Interactive Stair Building & Stringer Tool
Stair Stringer Calculator
Calculate riser heights, tread depths, stringer lengths, and stair angles with real-time code compliance validation and an interactive live diagram.
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Input Dimensions Units
ft
in
in
in
📐
Live Stringer Diagram Calculated Results
⚠ Disclaimer: This calculator is a planning aid. Always verify results against your local building codes and regulations before construction. Consult a licensed professional for structural requirements.
Step-By-Step Process
How to Layout Stair Stringers
01
Measure Total Rise
Measure the vertical distance from the lower finished floor to the upper finished floor.
02
Calculate and Check Code
Enter details into our calculator to check if your riser height and stair angle comply with building codes.
03
Mark and Cut Stringer
Use the generated framing square heel positions to mark your cuts on a 2x12 lumber board.
Quick Reference Standards
Recommended Stair Angles and Ratios
Staircase design guidelines for optimal safety and walking rhythm.
Metric
Minimum
Maximum / Target
Ideal Stair Angle Range
30°
37° (Ideal)
Standard Riser Height Limit
4" (102 mm)
7.75" (196 mm)
Standard Tread Depth Limit
10" (254 mm)
12"+ (305 mm)
Riser + Tread Sum (7-11 rule)
17" (432 mm)
18" (457 mm)
Headroom Clearance
80" (2032 mm)
84"+ (2134 mm)