1. What is DDA Ramp Gradient?

The DDA (Disability Discrimination Act) ramp gradient refers to the maximum allowable slope for accessible ramps to ensure they can be safely used by people with disabilities, particularly those using wheelchairs or mobility aids.

2. How Does the Calculator Work?

The calculator uses the gradient formula:

Where:

• \( Rise \) — Vertical height difference (meters)
• \( Length \) — Horizontal length of the ramp (meters)

Explanation: The gradient is calculated as the ratio of vertical rise to horizontal length, with maximum DDA-compliant gradient being 1:12 (approximately 8.33%).

3. Importance of DDA Compliance

Details: DDA-compliant ramps ensure accessibility for all users, including wheelchair users, people with mobility impairments, and those using walking aids. Non-compliant ramps can pose safety hazards and limit accessibility.

4. Using the Calculator

Tips: Enter the vertical rise and horizontal length in meters. The calculator will determine the gradient ratio, percentage, and whether it meets DDA compliance standards (max 1:12 gradient).

5. Frequently Asked Questions (FAQ)

Q1: What is the maximum DDA-compliant gradient?
A: The maximum allowable gradient for DDA-compliant ramps is 1:12, which equals approximately 8.33% slope.

Q2: Why is 1:12 the maximum gradient?
A: This gradient ensures that wheelchair users can safely ascend and descend ramps without excessive effort or risk of tipping backwards.

Q3: Are there exceptions to the 1:12 rule?
A: In some cases with limited space, steeper gradients may be permitted for very short ramps, but 1:12 is the standard for general accessibility.

Q4: What other factors affect ramp accessibility?
A: Landing platforms, handrails, surface texture, width, and edge protection are also important considerations for accessible ramp design.

Q5: How is gradient different from slope?
A: Gradient is typically expressed as a ratio (1:12) while slope is expressed as a percentage. They represent the same relationship but in different formats.