1. What is a Ramp Length Calculator?

Definition: This calculator estimates the length of ramp needed based on the height to overcome and the desired slope.

Purpose: It helps architects, builders, and accessibility planners determine proper ramp dimensions for ADA compliance and safe access.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L \) — Length of ramp (feet)
• \( H \) — Height to overcome (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 length ensures ADA compliance, safety for wheelchair users, and proper accessibility for all individuals.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the standard slope for ADA ramps?
A: ADA requires a maximum 1:12 slope (8.33% grade), meaning 1 foot of rise requires 12 feet of ramp.

Q2: How do I convert slope percentage to ratio?
A: Divide the percentage by 100. For example, 8.33% becomes 0.0833.

Q3: When would I use a different slope?
A: Steeper slopes may be used for residential applications where space is limited, but never steeper than 1:8 for ADA compliance.

Q4: Does this include landing space?
A: No, remember to add landing space (minimum 5 feet) at top and bottom of ramp.

Q5: How does ramp length affect design?
A: Longer ramps may require switchbacks or rest platforms for every 30 inches of rise.