1. What is Slope Percentage?

Slope percentage is a measure of the steepness or incline of a surface, expressed as a percentage. It represents the ratio of vertical rise to horizontal run, multiplied by 100. This calculation is crucial for designing accessible ramps and determining safe incline angles.

2. How Does the Calculator Work?

The calculator uses the slope percentage formula:

Where:

• \( \text{Rise} \) — Vertical height difference (inches)
• \( \text{Run} \) — Horizontal distance (inches)
• \( 100\% \) — Conversion factor to percentage

Explanation: The formula calculates the ratio of vertical change to horizontal distance and converts it to a percentage for easy interpretation and compliance with accessibility standards.

3. Importance of Slope Calculation for Accessibility

Details: Accurate slope calculation is essential for designing ramps that comply with accessibility standards (ADA, building codes). Proper slope ensures safe and comfortable use for wheelchair users, people with mobility impairments, and general pedestrian traffic.

4. Using the Calculator

Tips: Enter rise (vertical height) and run (horizontal distance) in inches. Both values must be positive numbers greater than zero. The calculator will compute the slope percentage instantly.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum slope percentage for accessible ramps?
A: According to ADA standards, the maximum slope for accessible ramps is 8.33% (1:12 ratio). For existing buildings, 10% may be acceptable in some cases.

Q2: How do I convert slope percentage to degrees?
A: Use the formula: degrees = arctan(slope percentage / 100). For example, 8.33% slope equals approximately 4.76 degrees.

Q3: What is the minimum run required for ramps?
A: ADA requires a minimum run of 60 inches (5 feet) between landings. Landings are required every 30 feet of run and at top/bottom of ramps.

Q4: Are there different slope requirements for different users?
A: Yes, while 8.33% is standard for public access, some applications may allow steeper slopes (up to 20%) for limited-use situations, but these are not considered fully accessible.

Q5: How does slope affect wheelchair users?
A: Steeper slopes require more effort to ascend and can be dangerous when descending. Proper slope ensures independent and safe mobility for wheelchair users.