1. What is Ramp Slope Ratio?

The Ramp Slope Ratio represents the relationship between vertical rise and horizontal run in ramp construction and design. It is commonly expressed as a ratio (e.g., 1:12) and indicates the steepness of the ramp.

2. How Does the Calculator Work?

The calculator uses the slope ratio formula:

Where:

• \( Rise \) — Vertical height (units)
• \( Run \) — Horizontal distance (units)
• \( Ratio \) — Slope ratio (unitless)

Explanation: The ratio indicates how many units of horizontal run are required for each unit of vertical rise.

3. Importance of Slope Ratio Calculation

Details: Accurate slope ratio calculation is crucial for designing accessible ramps, determining proper incline for wheelchair access, and ensuring compliance with building codes and safety standards.

4. Using the Calculator

Tips: Enter rise and run values in consistent units (inches, feet, meters, etc.). Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum slope ratio for wheelchair ramps?
A: The ADA recommends a maximum slope of 1:12 for wheelchair ramps, meaning 1 inch of rise for every 12 inches of run.

Q2: How do I convert slope ratio to percentage?
A: Multiply the ratio by 100. For example, a 1:12 ratio equals approximately 8.33% slope.

Q3: What is the minimum slope ratio for drainage?
A: For proper drainage, a minimum slope of 1:50 (2%) is typically recommended.

Q4: Can this calculator be used for roof slopes?
A: Yes, the same ratio calculation applies to roof slopes, though roof slopes are often expressed differently (e.g., 4:12 pitch).

Q5: What units should I use?
A: Use any consistent units (inches, feet, meters, etc.) as long as both rise and run are in the same unit of measurement.