Stair Tread vs Ramp Slope (Accessibility)
**Stairs** need consistent rise and run per code. **Ramps** trade length for gentler **slope** (often 1:12 max for accessibility)—same total rise, different footprint.
Step by step
1. Measure total rise
Floor-to-floor height drives both designs.
2. Check max slope
Ramps longer but wheelchair-friendly; stairs shorter footprint.
3. Landings
Stairs need landings at intervals; ramps may need level platforms.
Stairs vs ramp
Many projects need both—stairs for space, ramp for access.
- Stairs: Compact; precise rise/run; code stringers.
- Ramp: Longer run; slope %; grip surfaces.
Use our calculators
Common mistakes
- Steep ramp to save lumber
- Uneven stair rises
FAQ
What slope is 1:12?
About 8.3% grade—1 inch rise per 12 inches run.