1. What is Wheelchair Ramp Slope?

The wheelchair ramp slope is the ratio of vertical rise to horizontal run, expressed as a unitless ratio (e.g., 1:12). In New Zealand, the maximum allowable slope for accessibility is 1:12, meaning for every 12mm of horizontal length, the ramp can rise 1mm.

2. How Does the Calculator Work?

The calculator uses the slope formula:

Where:

• \( Rise \) — Vertical height in millimeters (mm)
• \( Run \) — Horizontal length in millimeters (mm)
• \( Slope \) — Expressed as a ratio (e.g., 1:12)

Explanation: The calculator converts the decimal slope to a ratio format and checks compliance with New Zealand's maximum 1:12 standard for wheelchair accessibility.

3. Importance of Slope Calculation

Details: Proper slope calculation ensures wheelchair ramps are safe and accessible. Steeper slopes make it difficult for wheelchair users to navigate independently and can be hazardous.

4. Using the Calculator

Tips: Enter the vertical rise and horizontal run in millimeters. Both values must be positive numbers. The calculator will display the slope ratio and indicate whether it meets NZ standards.

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum slope allowed in New Zealand?
A: The maximum slope for wheelchair ramps in NZ is 1:12 (8.33% gradient) for public accessibility.

Q2: Are there different requirements for different ramp types?
A: Yes, shorter ramps (under 1900mm) may allow 1:8 slope, but 1:12 is recommended for general accessibility.

Q3: What about landings and handrails?
A: Ramps longer than 9000mm require intermediate landings, and handrails are required on both sides for ramps steeper than 1:20.

Q4: How do I convert slope ratio to percentage?
A: Multiply the ratio by 100. For example, 1:12 = (1/12)×100 = 8.33% gradient.

Q5: What if my slope is steeper than 1:12?
A: You may need to lengthen the ramp, consider switchbacks, or explore alternative accessibility solutions like platform lifts.