Stair Calculator
Calculate stair dimensions, riser height, tread depth, and total run for your construction or remodeling project. Ensure code compliance and safety with accurate measurements.
Step 1: Basic Dimensions
Building Code Guidelines
Most residential codes require riser heights between 4-7.75 inches and tread depths of at least 10 inches. The ideal relationship is 2×Riser + Tread = 25 inches.
Step 2: Detailed Specifications
Stair Safety Tips
All steps should have uniform riser height and tread depth to prevent tripping. Consider adding handrails if stairs have more than 3 risers, and ensure proper lighting.
Stair Calculation Results
Riser Height
Compliance Check
✓ These dimensions meet standard residential building code requirements for riser height and tread depth.
Stair Type Comparison
| Stair Type | Max Riser | Min Tread | Typical Use |
|---|
Code Requirements
Building codes vary by location. Always check local regulations before construction. The International Residential Code (IRC) specifies maximum riser height of 7.75″ and minimum tread depth of 10″.
Stair Visualization
Visual representation of your stair dimensions (not to scale).
Stair Calculation Formulas
Number of Steps = Total Rise ÷ Riser Height
To calculate number of steps: Divide total rise (floor to floor height) by desired riser height. Round up to nearest whole number, then recalculate actual riser height.
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