What Is the Quarter-Turn Calculator?
Design quarter-turn stairs with a 90-degree platform landing. The quarter-turn layout is identical in function to L-shaped stairs, with a flat landing at the turning point. This calculator determines the optimal layout, riser count per flight, and landing dimensions.
How to Use This Calculator
- Enter total rise and tread dimensions.
- Configure each flight and the landing between them.
- Review the footprint and per-flight riser distribution.
Why Accurate Quarter-Turn Calculations Matter
The 90° landing provides a fall-arrest point and allows furniture to be moved more easily than on straight stairs. The landing also offers a natural location for a window or decorative niche.
Building Code References
Related Tools
Frequently Asked Questions
What is a quarter-turn stair?+
A quarter-turn stair changes direction by 90° at a landing platform. It's functionally identical to an L-shaped staircase.