Stair Calculator
Calculate stair dimensions including number of risers, treads, stringer length, and angle. Verify building code compliance and get material estimates.
Inputs
inches
inches
inches
inches
Results
Number of Risers
15
Number of Treads14
Actual Riser Height7.2"
Total Run (Horizontal)11.67 ft
Stringer Length14.73 ft
Stair Angle37.6°
Comfort RatingExcellent
Code ComplianceMeets code
Stringers Needed3
How to Use This Calculator
- Measure the total rise (floor to floor) in inches — a standard 9-foot ceiling is 108 inches.
- Enter your target riser height in inches (code maximum is 7.75 inches).
- Set the tread depth in inches (code minimum is 10 inches).
- Enter the stair width in inches (minimum 36 inches per IRC).
- Read the calculated number of risers and treads, actual riser height, total run, stringer length, stair angle, and code compliance status.
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