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:

• \( \text{Vertical Rise} \) — The vertical height difference (in meters or feet)
• \( \text{Horizontal Run} \) — The horizontal distance (in meters or feet)
• \( 100\% \) — Conversion factor to express as percentage

Explanation: The formula calculates the ratio of vertical change to horizontal distance and converts it to a percentage for easier interpretation.

3. Importance of Slope Calculation

Details: Slope percentage is crucial in civil engineering, construction, landscaping, road design, and accessibility planning. It helps determine appropriate grades for drainage, vehicle access, and pedestrian pathways.

4. Using the Calculator

Tips: Enter vertical rise and horizontal run in consistent units (both in meters or both in feet). Ensure both values are positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is considered a steep slope?
A: Generally, slopes above 25% are considered steep, while slopes above 40% 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 access?
A: ADA guidelines recommend maximum slopes of 5% for ramps, with 8.33% as the absolute maximum for short distances.

Q4: Can I use different units for rise and run?
A: No, use consistent units (both metric or both imperial) since the calculation is a ratio and units cancel out.

Q5: What does a 100% slope mean?
A: A 100% slope means the vertical rise equals the horizontal run, forming a 45-degree angle.