Staircase Calculator
Calculate Stairs
Formula
Risers = Total Rise / Target Riser | Run = (Risers-1) × Tread
Frequently Asked Questions
What is the standard stair riser height?
Building code typically requires risers between 4" and 7.75" (7.5" ideal), treads minimum 10" deep. The rule of thumb: 2 × riser + tread = 24-25". For a 9ft (108") floor-to-floor height, you need about 14-15 steps.
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