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Slope Ratio Formula:
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Slope ratio represents the steepness of a ramp, calculated as the ratio of vertical rise to horizontal run. In Australia, this measurement is particularly important for accessibility compliance and construction standards.
The calculator uses the slope ratio formula:
Where:
Explanation: The calculator automatically converts meters to millimeters to maintain consistent units, then calculates the ratio which is typically expressed as 1:X (e.g., 1:12).
Details: Accurate slope ratio calculation is crucial for designing accessible ramps that comply with Australian standards (AS 1428.1). Proper slope ratios ensure safety and accessibility for wheelchair users and people with mobility impairments.
Tips: Enter the vertical rise in millimeters and horizontal run in meters. Both values must be positive numbers. The calculator will automatically compute the slope ratio and display it in the standard 1:X format.
Q1: What is the maximum slope ratio allowed for accessible ramps in Australia?
A: According to Australian standards, the maximum slope for accessible ramps is 1:14 for ramps up to 9m in length, and 1:20 for longer ramps.
Q2: How do I convert slope ratio to degrees or percentage?
A: To convert to degrees: angle = arctan(rise/run). To convert to percentage: slope percentage = (rise/run) × 100.
Q3: Why are different units used for rise and run?
A: In construction, rise is typically measured in millimeters while run is measured in meters, following Australian building measurement conventions.
Q4: Does this calculator account for landings and handrails?
A: No, this calculator only computes the basic slope ratio. Full ramp design must consider additional requirements including landings, handrails, and edge protection as per Australian standards.
Q5: Can I use this calculator for other slope calculations?
A: Yes, this calculator can be used for any slope ratio calculation, though the output format is optimized for ramp design applications.