LRV Visual Contrast Calculator

DEVELOPMENT TESTINGĀ PAGE

What is LRV - click to find out more
Enter LRVĀ Values
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Important Compliance & Liability Disclaimer
This software is provided for guidance and preliminary planning purposes only. The Light Reflectance Values (LRVs) used in this tool are sourced from third-party manufacturers; we cannot guarantee the accuracy of external data or consistency across different production batches.
While this tool applies the calculation logic set out in Approved Document M (Volume 2) and BS 8300-2:2018, it does not constitute a formal compliance certification, legal advice, or a guarantee of Building Control approval. Real-world visual contrast is heavily influenced by lighting design, material texture, and maintenance, which cannot be fully replicated digitally.
User Responsibility: You are responsible for verifying all specifications against physical samples and seeking approval from a relevant Building Control Body or Access Consultant. The providers of this tool accept no liability for any loss, damage, or compliance failure resulting from the use of, or reliance on, this data.

Common Questions:
Approved Document M & Visual Contrast

There is a common misconception that 'visual contrast' is a generic term and can be achieved through the use of bold colours.

To comply with UK regulations, a mathmatical calculation must be completed to achieve appropriate contrast levels between specific surfaces.

The tool below makes this easy- and enables clever solutions that are attractive as well as compliant.

Click here for more information on LRV and Visual Contrast.

What is LRV?

LRV- 'Light Reflectance Value'
LRV is a measurement of the quantity of light reflected from a surface, expressed as a percentage from 0-100%

When does LRV need to be considered?

WIthin the UK, LRV values must be calculated to ensure compliance with buildings regulations.
For further information please see Approved Documents M, K &Ā T and BS 8300-2:2018.

Do IĀ need to use bold colours to achieve 'visual contrast'?

Not necessarily, visual contrast is achieved by having appropriate LRV contrast levels, which is different from hue (colour). Whilst many designers do use vivid colours, this can result in a scheme looking institutional or eroding the design intent.
It is entirely possible to achieve a scheme which is both attractive and compliant.

Why is LRV important?

This is an often overlooked area of accessible design. Having appropriate visual contrast enables a variety of users to independently navigate a space.
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Users who benefit from an LRVĀ compliant interior include:
- The visually impaired
- The elderly
- People with Dementia, or other cognitive impairments
- People with neurodiversities
- Anyone, in a low light or emergency situation

Welcome to Spira's LRV & Visual Contrast Calculator

We’re pleased to have you here. While you can explore on mobile, this technical tool is fully optimised for desktop use.

We look forward to seeing you back at your workstation!

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