Estimate the corridor width to draw for a single corridor segment. The calculator compares the
capacity-based width, the code minimum for the occupancy, and the practical rule-of-thumb width,
then adds an allowance for door projection and fixed obstructions.
This is a planning tool based on IBC 2018/2021 provisions. Confirm against your adopted code edition,
local amendments, and the authority having jurisdiction before finalizing drawings.
Corridor Width Result
Basis
Width (in)
Width (mm)
Capacity uses IBC Section 1005.3.2 (0.2 in per occupant; 0.15 in only where the reduced-factor exception
applies). Code minimums follow IBC Section 1020.2 as summarized in the article. Practical widths are
rules of thumb, not code requirements. Input the load that actually passes through the segment, and check
the 50 percent exit-loss rule (Section 1005.5) separately. Stairs and doors are not calculated here.