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Stair Calculator
Calculate staircase riser heights, tread counts, stair angles, and stringer lengths. Checks residential building codes (IRC) and Blondel's comfort formula.
Inputs Configuration
Calculation Failure
Inputs must be positive numbers.
Calculation Output Status
Calculation Error
Error
Understanding the Stair Calculator Sizing & Mechanics
Calculate staircase riser heights, tread counts, stair angles, and stringer lengths. Checks residential building codes (IRC) and Blondel's comfort formula.
Why This Matters
- **Safety & Accessibility**: Stairs are the most common source of household accidents. Small variations in riser heights (even $3/8$ inch) create tripping hazards.
- **Code Compliance**: Construction inspectors will reject staircases that exceed local codes (e.g., maximum 7.75" rise, minimum 10" tread under IRC).
- **Material Efficiency**: Helps carpenters purchase the correct length of 2x12 lumber for stringers (e.g., 10ft, 12ft, 14ft boards) without costly waste.
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