1. What is a Ramp Calculator?

Definition: This calculator determines the required length of a ramp based on the vertical height 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)
• \( H \) — Vertical height (feet)
• \( S \) — Slope ratio (unitless)

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

3. Importance of Ramp Calculation

Details: Proper ramp calculation ensures ADA compliance (1:12 slope maximum), safety, and usability for wheelchair users and others with mobility challenges.

4. Using the Calculator

Tips: Enter the vertical height in feet and the desired slope ratio (default 0.0833 for 1:12 ADA 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 run.

Q2: How do I convert slope ratio to percentage?
A: Multiply the slope ratio by 100. For example, 0.0833 × 100 = 8.33% grade.

Q3: When would I use a steeper slope?
A: Only for non-ADA applications where space is limited, but steeper slopes reduce accessibility (max 1:8 for residential).

Q4: Does this include landing requirements?
A: No, ADA requires a 5'×5' landing at top, bottom, and every 30' of horizontal run.

Q5: How do I calculate for metric units?
A: Use meters for both height and length - the formula works the same way.