1. What is Slope Ratio?

Slope ratio represents the steepness or incline of a surface, expressed as the ratio of vertical change (rise) to horizontal change (run). It's a fundamental measurement in construction for designing roofs, ramps, roads, and drainage systems.

2. How Does the Calculator Work?

The calculator uses the slope ratio formula:

Where:

• \( rise \) — Vertical change (in consistent units)
• \( run \) — Horizontal change (in consistent units)

Additional Calculations:

• Slope Percentage = (rise/run) × 100
• Angle in Degrees = arctan(rise/run)

3. Importance of Slope Calculation in Construction

Details: Accurate slope calculation is essential for proper drainage, accessibility compliance, structural integrity, and meeting building code requirements. It ensures water flows away from structures and creates safe, functional surfaces.

4. Using the Calculator

Tips: Enter both rise and run values in the same units (meters, feet, etc.). Both values must be positive numbers greater than zero. The calculator will provide slope ratio, percentage, and angle.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between slope ratio and slope percentage?
A: Slope ratio is expressed as a proportion (e.g., 1:4), while slope percentage is the ratio multiplied by 100 (e.g., 25%).

Q2: What is a typical roof slope ratio?
A: Residential roofs typically range from 4:12 to 12:12 slope ratios, depending on climate and roofing material requirements.

Q3: What's the maximum slope for wheelchair accessibility?
A: ADA guidelines typically require a maximum slope of 1:12 (8.33%) for ramps.

Q4: How do I measure rise and run in the field?
A: Use a level and measuring tape. Place the level horizontally, measure the vertical distance from one end to the ground (rise), and measure the horizontal distance (run).

Q5: Can I use different units for rise and run?
A: No, both measurements must use the same units for the calculation to be accurate.