Color Contrast Checker
Enter RGB values for foreground and background colors to determine their contrast ratio.
For basic accessibility checks; verify with full WCAG guidelines for compliance.
Examples
- Black (0,0,0) vs White (255,255,255) ⇒ 21.00:1
- #123456 vs #ABCDEF ⇒ 7.70:1
FAQ
What ratio meets WCAG AA for normal text?
A contrast ratio of at least 4.5:1 is recommended.
Do I enter hexadecimal colors?
Convert hex values to RGB numbers before using the calculator.
Why is contrast important?
Adequate contrast improves readability and accessibility for all users.
Additional Information
- Contrast ratios range from 1:1 (no contrast) to 21:1 (maximum).
- Uses relative luminance as defined by WCAG 2.1.