What Is the Skirt Board Calculator?
Calculate skirt board length, angle cuts, and material requirements. Skirt boards (also called skirting or stair trim) are the finish boards installed against the wall along a staircase. They cover the gap between the stair components and the drywall, providing a clean finished appearance.
How to Use This Calculator
- Enter total rise, total run, and the desired skirt board width.
- Review the calculated board length (hypotenuse), cut angle, and material needed.
- Use the angle for miter cuts on your miter saw or circular saw.
Why Accurate Skirt Board Calculations Matter
Skirt boards run diagonally along the wall at the stair angle. The length is the hypotenuse of the rise-and-run triangle, plus extra length at top and bottom for transitions. Accurate angle calculation ensures tight joints at the top and bottom landings.
Building Code References
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Frequently Asked Questions
What size board for a stair skirt?+
A 1×12 (¾" × 11¼") is the most common skirt board size. This width covers the stair components when installed against the wall. Some installations use 1×10 for lower-profile stairs.