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 vertical rise divided by the horizontal run, multiplied by 100 to convert to percentage form.

2. How Does the Calculator Work?

The calculator uses the slope percentage formula:

Where:

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

Explanation: This formula calculates the ratio of vertical change to horizontal distance and expresses it as a percentage for easy interpretation.

3. Importance of Slope Calculation

Details: Slope percentage calculations are essential in construction, civil engineering, landscaping, road design, and accessibility planning. They help ensure proper drainage, stability, and compliance with building codes.

4. Using the Calculator

Tips: Enter rise and run values in feet. Both values must be positive numbers greater than zero. The calculator will automatically compute the slope percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a steep slope?
A: Generally, slopes above 15% are considered steep, while slopes above 25% are very steep and may require special engineering considerations.

Q2: How does slope percentage relate to degrees?
A: Slope percentage = tan(angle in degrees) × 100. For example, a 45° angle equals 100% slope.

Q3: What is the maximum slope for wheelchair accessibility?
A: ADA guidelines recommend a maximum slope of 8.33% (1:12 ratio) for wheelchair ramps.

Q4: Can I use different units for rise and run?
A: Yes, as long as both rise and run use the same units, the percentage calculation will be accurate.

Q5: What does a negative slope percentage mean?
A: Negative slope indicates a downward slope or decline. This calculator handles positive values for upward slopes.