Color Contrast Calculator
Calculate color contrast ratios to ensure accessibility and readability in designs.
Color Inputs
Preview
Sample Text Preview
Smaller text sample
Contrast Results
Contrast Ratio
WCAG 2.1 Compliance
Text Classification
About Color Contrast
Color contrast is crucial for accessibility. The Web Content Accessibility Guidelines (WCAG) 2.1 recommend minimum contrast ratios to ensure text is readable for users with visual impairments. Higher contrast ratios (7:1 or higher) provide better readability for all users.
About This Calculator
Check foreground/background contrast ratios and confirm readability against accessibility targets.
Formula
Contrast ratio = (L1 + 0.05) / (L2 + 0.05), where L1 >= L2.
Example
Test text color on brand backgrounds to verify WCAG-friendly combinations.
When to Use
- Web accessibility QA
- Design system reviews
- Brand palette validation
Best Practices
- Confirm every input uses the same measurement system your source uses.
- Stress-test edge cases (zero, very small, very large) before trusting a plan.
- If a number feeds a contract, note the formula version you relied on.
FAQ
What should I double-check first in Color Contrast Calculator?
Units, time periods, and whether the output matches the question you meant to ask.
Can I use this for regulated or compliance work?
Only if your inputs and definitions are confirmed against applicable standards. Results are informational.
Important Note
Results are informational and should be independently verified for legal, medical, engineering, or financial use.
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