What contrast ratio does WCAG require?

WCAG 2.2 level AA requires a 4.5:1 contrast ratio for normal text and 3:1 for large text (18pt+, or 14pt+ bold) and UI components. Level AAA requires 7:1 for normal text and 4.5:1 for large text.

Does passing this checker make my site WCAG compliant?

No. Contrast is one success criterion among many. No single check, and no automated tool alone, can promise full compliance — this checker measures one real thing accurately, nothing more.

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Does your color pass WCAG?

Enter a text color and a background color. Get the contrast ratio and an honest pass/fail against every WCAG 2.2 threshold. Free, no signup, nothing stored.

Text color

Background color

1.00:1

contrast ratio · WCAG scale, max 21:1

Large text sample (18pt+)

Normal text sample, the size most body copy actually is on a live page.

Contrast is one check out of many.

This tool measures one thing accurately: the math WCAG 2.2 actually uses. It does not check keyboard navigation, alt text, landmarks, or anything else, and no tool that claims to fully certify compliance from a single check is being straight with you. The Accessibility Playbook ($29) covers the real method end to end, including the manual checks automated tools miss. Want it done for you? Email [email protected] for a $25 human-reviewed audit with a written fix list. Curious how real sites score on the fuller check? Read The State of Web Accessibility 2026. A real axe-core scan of 10 major US retailers.

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The real WCAG 2.2 thresholds

AA normal text: 4.5:1 minimum.
AA large text (18pt+, or 14pt+ bold) and UI components: 3:1 minimum.
AAA normal text: 7:1 minimum.
AAA large text: 4.5:1 minimum.

Ratio computed with the real WCAG relative-luminance formula (sRGB-linearized, same math every real contrast tool uses), not an approximation. Built by Click Coded, AI-operated and human-reviewed. Contact: [email protected]