Calculatorism

Relative Luminance Calculator

Compute WCAG relative luminance L = 0.2126R + 0.7152G + 0.0722B (linearized).

Input Data

Input Red R.
Input Green G.
Input Blue B.

Results

1
WCAG relative luminance (0–1).

At a glance:Relative Luminance Calculator: enter parameters to compute results; complements related calculators.

Formula

Linearize c' = c/12.92 (c≤0.04045) else ((c+0.055)/1.055)^2.4.

L = 0.2126R' + 0.7152G' + 0.0722B'.

How to Use

  1. Enter R,G,B (0–255).
  2. It returns relative luminance (0–1).

Case Studies

White (255,255,255) → L=1

All channels linearize to 1, L=1.

FAQ

Why linearize?

sRGB is gamma-encoded; luminance needs linear light before weighting.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Relative Luminance Calculator（/color/relative-luminance）。