Color, Personally
A practical worksheet

Two-color contrast lab

Explore the digital light-dark separation between two sRGB colors. This is the WCAG contrast formula, not personal color analysis or a prediction of fabric appearance.

01 / Your inputs
02 / Working result

Start with your own inputs.

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Change the example inputs, then select calculate.

How the worksheet works

The calculation, made visible.

(lighter relative luminance + 0.05) ÷ (darker relative luminance + 0.05)

Explore the digital light-dark separation between two sRGB colors. This is the WCAG contrast formula, not personal color analysis or a prediction of fabric appearance.

The worksheet uses only the values on this page. It sends no entries to a server and does not keep them after you leave or reload. Your browser may offer its own autofill or page-saving features.

Read the context.