Stair Calculator

Calculate the dimensions for your staircase project, ensuring they meet safety standards and building codes. This calculator helps you determine the number of steps needed and the proper dimensions for each step.

How to Use This Calculator

1. Enter the total height (rise) from floor to floor
2. Input the total horizontal space available (run)
3. The calculator will provide:
   • Number of steps needed
   • Individual step rise height
   • Individual step run depth
   • Total staircase length

Understanding Stair Dimensions

Standard stair measurements typically follow these guidelines:

• Step rise (height): 6-8 inches (optimal: 7 inches)
• Step run (depth): 9-11 inches (optimal: 10 inches)
• Stair width: Minimum 36 inches
• Headroom: Minimum 6’8” (80 inches)

Important Considerations

• Building codes vary by location
• Consistency is crucial - all steps must be uniform
• Proper dimensions ensure safety and comfort
• Consider handrail requirements
• Account for landing spaces

Common Applications

• Interior residential stairs
• Deck stairs
• Basement stairs
• Attic access stairs
• Porch steps

Safety Tips

• Keep rise and run consistent throughout
• Ensure adequate lighting
• Install proper handrails
• Use non-slip materials
• Follow local building codes

Frequently Asked Questions

Q: Why is step consistency important? A: Uniform steps reduce tripping hazards and make stairs safer to use. Even small variations can cause accidents.

Q: What’s the ideal rise-to-run ratio? A: The ideal ratio follows the formula: 2 rises + 1 run = 24-25 inches. This creates comfortable, safe stairs.

Q: Do I need a landing? A: Most building codes require a landing for stairs with more than a certain number of steps (typically 12-16) or for stairs that change direction.