1. What is a Ramp Angle Calculator?

Definition: This calculator determines the angle of inclination (θ) for a ramp based on its height (H) and length (L).

Purpose: It helps architects, builders, and accessibility planners design ramps with appropriate slopes for safety and compliance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \theta \) — Ramp angle (degrees)
• \( H \) — Vertical height (feet)
• \( L \) — Horizontal length (feet)

Explanation: The arctangent function converts the ratio of height to length into an angle measurement.

3. Importance of Ramp Angle Calculation

Details: Proper ramp angles ensure accessibility (ADA recommends ≤ 4.8°), safety, and compliance with building codes.

4. Using the Calculator

Tips: Enter the vertical height and horizontal length in feet. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the maximum recommended ramp angle?
A: ADA recommends 1:12 slope (4.8°). Steeper ramps may require handrails or are for limited use.

Q2: How does ramp angle affect wheelchair users?
A: Steeper angles make pushing wheelchairs more difficult and can be dangerous if too steep.

Q3: Can I use this for vehicle ramps?
A: Yes, but vehicle ramps often have steeper angles (10-15° for personal vehicles).

Q4: What if I only know the hypotenuse (ramp surface length)?
A: First calculate horizontal length: \( L = \sqrt{R^2 - H^2} \) where R is ramp surface length.

Q5: How does angle relate to slope percentage?
A: Slope percentage = tan(θ) × 100. A 4.8° angle ≈ 8.3% slope.