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.

2. How Does the Calculator Work?

The calculator uses the slope percentage formula:

Where:

• \( \text{rise} \) — Vertical change (height difference)
• \( \text{run} \) — Horizontal change (distance)

Explanation: The formula calculates how many units the surface rises (or falls) for every 100 units of horizontal distance.

3. Importance of Slope Calculation

Details: Slope percentage is crucial in construction, civil engineering, landscaping, and road design. It helps determine drainage efficiency, accessibility compliance, and structural stability.

4. Using the Calculator

Tips: Enter both rise and run values in the same units (meters, feet, etc.). The run value must be greater than zero. The calculator will output the slope as a percentage.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between slope percentage and slope angle?
A: Slope percentage is a ratio expressed as a percentage, while slope angle is measured in degrees. They're related but represent the incline differently.

Q2: What is considered a steep slope?
A: Generally, slopes above 15-20% are considered steep. Slopes above 30% are very steep and may require special engineering considerations.

Q3: How is slope percentage used in accessibility design?
A: The Americans with Disabilities Act (ADA) recommends ramp slopes not exceed 8.33% (1:12 ratio) for wheelchair accessibility.

Q4: Can slope percentage be negative?
A: Yes, a negative slope percentage indicates a downward slope or decline rather than an incline.

Q5: How do I convert slope percentage to degrees?
A: To convert slope percentage to degrees, use the formula: angle = arctan(slope percentage/100). Many online calculators can perform this conversion.