Deck Stair Calculator
A deck stair calculator helps determine proper stair dimensions for safe and code-compliant outdoor stairs. It calculates riser height, tread depth, and total run based on deck height and safety standards. This ensures comfortable climbing and prevents tripping hazards while adhering to building regulations (typically 7-11" riser-tread ratio).
Calculator
Formula
Number of Risers = Deck Height ÷ Riser Height (rounded up)
Adjusted Riser Height = Deck Height ÷ Number of Risers
Total Run = (Number of Treads) × Tread Depth (Treads = Risers - 1)
How to Use
1. Enter vertical deck height from ground
2. Input desired riser height (typically 7")
3. Add preferred tread depth (usually 11")
4. Click Calculate to get stair count and dimensions
5. Review results and adjust values if needed