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ADA Ramp Formula:
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The ADA (Americans with Disabilities Act) ramp calculation determines the minimum length required for a ramp based on the vertical rise. The standard requires a slope of 1:12, meaning for every 1 inch of vertical rise, 12 inches of ramp length are needed.
The calculator uses the ADA formula:
Where:
Explanation: This formula ensures compliance with ADA accessibility standards by maintaining the required 1:12 slope ratio for wheelchair ramps.
Details: ADA compliant ramps are essential for providing accessible routes for people with mobility impairments. Proper ramp design ensures safe and independent access to buildings and facilities.
Tips: Enter the vertical rise in feet. The calculator will determine the minimum ramp length required to meet ADA standards. All values must be valid (rise > 0).
Q1: Are there exceptions to the 1:12 slope requirement?
A: For existing buildings where space is limited, a steeper slope of 1:10 or 1:8 may be allowed for short rises, but 1:12 is the preferred standard for new construction.
Q2: What about landings and handrails?
A: ADA requirements also include specifications for landings (every 30 feet and at top/bottom) and handrails (on both sides for ramps with rise greater than 6 inches).
Q3: Does this calculation work for metric measurements?
A: The formula works with any consistent units. For metric, use meters for both rise and length, keeping the 1:12 ratio (Length = Rise × 12).
Q4: What's the maximum rise for a single ramp run?
A: ADA standards limit a single ramp run to a maximum 30-inch rise before requiring a landing.
Q5: Are there different requirements for exterior vs interior ramps?
A: The 1:12 slope requirement applies to both, but exterior ramps may have additional considerations for weather resistance and drainage.