Stair Riser Calculator
Calculate stair riser height, tread depth, and total run with our comprehensive calculator. Perfect for DIY home projects, construction planning, and building code compliance.
Step 1: Stair Dimensions
Building Code Standards
Most building codes require riser heights between 4-8 inches (10-20 cm). The ideal riser height is 7-7.5 inches (17.8-19 cm) for comfortable climbing.
Step 2: Calculation Options
Tread Depth Guidelines
Standard tread depth is 10-11 inches (25-28 cm). The relationship between riser and tread is often expressed as: Riser + Tread = 17-18 inches.
Stair Calculation Results
Optimal Stair Configuration
Stair Visualization
Building Code Compliance Check
| Requirement | Standard | Your Stairs | Status |
|---|
Important Building Code Notes
Building codes vary by location. Always check local regulations. Most codes require uniform riser heights (max variation 3/8″) and minimum tread depths of 10″.
Detailed Step-by-Step Dimensions
| Step # | Riser Height | Tread Depth | Cumulative Rise | Cumulative Run |
|---|
Stair Calculation Formulas
Key Formulas
Number of Steps = Total Rise ÷ Desired Riser Height
Actual Riser Height = Total Rise ÷ Number of Steps
Tread Depth = Total Run ÷ (Number of Steps – 1)
Slope Angle = arctan(Total Rise ÷ Total Run)
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