1. What is Ramp Ratio?

Ramp ratio represents the relationship between the horizontal distance (run) and vertical height (rise) of a ramp. It's expressed as a unitless ratio (e.g., 12:1) that indicates how many units of horizontal distance are needed for each unit of vertical rise.

2. How Does the Calculator Work?

The calculator uses the simple ratio formula:

Where:

• \( Run \) — Horizontal distance (in consistent units)
• \( Rise \) — Vertical height (in consistent units)

Explanation: The ratio is calculated by dividing the run by the rise, resulting in a value that represents how many units of horizontal distance correspond to one unit of vertical rise.

3. Importance of Ramp Ratio Calculation

Details: Proper ramp ratios are crucial for accessibility compliance, safety, and functionality. Different applications (wheelchair ramps, vehicle ramps, etc.) have specific ratio requirements to ensure safe and comfortable use.

4. Using the Calculator

Tips: Enter both run and rise values in the same units (meters, feet, etc.). Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard ratio for wheelchair ramps?
A: The ADA typically requires a 1:12 ratio for wheelchair ramps, meaning 1 foot of rise requires 12 feet of run.

Q2: Can I use different units for run and rise?
A: No, both measurements must use the same unit system for the ratio to be meaningful and accurate.

Q3: What's the difference between ratio and slope?
A: Ratio is run:rise while slope is typically expressed as a percentage (rise/run × 100) or angle.

Q4: Why is ramp ratio important in construction?
A: Proper ratios ensure accessibility compliance, user safety, and functionality for people with mobility challenges.

Q5: How do I convert ratio to slope percentage?
A: Slope percentage = (Rise/Run) × 100. For example, a 12:1 ratio equals approximately 8.33% slope.