1. What is Slope Calculation?

Slope calculation determines the steepness or incline of a surface, expressed as a ratio, percentage, or angle. It's calculated by dividing the vertical rise by the horizontal run.

2. How Does the Calculator Work?

The calculator uses the slope formula:

Where:

• \( Rise_{ft} \) — Vertical rise in feet
• \( Rise_{in} \) — Additional vertical rise in inches
• \( Run_{ft} \) — Horizontal run in feet
• \( Run_{in} \) — Additional horizontal run in inches

Explanation: The calculator converts all measurements to decimal feet before calculating the slope ratio, percentage, and angle.

3. Importance of Slope Calculation

Details: Slope calculation is essential in construction, landscaping, road design, roofing, and accessibility planning. It helps ensure proper drainage, structural stability, and compliance with building codes.

4. Using the Calculator

Tips: Enter rise and run measurements in feet and inches. The run must be greater than zero. Results are provided as a ratio (e.g., 1:4), percentage, and angle in degrees.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical slope for a wheelchair ramp?
A: ADA guidelines recommend a maximum slope of 1:12 (8.33% or about 4.76 degrees) for wheelchair ramps.

Q2: How steep is a 45-degree slope?
A: A 45-degree slope has a ratio of 1:1 (100% grade), meaning it rises 1 unit for every 1 unit of run.

Q3: What's the difference between slope ratio and percentage?
A: Slope ratio expresses the relationship as rise:run (e.g., 1:4), while percentage expresses rise as a percentage of run (e.g., 25%).

Q4: How do I measure slope in the field?
A: Use a level and tape measure to determine vertical rise over a known horizontal distance, or use a digital inclinometer for direct measurement.

Q5: What is considered a steep slope?
A: Generally, slopes greater than 15% (about 8.5 degrees) are considered steep, but this varies by context and application.