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Slope Percentage Formula:
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Slope percentage is a measure of the steepness or incline of a surface, expressed as a percentage. It represents the vertical rise per 100 units of horizontal run and is commonly used in construction, landscaping, and engineering projects.
The calculator uses the slope percentage formula:
Where:
Explanation: The formula calculates the ratio of vertical rise to horizontal run and converts it to a percentage by multiplying by 100.
Details: Accurate slope calculation is essential for proper drainage, road construction, ramp design, roof pitching, and ensuring compliance with building codes and accessibility standards.
Tips: Enter both rise and run values in inches. Ensure measurements are accurate and taken perpendicular to each other. Both values must be positive numbers greater than zero.
Q1: What is a typical slope percentage for drainage?
A: For proper drainage, a minimum slope of 2% (1/4 inch per foot) is typically recommended for surfaces like patios and walkways.
Q2: How does slope percentage relate to degrees?
A: Slope percentage can be converted to degrees using the formula: degrees = arctan(slope percentage/100). A 100% slope equals 45 degrees.
Q3: What is the maximum slope for wheelchair ramps?
A: ADA guidelines recommend a maximum slope of 8.33% (1:12 ratio) for wheelchair ramps, though 5% is preferred for easier access.
Q4: Can I use different units with this calculator?
A: This calculator is specifically designed for inches. For other units, convert all measurements to inches first or use a calculator designed for those specific units.
Q5: What does a negative slope percentage indicate?
A: Negative slope percentage typically indicates a downward slope or decline rather than an incline. This calculator only handles positive values for simplicity.