Home
Back
Ramp Ratio Formula:
| From: | To: |
Ramp ratio represents the slope of a ramp expressed as the relationship between horizontal length (run) and vertical height (rise). It is commonly used in construction, accessibility design, and engineering to determine the steepness of inclined surfaces.
The calculator uses the ramp ratio formula:
Where:
Explanation: The ratio indicates how many units of horizontal length are required for each unit of vertical height. For example, a ratio of 12:1 means 12 feet of length for every 1 foot of height.
Details: Proper ramp ratio calculation is essential for ensuring accessibility compliance, safety standards, and functional design in construction projects. It helps determine if a ramp meets building code requirements for wheelchair access and general usability.
Tips: Enter the horizontal length and vertical height in feet. Both values must be positive numbers greater than zero. The calculator will provide the ramp ratio in the format "X : 1".
Q1: What is the standard ramp ratio for accessibility?
A: For wheelchair ramps, the Americans with Disabilities Act (ADA) requires a maximum slope of 1:12, meaning 1 foot of rise for every 12 feet of run.
Q2: How does ramp ratio relate to slope percentage?
A: Slope percentage = (Rise ÷ Run) × 100. A 1:12 ratio equals approximately 8.33% slope.
Q3: What are common ramp ratios for different applications?
A: Residential ramps: 1:12, Commercial ramps: 1:12 to 1:20, Vehicle ramps: 1:4 to 1:6, depending on the vehicle type.
Q4: When is a ramp considered too steep?
A: A ramp steeper than 1:8 (12.5% slope) is generally difficult for manual wheelchair users. Steeper than 1:4 (25% slope) requires assistance.
Q5: Are there exceptions to standard ramp ratios?
A: Yes, temporary ramps or those for specific purposes may have different ratios, but permanent accessible ramps should follow local building codes and ADA guidelines.