1. What is a Ramp Ratio Calculator?

Definition: This calculator determines the slope ratio (1:R) of a ramp based on its length and height.

Purpose: It helps architects, builders, and accessibility planners design ramps with proper slopes according to building codes and safety standards.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Ramp ratio (unitless, expressed as 1:R)
• \( L \) — Length of the ramp (feet)
• \( H \) — Height of the ramp (feet)

Explanation: The ramp length is divided by the height to determine how many units of length correspond to 1 unit of height.

3. Importance of Ramp Ratio Calculation

Details: Proper ramp ratios ensure accessibility (ADA recommends 1:12 for wheelchair ramps), safety, and compliance with building codes.

4. Using the Calculator

Tips: Enter the ramp length and height in feet. Both values must be > 0. The result is expressed as a ratio (e.g., 12 means a 1:12 slope).

5. Frequently Asked Questions (FAQ)

Q1: What does 1:12 ratio mean?
A: It means for every 1 inch of vertical rise, you need 12 inches (1 foot) of horizontal run.

Q2: What's the ADA recommended ramp ratio?
A: ADA requires a maximum slope of 1:12 (8.33%) for wheelchair ramps.

Q3: When would I use a steeper ratio?
A: Steeper ratios (e.g., 1:8) may be used for limited spaces but aren't ADA compliant. Always check local regulations.

Q4: How does this relate to slope percentage?
A: Slope percentage = (H/L) × 100. A 1:12 ratio equals 8.33% slope.

Q5: Does this calculator account for landings?
A: No, this calculates only the slope ratio. Landings should be added according to accessibility guidelines.