What is the correct width measurement approach for capacity components?

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In capacity calculations, what matters is the actual space people can use, not the nominal size of the opening or component. That usable space is the clear width—the unobstructed distance between finished surfaces along the path.

For doors, this means the width of the opening when the door is in use, accounting for the door itself and frame so you’re measuring the true passage a person experiences. For stairs, ramps, and corridors, it’s the distance between the finished surfaces that remains free of obstacles, including handrails, trim, or any protrusions along the path. Using clear width for every component ensures your capacity estimates reflect real movement conditions and keeps safety and code requirements aligned.

Using minimum width would ignore variations and obstructions along the route, potentially underestimating or overestimating how many people can move through at once. Applying clear width consistently avoids that mismatch and provides a true picture of egress capacity.