Accessibility Calculators
Use our accessibility calculators to calculate ramp gradient, ramp angle and luminance contrast for accessible design, SDA and building compliance.
AS 1428.1 • NCC Accessibility • SDA & Building Compliance
| Accessibility Requirement | Required Contrast | Result |
|---|---|---|
| Minimum Contrast Requirement | 30% | - |
| Enhanced Contrast Requirement | 45% | - |
| High Contrast Requirement | 60% | - |
| Gradient | Typical Use |
|---|---|
| 1:20 | Preferred accessible path |
| 1:14 | Access ramps |
| 1:10 | Short step ramps only |
| 1:40 | Landings and crossfalls |
Accessibility Calculators Australia
These free accessibility calculators assist builders, architects, building surveyors, SDA assessors and homeowners to calculate ramp gradients, ramp angles and luminance contrast for accessible design and building compliance.
Ramp Gradient Calculator Australia
The Ramp Gradient Calculator calculates the gradient and angle based on ramp length and vertical height.
Luminance Contrast Calculator Australia
The Luminance Contrast Calculator helps assess the contrast between two surfaces using Light Reflectance Values, commonly referred to as LRV values.
Frequently Asked Questions
How is ramp gradient calculated?
Ramp gradient is calculated by dividing the ramp length by the vertical height. For example, 1400mm length and 100mm height equals a 1:14 gradient.
How is luminance contrast calculated?
Luminance contrast is calculated using the Light Reflectance Values of two surfaces. The higher LRV and lower LRV are compared to determine the percentage contrast.
Can these calculators be used for SDA projects?
Yes. These calculators can be used for SDA, NDIS, residential and accessibility projects.
