Stair Calculator
Calculate stair dimensions, code compliance, and material requirements
Stair Configuration
Enter measurements and select building requirements
Enter total height (required) and either total horizontal distance, desired number of steps, or preferred riser height.
Floor to floor height
Available horizontal space
Advanced Options
inches
Building Code Requirements
Rise Requirements:
Min: 1.57 in
Max: 3.05 in
Run Requirements:
Min: 4.33 in
Max: 5.51 in
Handrail Height:
13.39 - 15.35 in
Design Guidelines
Comfort Rules:
- 2R + T = 24-25 inches (ideal)
- Rise should be 7-7.5 inches
- Run should be 10-11 inches
- Consistent dimensions throughout
Safety Considerations:
- Handrails required for 4+ steps
- Landings for long flights
- Proper lighting and visibility
- Non-slip tread surfaces