Stair Calculator
Design safe and code-compliant stairs with precise measurements
Stair Measurements
Stair Calculation Results
Number of Steps
0
Riser Height
0"
Tread Depth
0"
Total Run
0"
Safety & Code Compliance
Stair Summary
Total Rise
0"
Total Run
0"
Stair Angle
0°
Stair Type
-
Stair Visualization
Diagram showing riser height and tread depth proportions
Building Code Requirements
| Parameter | Recommended | Your Stairs | Compliance |
|---|
Detailed Measurements
Complete measurements for building your stairs
| Step # | Riser Height | Tread Depth | Step Height | Step Depth |
|---|
Stair Building Tips
- Always check local building codes before construction
- Keep riser height consistent for safety
- Use the 7-11 rule (7" riser, 11" tread) as a guideline
- Ensure adequate headroom (at least 6'8")
- Install handrails for stairs with 4+ risers
- Consider non-slip surfaces for treads
Stair Formulas
Number of Steps: Total Rise ÷ Riser Height
Riser Height: Total Rise ÷ Number of Steps
Tread Depth: Total Run ÷ (Number of Steps - 1)
Stair Angle: atan(Riser Height ÷ Tread Depth)
Blondel's Formula: 2×Riser + Tread = 24-25 inches
For comfortable stairs: Riser × Tread ≈ 70-75 inches