1. What is an ADA Ramp Length Calculator?

Definition: This calculator determines the minimum required length for an ADA-compliant ramp based on the height that needs to be overcome.

Purpose: It helps architects, builders, and property owners design wheelchair-accessible ramps that meet ADA standards.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Required ramp length (feet)
• \( H \) — Height to overcome (feet)

Explanation: ADA standards require a 1:12 slope ratio, meaning for every 1 inch of vertical rise, you need 12 inches (1 foot) of ramp run.

3. Importance of ADA Ramp Calculation

Details: Proper ramp length ensures accessibility compliance, safety for wheelchair users, and avoids potential legal issues.

4. Using the Calculator

Tips: Simply enter the vertical height that needs to be overcome in feet. The calculator will determine the minimum ramp length required.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum height for a single ramp run?
A: ADA requires a maximum 30-inch rise for any single ramp run. Higher elevations require multiple ramp sections with landings.

Q2: Are there exceptions to the 1:12 ratio?
A: For existing sites with space limitations, a 1:10 or 1:8 ratio may be allowed in some cases, but 1:12 is the standard.

Q3: What about landings?
A: This calculator provides the running slope length. Remember to include level landings (minimum 60" long) at top, bottom, and between ramp sections.

Q4: Does this include handrail requirements?
A: No, this only calculates length. ADA also requires handrails on both sides for ramps with a rise >6" or length >72".

Q5: What's the maximum allowable slope?
A: The absolute maximum under ADA is 1:8 (12.5% slope) for existing installations, but 1:12 (8.33%) is the preferred standard.