Stair Calculator

Calculate stair dimensions, risers, and treads according to building codes. Perfect for architects and contractors.

Stair Calculator

Calculate stair dimensions according to building codes

How to Use

  1. 1. Select the stair type (residential, commercial, or industrial)
  2. 2. Enter the floor-to-floor height
  3. 3. Enter the stair width
  4. 4. Optionally enter landing length
  5. 5. Click calculate to get detailed stair specifications

Features

  • Multiple stair types with different code requirements
  • Automatic riser and tread calculations
  • Building code compliance checking
  • Stair angle calculations
  • Safety recommendations
  • Detailed specifications and drawings

Pro Tips

  • 💡The 2R + T rule should equal 25-26 inches for optimal comfort
  • 💡Stair angles between 20-35 degrees are most comfortable
  • 💡Add handrails for stairs steeper than 30 degrees
  • 💡Consider intermediate landings for stairs with more than 16 risers