Colour Tools
Free Colour Services
architects & designers
Luminance contrast calculator
Enter the Light Reflectance Values (LRV) for two colours. We calculate contrast using the Bowman-Sapolinski method.
LRV is a value from 0 (dark) to 100 (light). Decimals are allowed.
This tool is a guide only. For regulated projects, confirm requirements with your specifier or relevant standards.
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