by the Occupant Load Factor in IBC Table 1004.5.

Per IBC § 1005.3.1 and § 1005.3.2, required egress width = Occupant Load × 0.2 inches for level components/doors and Occupant Load × 0.3 inches for stairways.

For occupant loads of 1 to 500, a minimum of 2 exits is required. Spaces with 501 to 1,000 occupants require at least 3 exits; more than 1,000 occupants require at least 4 exits.

The load factor represents square feet per person assigned to specific function types (e.g. 60 gross sq ft/person for Mercantile, 100 gross sq ft/person for Business offices, 15 net sq ft/person for Assembly tables).

Saudi Building Code SBC 801 governs Fire Protection & Life Safety Systems, aligning occupant load factors and egress width multipliers with international standards.

Yes. Even if a small room calculates an egress width of 10 inches, code minimums govern (e.g. 32 inches clear for doors, 44 inches clear for stairways serving 50 or more occupants).

In buildings equipped with an NFPA 13 automatic sprinkler system and emergency voice/alarm communication, egress width factors reduce to 0.15 inches for level components and 0.2 inches for stairs.

Gross area includes all space within exterior walls. Net area excludes corridors, stairwells, restrooms, and structural columns.

Occupant load factor is the designated floor area per person (in sq ft or m²) assigned to specific building functions to calculate total occupant capacity.

IBC Table 1004.5 assigns 7 net square feet per person for assembly areas with concentrated chairs (unfixed seats).

IBC Table 1004.5 assigns 150 gross square feet per person for standard business and office occupancy.

Gross area includes entire building footprint within exterior walls. Net area subtracts corridors, stairwells, closets, restrooms, and fixed equipment.

IBC Section 1006.2.1 requires at least two independent exits when occupant load exceeds 49 persons in Assembly/Business or 29 persons in Storage.

IBC Section 1005.3 specifies minimum width = Occupant Load × 0.2 inches per person for doors (or 0.15 inches per person in sprinklered buildings).

IBC Table 1004.5 assigns 30 gross square feet per person for ground-floor retail and 60 gross sq ft per person for upper retail floors.

For fixed seats, count actual seat units. For booth or bench seating, assign 1 person for every 18 linear inches (457 mm) of seating length.

International Plumbing Code (IPC Table 403.1) uses total calculated occupant load divided equally by sex (50/50) to determine required toilets and sinks.

IBC Table 1004.5 assigns 500 gross square feet per person for industrial manufacturing and 500 gross sq ft per person for storage warehouses.