1. What is a Ramp Length and Height Calculator?

Definition: This calculator determines the required ramp length based on the height difference and desired slope.

Purpose: It helps architects, builders, and accessibility planners design ramps that meet safety standards and usability requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Ramp length (feet)
• \( H \) — Height difference (feet)
• \( S \) — Slope ratio (unitless, e.g., 0.0833 for 1:12 slope)

Explanation: The height is divided by the slope ratio to determine the required ramp length.

3. Importance of Proper Ramp Calculation

Details: Correct ramp calculations ensure ADA compliance, safety, and proper accessibility for wheelchairs and mobility devices.

4. Using the Calculator

Tips: Enter the height difference in feet and the desired slope ratio (default 0.0833 for 1:12 slope). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a standard slope for accessibility ramps?
A: The ADA recommends a maximum slope of 1:12 (8.33% or 0.0833 ratio) for wheelchair ramps.

Q2: How do I convert slope percentage to ratio?
A: Divide the percentage by 100 (e.g., 8.33% becomes 0.0833).

Q3: When would I use a different slope?
A: Steeper slopes may be used for limited spaces (max 1:8 for residential), but check local regulations.

Q4: Does this calculation include landing areas?
A: No, landing areas should be added separately to the total ramp length.

Q5: How does height affect ramp design?
A: Greater heights require longer ramps or intermediate landings (required every 30" of rise for ADA).