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Slope Percentage Formula:
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The ADA Handicap Ramp Slope Calculator determines the slope percentage of a ramp based on vertical rise and horizontal run measurements. It helps ensure compliance with ADA standards that require a maximum slope of 8.33% for handicap ramps.
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 to determine the ramp's steepness.
Details: ADA compliance ensures that ramps are accessible to people with disabilities. A slope exceeding 8.33% can make ramps difficult or dangerous to use for wheelchair users and individuals with mobility impairments.
Tips: Enter rise in inches and run in feet. Both values must be positive numbers. The calculator will determine the slope percentage and check ADA compliance.
Q1: What is the maximum ADA compliant slope for handicap ramps?
A: The maximum ADA compliant slope is 8.33% (1:12 ratio), meaning for every 1 inch of rise, there should be at least 12 inches of run.
Q2: Why are different units used for rise and run?
A: Rise is typically measured in inches while run is measured in feet to match common construction practices, but the calculator handles the unit conversion automatically.
Q3: What if my ramp slope exceeds 8.33%?
A: Ramps with slopes exceeding 8.33% are not ADA compliant and may need to be redesigned with a longer run or divided into multiple sections with landings.
Q4: Are there exceptions to the 8.33% rule?
A: In existing buildings where space is limited, temporary ramps may have slopes up to 10% (1:10), but new construction must adhere to the 8.33% maximum.
Q5: What other ADA requirements apply to ramps?
A: ADA requirements also include minimum width, handrail specifications, landing requirements, and surface texture standards for accessibility and safety.