Ramp Gradient Ratio Calculator

Ramp Gradient Formulas:

\[ Ratio = \frac{Run}{Rise} \] \[ Percentage = \left( \frac{Rise}{Run} \right) \times 100\% \]

Ratio (Run:Rise):

Gradient Percentage:

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1. What is Ramp Gradient Ratio?

The ramp gradient ratio represents the relationship between the horizontal distance (run) and vertical height (rise) of a ramp. It is crucial for designing accessible ramps that comply with building codes and accessibility standards.

2. How Does the Calculator Work?

The calculator uses two fundamental formulas:

\[ Ratio = \frac{Run}{Rise} \] \[ Percentage = \left( \frac{Rise}{Run} \right) \times 100\% \]

Where:

\( Run \) — Horizontal distance of the ramp
\( Rise \) — Vertical height change of the ramp
\( Ratio \) — Run to Rise ratio (e.g., 12:1)
\( Percentage \) — Slope expressed as a percentage

Explanation: The ratio indicates how many units of run are needed for each unit of rise, while the percentage shows the steepness of the slope.

3. Importance of Ramp Gradient Calculation

Details: Proper ramp gradient is essential for wheelchair accessibility, safety, and compliance with ADA (Americans with Disabilities Act) and other accessibility standards. Steep ramps can be dangerous, while overly gentle ramps may be impractical.

4. Using the Calculator

Tips: Enter run and rise values in consistent units (both feet or both meters). Ensure values are positive, with run greater than zero. The calculator will compute both the ratio and percentage gradient.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum allowable ramp slope for accessibility?
A: ADA standards require a maximum slope of 1:12 (8.33%) for accessible routes. Some jurisdictions may have different requirements.

Q2: What does a 1:12 ratio mean?
A: A 1:12 ratio means for every 1 unit of rise, you need 12 units of run. This translates to approximately 8.33% slope.

Q3: When are landings required on ramps?
A: Landings are typically required every 30 feet of run, at the top and bottom of ramps, and where ramps change direction.

Q4: Can this calculator be used for vehicle ramps?
A: Yes, but vehicle ramps often have different slope requirements. Consult local building codes for specific vehicle ramp standards.

Q5: How do I convert between ratio and percentage?
A: Percentage = (Rise ÷ Run) × 100. Ratio = Run ÷ Rise. The calculator automatically performs both calculations.