🎨 Contrast Ratio Calculator
Check if your color combinations meet WCAG accessibility standards.
✅ Formula verified against standard references
•
Last Updated: Jan 2026
Contrast Ratio
21:1
Sample Text Preview
AA Normal
Pass (≥4.5:1)
Pass (≥4.5:1)
AAA Normal
Pass (≥7:1)
Pass (≥7:1)
AA Large
Pass (≥3:1)
Pass (≥3:1)
AAA Large
Pass (≥4.5:1)
Pass (≥4.5:1)
💡 Expert Tip
Don't rely on color alone. 8% of men are colorblind. If your error message is "red text" with no icon or label, colorblind users won't see the warning. Always pair color with text, icons, or underlines.
Formula verified against standard references