Egress Width Calculator
Enter occupant load and egress type to get the IBC/NFPA minimum required clear width for doors, corridors, and stairways.
Egress Parameters
Minimum Required Egress Width
Enter occupant load and component type, then click Calculate.
IBC Table 1005.1 — Width Factors
| Component | Sprinklered | Not Sprinklered |
|---|---|---|
| Door / Door leaf | 0.15 in/occ | 0.20 in/occ |
| Corridor / Aisle / Ramp | 0.15 in/occ | 0.20 in/occ |
| Stairway | 0.20 in/occ | 0.30 in/occ |
Source: IBC 2021 Section 1005.1 / Table 1005.1
Summary
Enter occupant load and egress type to get the IBC/NFPA minimum required clear width for doors, corridors, and stairways.
How it works
- Enter the total occupant load (number of people) the egress path must serve.
- Select the egress component type: door, corridor/aisle, or stairway.
- Choose the occupancy type — some occupancies use different egress factors per IBC Table 1005.1.
- Click Calculate to see the minimum required clear width and applicable code reference.
- Review the breakdown showing the width factor applied and resulting dimension.
Use cases
- Verify corridor widths during early schematic design against IBC egress rules.
- Size door openings for assembly or educational occupancies by occupant count.
- Check stairway widths for multi-story buildings with high occupant loads.
- Confirm egress compliance before submitting plans for permit review.
- Cross-check contractor RFIs about egress width requirements on a job site.
- Educate architecture students on how occupant load drives egress geometry.
Frequently Asked Questions
Last updated: 2026-07-04 ·
Reviewed by Nham Vu