1. What is Ramp Ratio?

Ramp ratio, also known as slope ratio, is a dimensionless value that represents the steepness of a ramp. It is calculated as the vertical rise divided by the horizontal run and is commonly used in construction, engineering, and accessibility design.

2. How Does the Calculator Work?

The calculator uses the ramp ratio formula:

Where:

• \( Rise \) — Vertical height difference (units)
• \( Run \) — Horizontal distance (units)
• \( Ratio \) — Dimensionless slope value

Explanation: The ratio indicates how much vertical rise occurs per unit of horizontal run. A higher ratio means a steeper ramp.

3. Importance of Ramp Ratio Calculation

Details: Accurate ramp ratio calculation is crucial for ensuring accessibility compliance, structural safety, and proper drainage in construction projects. It helps determine if ramps meet ADA requirements and building codes.

4. Using the Calculator

Tips: Enter rise and run values in the same units (feet, meters, etc.). Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum ramp ratio for accessibility?
A: For wheelchair accessibility, the maximum slope ratio is typically 1:12 (rise:run), which equals approximately 0.0833.

Q2: How do I convert ratio to percentage or degrees?
A: Ratio to percentage: multiply by 100%. Ratio to degrees: use arctan(ratio). For example, 1:12 ratio = 8.33% slope = 4.76 degrees.

Q3: What are common ramp ratios in construction?
A: Common ratios include 1:12 for accessibility, 1:8 for moderate slopes, and 1:4 for steep ramps (varies by local building codes).

Q4: Why is ramp ratio important in drainage?
A: Proper slope ratios ensure water flows away from structures. Minimum ratios of 1:50 to 1:100 are often required for effective drainage.

Q5: Can this calculator be used for roof slopes?
A: Yes, the same ratio calculation applies to roof slopes, road grades, and any inclined surface measurement.