1. What is an ADA Ramp Slope Calculator?

Definition: This calculator determines the slope percentage of a ramp based on its height and length, checking compliance with ADA standards.

Purpose: It helps architects, builders, and accessibility professionals ensure ramps meet ADA requirements for safe wheelchair access.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Slope percentage (%)
• \( H \) — Vertical height (feet)
• \( L \) — Horizontal length (feet)

Explanation: The ramp height is divided by its length, then multiplied by 100 to convert to a percentage.

3. ADA Ramp Slope Requirements

Details: ADA standards require a maximum slope of 1:12 (8.33%) for wheelchair ramps. Steeper slopes may require handrails or are prohibited.

4. Using the Calculator

Tips: Enter the vertical rise (height) and horizontal run (length) in feet. The calculator shows both slope percentage and ADA compliance.

5. Frequently Asked Questions (FAQ)

Q1: What's the maximum ADA-compliant slope?
A: The maximum slope is 8.33% (1:12 ratio) for most ramps. Some exceptions allow steeper slopes for existing sites.

Q2: How do I measure ramp length?
A: Measure the horizontal projection (run), not the sloped surface distance.

Q3: What if my slope exceeds 8.33%?
A: Consider lengthening the ramp, adding switchbacks, or installing a platform lift if space is limited.

Q4: Are there different requirements for short ramps?
A: Yes, ramps with ≤6" rise can have steeper slopes (up to 10% for ≤30" runs).

Q5: Does this include landing requirements?
A: No, ADA requires level landings at top, bottom, and every 30' of ramp run.