1. What is an Underground Parking Ramp Slope Calculator?

Definition: This calculator determines the slope percentage of underground parking ramps based on the vertical rise and horizontal run measurements.

Purpose: It helps architects, engineers, and construction professionals ensure parking ramp slopes meet safety standards and building codes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Rise — Vertical height change (feet)
• Run — Horizontal distance (feet)

Explanation: The ratio of rise to run is converted to a percentage to express the slope steepness.

3. Importance of Proper Ramp Slope

Details: The International Building Code (IBC) typically limits parking ramp slopes to 1:5 (20%) maximum for safety and vehicle accessibility.

4. Using the Calculator

Tips: Enter the vertical rise and horizontal run in feet. The calculator will show the slope percentage and validate against the 20% maximum.

5. Frequently Asked Questions (FAQ)

Q1: What's the maximum recommended slope for parking ramps?
A: 20% (1:5 ratio) is typically the maximum allowed by building codes for vehicle ramps.

Q2: How is slope different from angle?
A: Slope is a ratio (rise:run) expressed as percentage, while angle is measured in degrees from horizontal.

Q3: Why is there a maximum slope limit?
A: Steeper slopes can cause vehicle scraping, loss of traction, and safety hazards for pedestrians.

Q4: Are there different requirements for accessible routes?
A: Yes, ADA requires pedestrian accessible routes to have much gentler slopes (typically ≤8.33%).

Q5: How do I measure rise and run in the field?
A: Use a level and measuring tape - rise is vertical change, run is horizontal distance between points.