Stair Calculator
Calculate rise, run, and number of stairs for any staircase.
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How It Works
Calculates steps: total rise divided by riser height. IRC code: riser max 7.75 inches, tread min 10 inches.
Formula
Steps = Total Rise / RiseQuick Reference
Common calculations — results you can verify instantly.
9ft ceiling
108in/7in rise
15-16 steps
8ft ceiling
96in/7in rise
13-14 steps
Code max riser
IRC standard
7.75 inches max
Tips & Shortcuts
Comfortable formula: 2 x riser + tread = 24-26 inches.
Standard residential: 7-inch rise, 11-inch tread.
Common Mistakes
Using floor area instead of actual rise height
Measure actual vertical height from bottom floor to top floor.
Ignoring building codes
IRC max riser 7.75 inch, min tread 10 inch. Check local codes.
Frequently Asked Questions
108 inches / 7 inch rise = approximately 15-16 steps.
7 inches is most comfortable standard for residential stairs.
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