Fire Egress Calculator

Calculate exit width, number of exits, and travel distance based on occupant load per IBC.

Floor Area (sq ft)

Occupant load = floor area ÷ load factor (ft²/person)

Occupancy Type

Assembly: 7–15 ft²/person; Business: 100 ft²/person; Educational: 20 ft²/person

Number of Floors

≥500 occupants on any floor: minimum 3 exits; ≥1,000: minimum 4 exits per IBC §1006.3

Sprinkler System

Sprinklered travel distance bonus: +50 ft for most occupancies per IBC Table 1017.2

Tab to move between fields

Occupant Load

100

Minimum Exits Required

Total Stair Width (inches)15

Total Level Exit Width (inches)12

Width per Exit (inches)36

Max Travel Distance (ft)300

Max Common Path (ft)100

How to Use This Calculator

Enter Floor Area (sq ft), Occupancy Type, and Number of Floors.
Set Sprinkler System.
Review Occupant Load and Minimum Exits Required.
Use Total Stair Width (inches) and Total Level Exit Width (inches) to inform your decision.

How the result changes with Floor Area (sq ft)

Floor Area (sq ft): Total floor area of the space. IBC Table 1004.5 and NFPA 101 Table 7.3.1.2 define occupant load factors by occupancy type.
Occupancy Type: IBC occupancy classification per Chapter 3. 1=Assembly (7-15 ft²/person), 2=Business (100 ft²/person), 3=Educational (20 ft²/person), 4=Mercantile (60 ft²/person), 5=Industrial (100 ft²/person).
Number of Floors: Total number of stories in the building. IBC §1006 requires additional exits for buildings over certain occupant loads or heights.
Sprinkler System: NFPA 13 sprinkler system. IBC §1017 allows increased travel distance in sprinklered buildings: 250 ft for Business vs. 200 ft unsprinklered.

Identify Input Parameters
4 parameters
Floor Area (sq ft) = 10000, Occupancy Type = 2, Number of Floors = 3, Sprinkler System = 1 = 4 input(s) provided
Calculate Occupant Load
Occupant Load
100 = 100
Calculate Minimum Exits Required
2 = 2
Calculate Total Stair Width
Total Stair Width
15 = 15
Calculate Total Level Exit Width
Total Level Exit Width
12 = 12