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
- Validate units and assumptions before interpreting output.
- Compare at least two scenarios to avoid single-point bias.
- Use results as decision support, then cross-check critical outcomes.
FAQ
Can I rely on Color Contrast Calculator for important decisions?
Use it as a fast and consistent estimator, then verify inputs and assumptions for high-stakes decisions.
Why might my result differ from another tool?
Different tools may use different rounding rules, defaults, or formula variants. Align assumptions before comparing.
Important Note
Results are informational and should be independently verified for legal, medical, engineering, or financial use.
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