Stair Calculator — Free Online Calculator with Step-by-Step Guide
Design safe stairs with IBC-compliant rise/run calculations. Computes number of steps, riser height, tread depth, stringer length and angle.
Stair Calculator
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Tread Depth
11.00"
Total Run (Horizontal)
154.00"
Stringer Length Needed
186.39"
Stair Angle
34.3°
IBC Compliance
▲ ✅ Passes IBC requirements
Stringer Recommendation
2x12 lumber recommended
Stair Geometry Data
{"numberOfRisers":15,"actualRiserHeight":7,"numberOfTreads":14,"totalRunIn":154,"stringerLength":186.3894,"angleDeg":34.29,"ibcCompliant":true,"treadDepth":11,"unitSystem":"in"}
Scenario Comparison
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✅ Passes IBC requirements
Step Dimensions
Steps
15 steps
Riser
7.00"
Tread
11.00"
Angle
34.3°
Total Run
154.00"
Stringer Length
186.39"
Material Recommendation
2x12 lumber recommended
Linear feet of stringer needed: 15.5 ft
IBC Reference
Max Riser
7.75"
Min Tread
10"
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