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Slope Ratio Formula:
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Slope ratio in architecture represents the relationship between horizontal distance (run) and vertical distance (rise). It is commonly expressed as "run:rise" and is fundamental in designing ramps, roofs, drainage systems, and accessible pathways.
The calculator uses the slope ratio formula:
Where:
Additional Calculations: The calculator also provides slope percentage and angle in degrees for comprehensive analysis.
Details: Accurate slope calculation is crucial for ensuring building code compliance, accessibility standards, proper drainage, structural stability, and aesthetic design in architectural projects.
Tips: Enter run (horizontal distance) and rise (vertical distance) in consistent units. The calculator will provide slope ratio, percentage, and angle. All values must be positive numbers.
Q1: What is the standard slope ratio for wheelchair ramps?
A: ADA standards require a maximum slope of 1:12 (8.33%) for wheelchair ramps, meaning 1 unit vertical for every 12 units horizontal.
Q2: How does slope ratio differ from slope percentage?
A: Slope ratio is expressed as run:rise (e.g., 4:1), while slope percentage is (rise/run) × 100%. A 4:1 ratio equals 25% slope.
Q3: What are common slope ratios for roofing?
A: Roof slopes vary by material - typically 4:12 for asphalt shingles, 3:12 for metal roofing, and 2:12 for built-up roofs.
Q4: How is slope ratio used in drainage design?
A: Minimum slopes for drainage pipes are typically 1:40 to 1:100 depending on pipe size and application to ensure proper water flow.
Q5: Can I use different units for run and rise?
A: No, use consistent units (both in feet, both in meters, etc.) for accurate calculations. The calculator works with any consistent unit system.