Stair Calculator
Calculate rise, run, tread depth, and stringer length for stairs. Uses standard building code formulas for safe and comfortable stairs.
in
Floor to floor height
in
Minimum 10" for residential
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Stair Dimensions
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—
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Rise per Step
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in
Run per Step
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in
Number of Steps
—
risers
Stringer Length
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in
Total Rise
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in
Total Run
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in
Slope
—
°
2R+T
—
in
Calculation Breakdown
Step-by-step stair geometry
Stair Formulas
Key building code equations
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Construction Disclaimer: This calculator provides estimates based on standard building codes. Always consult local building codes and a structural engineer for proper stair design and safety requirements.