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Validate text/background contrast against WCAG AA and AAA thresholds. This tool helps designers and developers select accessible color combinations with clear pass/fail feedback.
Last updated: April 15, 2026
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Contrast Ratio
18.88:1
WCAG AA
Pass
WCAG AAA
Pass
Excellent contrast. This pair meets WCAG AAA guidance for the selected text context.
Live preview of selected color combination for quick visual validation.
We can build and embed a custom version of Color Contrast WCAG AAA Calculator for your brand and workflow.
Calculates ratio from relative luminance values using WCAG-defined methodology.
Checks compliance against AA and AAA levels based on normal or large text context.
Provides practical guidance when a color pair fails target accessibility levels.
Text color `#111111` on background `#FFFFFF` typically yields strong contrast and passes both AA and AAA for normal text contexts.
Contrast Ratio
~18.88:1
WCAG AA
Pass
WCAG AAA
Pass
This calculator uses WCAG luminance formulas to compute contrast ratio, then compares results to AA and AAA thresholds based on text size context.
Inputs: Text color + background color + text-size contextOutput: Contrast ratio with AA/AAA pass-fail statusStandard: WCAG contrast thresholds for accessible text readabilityPair contrast validation with font-size and zoom-readability checks for stronger accessibility outcomes.
Explore Accessibility & Ergonomics CalculatorsResult: Near-threshold pairs may pass AA while missing AAA, requiring stronger contrast adjustments.
Small tone shifts can significantly improve accessibility compliance.
Share it with designers and developers building more accessible visual systems.
Suggested hashtags: #Accessibility #WCAG #DesignSystem #ContrastRatio #InclusiveDesign