1 in 12 Gradient Calculator
Enter the vertical rise to calculate the required horizontal run for a 1:12 gradient.
Here’s a comprehensive table summarizing key information about a 1:12 gradient for wheelchair ramps:
| Aspect | Details |
|---|---|
| Gradient Ratio | 1:12 |
| Percentage Slope | 8.33% |
| Angle | 4.76° |
| Description | For every 1 unit of rise, there are 12 units of run |
| Recommended Use | Independent wheelchair use1 |
| Maximum Rise | 166mm (6.5 inches) for a single ramp section1 |
| Ramp Length Calculation | Height of step × 12 = Minimum ramp length1 |
| Building Regulations | Minimum gradient required for installed ramps3 |
| ADA Compliance | Maximum slope allowed for new constructions5 |
| Residential Use | Commonly required for residential situations3 |
| Public Access | May require a shallower 1:15 or 1:20 gradient3 |
| Assisted Use | Can be steeper (up to 1:8) for shorter distances with assistance1 |
| Landings | Required every 10m (32.8 feet) of ramp length1 |
| Ramp Width | Minimum 1.5m (59 inches) wide1 |
| Surface | Must have a non-slip surface1 |
| Handrails | Continuous suitable handrail required on each side1 |
This table provides a quick reference for the most important aspects of a 1:12 gradient wheelchair ramp, including its measurements, recommended uses, and key regulations.