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Slope Formula:
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Ramp slope is the ratio of vertical rise to horizontal run, typically expressed as a ratio (e.g., 1:12) or percentage. It's a critical measurement for ensuring accessibility compliance for wheelchair ramps and other mobility aids.
The calculator uses the slope formula:
Where:
Explanation: The calculator converts the slope to multiple formats including ratio (1:X), percentage, and angle in degrees for comprehensive understanding.
Details: According to the Americans with Disabilities Act (ADA), the maximum slope for wheelchair ramps is 1:12 (8.33%). This means for every 1 unit of vertical rise, there must be at least 12 units of horizontal run.
Tips: Enter the vertical rise and horizontal run using consistent units (both in meters, both in feet, etc.). The calculator will provide slope in ratio, percentage, and angle formats.
Q1: What is the maximum allowable slope for ADA compliance?
A: The maximum slope for ADA-compliant ramps is 1:12 (8.33% slope).
Q2: How do I measure rise and run accurately?
A: Measure the vertical height difference from start to finish (rise) and the horizontal distance covered (run). Use the same units for both measurements.
Q3: What if my calculated slope exceeds ADA requirements?
A: If your slope exceeds 1:12, the ramp may not be ADA compliant and could be difficult or unsafe for wheelchair users. Consider extending the run or reducing the rise.
Q4: Are there different requirements for existing buildings?
A: While new construction must meet the 1:12 standard, some existing structures may have grandfather clauses, though accessibility improvements are encouraged.
Q5: Does this calculator work for any ramp configuration?
A: This calculator works for straight ramps. Curved or switchback ramps require more complex calculations that account for changes in direction.