Ramp Slope Ratio Calculator

Slope Ratio Formula:

\[ \text{Slope Ratio} = \text{Run} : \text{Rise} \] \[ \text{Percentage} = \left( \frac{\text{Rise}}{\text{Run}} \right) \times 100\% \]

Slope Ratio:

Slope Percentage:

Accessibility Compliant (1:12 max):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Ramp Slope Ratio?

The Ramp Slope Ratio represents the relationship between the horizontal distance (run) and vertical height (rise) of a ramp. It is expressed as Run:Rise and is crucial for designing accessible ramps that meet building codes and accessibility standards.

2. How Does the Calculator Work?

The calculator uses the following formulas:

\[ \text{Slope Ratio} = \text{Run} : \text{Rise} \] \[ \text{Slope Percentage} = \left( \frac{\text{Rise}}{\text{Run}} \right) \times 100\% \]

Where:

\( \text{Run} \) — Horizontal distance of the ramp
\( \text{Rise} \) — Vertical height change of the ramp
\( \text{Slope Ratio} \) — Ratio of run to rise (e.g., 12:1)
\( \text{Slope Percentage} \) — Percentage grade of the slope

Explanation: The slope ratio indicates how many units of horizontal distance are needed for each unit of vertical rise. A 12:1 ratio means 12 units of run for every 1 unit of rise.

3. Importance of Slope Calculation

Details: Proper slope calculation is essential for designing accessible ramps that comply with ADA (Americans with Disabilities Act) standards and other building codes. The maximum allowable slope for wheelchair ramps is typically 1:12 (8.33%).

4. Using the Calculator

Tips: Enter the horizontal distance (run) and vertical height (rise) in meters. Both values must be positive numbers greater than zero. The calculator will automatically compute the slope ratio, percentage, and check accessibility compliance.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum slope for wheelchair ramps?
A: The ADA requires a maximum slope of 1:12 (8.33%) for wheelchair ramps. Some jurisdictions may allow steeper slopes for existing buildings with limitations.

Q2: How do I measure run and rise?
A: Run is the horizontal distance from the start to end of the ramp. Rise is the vertical height difference between the top and bottom of the ramp.

Q3: What about ramp landings?
A: Ramps longer than 6 meters (20 feet) require intermediate landings. Landings should be at least 1.5 meters (5 feet) long and as wide as the ramp.

Q4: Are there different requirements for different types of ramps?
A: Yes, temporary ramps, residential ramps, and public access ramps may have different requirements. Always check local building codes.

Q5: What if my ramp doesn't meet accessibility standards?
A: If your calculated slope is steeper than 1:12, consider lengthening the ramp, reducing the rise, or adding switchbacks with landings to achieve compliance.