LRV Calculator
What is LRV (Light Reflectance Value)?
Light Reflectance Value (LRV) measures how much visible light a surface reflects on a scale from 0 to 100.
- 0 = absorbs all light (black)
- 100 = reflects all light (white)
In simple terms, LRV tells you how light or dark a surface appears.
Why LRV matters
LRV is widely used in building design to improve visibility, accessibility, and safety.
- Helps people clearly distinguish between surfaces
- Critical for visually impaired users navigating spaces
- Improves overall wayfinding and safety in low-light conditions
LRV and stair safety
On stairs, visibility is essential. Poor contrast makes it harder to see step edges, increasing the risk of trips and falls.
- Stair nosings should clearly contrast with the step
- This contrast is measured using LRV difference
Recommended contrast
As indicated by AS1428.1 – 30% contrast is required, and is Tredsafe’s recommendation for adequate contrast.