1. What is a Ramp Ratio Calculator for Australia?

Definition: This calculator determines the ratio of a ramp's length to its height, specifically designed to meet Australian standards (AS 1428.1).

Purpose: It helps architects, builders, and accessibility consultants ensure ramps comply with Australian accessibility requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Ramp ratio (unitless)
• \( L \) — Length of ramp (meters)
• \( H \) — Height of ramp (meters)

Explanation: The ratio compares the horizontal distance traveled to the vertical rise, with Australian standards typically requiring 1:14 for accessible ramps.

3. Importance of Ramp Ratio Calculation

Details: Proper ramp ratios ensure accessibility for wheelchair users and compliance with Australian building codes (AS 1428.1 - Design for access and mobility).

4. Using the Calculator

Tips: Enter the ramp length and height in meters. The calculator will determine if the ratio meets Australian standards (1:14 is the maximum slope for accessible routes).

5. Frequently Asked Questions (FAQ)

Q1: What is the standard ramp ratio in Australia?
A: The maximum slope for an accessible ramp is 1:14 (1 unit vertical to 14 units horizontal) according to AS 1428.1.

Q2: When can I use a steeper ratio?
A: Steeper ratios (up to 1:8) may be allowed for short ramps (≤ 1520mm) in existing buildings where space is limited.

Q3: Does this include landing requirements?
A: No, this calculator only determines the slope ratio. Australian standards also require landings at least every 9 meters of ramp length.

Q4: How does this differ from gradient percentage?
A: Ratio (1:14) is the inverse of gradient percentage (7.1%). Multiply ratio by 100 to get percentage.

Q5: What about handrail requirements?
A: All ramps in Australia require handrails on both sides when the rise is greater than 300mm or the length exceeds 1900mm.