How to Use This Calculator
- Enter the horizontal length of your ramp in meters.
- Enter the vertical height of your ramp in meters.
- Click the "Calculate" button to determine the Ramp Travel Index.
- The calculator will also provide an accessibility rating based on the calculated RTI.
Understanding the Ramp Travel Index (RTI)
The Ramp Travel Index is a dimensionless value that represents the effort required to traverse a ramp. It is calculated by dividing the length of the ramp by its height and multiplying by 100.
Accessibility Guidelines
- Excellent (RTI ≤ 20): Very easy to use, suitable for most accessibility requirements.
- Good (20 < RTI ≤ 35): Reasonably accessible, suitable for moderate accessibility needs.
- Fair (35 < RTI ≤ 50): Moderately challenging, may require additional accessibility features.
- Poor (50 < RTI ≤ 100): Difficult to use, may not meet accessibility standards for many users.
- Very Poor (RTI > 100): Extremely difficult to use, not suitable for accessibility purposes.
Practical Applications
This calculator is particularly useful for architects, engineers, and builders designing accessible facilities such as:
- Public buildings and government offices
- Commercial establishments and retail spaces
- Residential homes
- Schools and educational institutions
- Healthcare facilities
Important Notes
The Ramp Travel Index is one factor to consider when designing accessible ramps. Other important considerations include:
- Maximum slope allowed by local building codes
- Non-slip surface requirements
- Handrail installation
- Landings at the top and bottom of the ramp