Stair Stringer Calculator
Calculate stair stringer dimensions, riser height, tread depth, and stringer layout for your stair building project. Get precise measurements for safe, code-compliant stairs.
Step 1: Stair Dimensions
Stair Building Codes
Most building codes require riser heights between 6-8 inches and tread depths between 9-12 inches. The ideal ratio is 2R + T = 25 inches (17-18 cm in metric).
Step 2: Stringer Details
About Stair Stringers
Stringers are the structural supports that hold up the treads and risers. They’re typically cut from 2×12 lumber with notches for each step. Proper calculation ensures safety and compliance with building codes.
Stair Stringer Calculation Results
Stringer Length Required
Stringer Visualization
Stair Stringer Cut List
Stringer Cuts (for one stringer):
Material Requirements
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Stair Analysis
Stair Safety and Code Compliance
Based on your dimensions, this stair design meets typical building code requirements. For maximum safety and comfort, the ideal stair has a riser height between 7-7.75 inches and a tread depth between 10-11 inches.
Stair Formula
2R + T = 25 inches (17-18 cm in metric)
This formula creates comfortable, safe stairs. R is riser height, T is tread depth. Your values: 2(7.71) + 10 = 25.42 inches
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