1. What is a PWD Ramp Slope Calculator?

Definition: This calculator determines the slope of a ramp for persons with disabilities based on vertical rise and horizontal run measurements.

Purpose: It helps architects, builders, and accessibility consultants ensure ramps meet ADA and other accessibility standards.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Slope (unitless ratio or percentage)
• \( Rise \) — Vertical height change (feet or meters)
• \( Run \) — Horizontal distance (feet or meters)

Explanation: The slope is calculated by dividing the vertical rise by the horizontal run, then converted to both ratio (1:X) and percentage formats.

3. Importance of Proper Ramp Slope

Details: ADA guidelines recommend a maximum slope of 1:12 (8.33%) for wheelchair ramps. Proper slope ensures safety and accessibility.

4. Using the Calculator

Tips: Enter the vertical rise and horizontal run in consistent units (both feet or both meters). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the maximum allowable slope for ADA ramps?
A: 1:12 slope (8.33%) is the maximum for ADA-compliant ramps. 1:16 (6.25%) is preferred where space allows.

Q2: How do I measure rise and run?
A: Rise is the vertical height difference between levels. Run is the horizontal projection of the ramp.

Q3: When is a steeper slope acceptable?
A: Temporary ramps may use 1:8 (12.5%) for short rises. Always check local regulations.

Q4: What about ramp landings?
A: ADA requires a 60" landing at top/bottom and every 30' of run. This calculator doesn't account for landings.

Q5: How does slope affect ramp length?
A: For each inch of rise, you need 12 inches of run (at 1:12 slope). Higher rises require proportionally longer ramps.