What Is the Landing Size Calculator?
Calculate required landing dimensions for code-compliant stair landings at turns, tops, and bottoms of stairways. Landings provide rest points, break fall paths, and accommodate door swings. This calculator checks IRC R311.7.6 requirements for depth, width, and door clearance.
How to Use This Calculator
- Enter the stair width - the landing depth must equal or exceed this dimension.
- Set the landing width and depth.
- If a door swings over the landing, enter the door swing dimension.
- Review compliance checks for depth, width, and door clearance.
Why Accurate Landing Size Calculations Matter
Undersized landings are a common code violation that inspectors catch during framing inspection. The IRC requires landing depth to be at least equal to the stair width, and doors must not swing over the landing in a way that reduces the depth below code minimums.
Building Code References
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Frequently Asked Questions
How deep does a stair landing need to be?+
The IRC requires landing depth to be at least equal to the width of the stairway it serves, measured in the direction of travel. For a 36-inch-wide stair, the landing must be at least 36 inches deep.