Egress Exit Count and Required Width (IBC 1005.3 / 1006.2)

The number of separate exits (1 up to 49, 2 to 500, 3 to 1,000, 4 beyond) and the clear width per exit (occupant load x a capacity factor of 0.15 in/occ level or 0.2 in/occ stair when sprinklered, 0.2 / 0.3 without), divided among the exits and floored at the 32 in door-leaf minimum. For a modest load the exit count and the leaf minimum control, not the raw width. A design aid, not a code-official determination.

factor = stair ? (sprinklered ? 0.2 : 0.3) : (sprinklered ? 0.15 : 0.2); exits_required = ol <= 49 ? 1 : ol <= 500 ? 2 : ol <= 1000 ? 3 : 4; total_width_in = ol x factor; per_exit_in = max(total_width_in / exits_required, min_door_in).

IBC 2021 §1005.3 (egress width = occupant load x capacity factor), §1006.2 / Table 1006.3.4 (exit-count thresholds), and §1010.1.1 (32 in minimum door clear width), by name.

The egress-width and exit-count relations are stated in the published IBC §1005.3 / §1006.2 / Table 1006.3.4; the arithmetic is public.

Estimate. AHJ and licensed professional govern.

Field names used by the API: occupant_load, sprinklered, path, min_door_in, exits_required, total_width_in, per_exit_in

• Exit count the §1006.2 / Table 1006.3.4 thresholds (49 / 500 / 1000) set the number of separate exits, which usually controls a small spaceIBC 2021 §1006.2
• Required width occupant load x the §1005.3 capacity factor, divided among the exitsIBC 2021 §1005.3
• Door minimum each leaf is floored at the §1010.1.1 32 in clear width; the sprinkler credit nearly halves the factorIBC 2021 §1010.1.1