1. What is Slope Percentage?

Slope percentage is a way to express the steepness of a slope as a percentage. It represents the vertical rise per 100 units of horizontal run, making it easier to understand and compare slopes across different contexts.

2. How Does the Calculator Work?

The calculator uses the slope percentage formula:

Where:

• \( Rise \) — Vertical height difference
• \( Run \) — Horizontal distance
• \( Slope \% \) — Slope expressed as percentage

Explanation: The formula calculates the ratio of vertical rise to horizontal run and converts it to a percentage by multiplying by 100.

3. Importance of Slope Calculation

Details: Slope percentage is crucial in construction, civil engineering, landscaping, road design, and accessibility planning. It helps determine if slopes are safe for vehicles, pedestrians, or construction.

4. Using the Calculator

Tips: Enter rise and run values in the same units (feet, meters, etc.). Both values must be positive numbers greater than zero. The calculator will output the slope as a 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% 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 slope percentage exceed 100%?
A: Yes, slopes can exceed 100%. A 100% slope equals a 45° angle, and slopes greater than 100% are steeper than 45°.

Q5: How is slope used in drainage design?
A: Minimum slopes of 1-2% are typically required for proper drainage in pipes and surfaces to ensure water flows away effectively.