Stair Calculator
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Stair Anatomy Diagram
Understanding key measurements for safe stair design
FLOOR
LANDING
STRINGER
RISE
RUN
TOTAL RISE
TOTAL RUN
θ
Rise (Step Height)
Run (Tread Depth)
Stringer & Angle
Total Rise
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Stair Specifications
Enter your measurements to calculate stair dimensions
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Quick Examples - Click to fill
Standard Interior (9 ft)
Basement (2.7 m)
Deck Stairs (4 ft)
Porch (1 m)
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Measurement System
US Customary (inches)
Metric (centimeters)
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Calculation Mode
Automatic (optimal steps)
Manual (specify steps)
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Total Rise (Floor to Floor)
in
Total vertical height from bottom floor to top floor
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Tread Depth (Run per Step)
in
Horizontal depth of each step (10-11" typical)
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Number of Steps
Required only in manual mode
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Calculate Stair Dimensions