Use our free Contrast Ratio Calculator to check if your color combinations meet WCAG 2.1 accessibility guidelines. Perfect for web designers, developers, and content creators to ensure optimal readability and user experience.
Formula:
The contrast ratio (CR) quantifies the difference in luminance between two colors, crucial for text readability. It's calculated using the relative luminance of the lighter color (L1) and the darker color (L2).
CR = (L1 + 0.05) / (L2 + 0.05)
Where:
- L1: Represents the relative luminance of the lighter of the two colors (a value between 0.0 and 1.0).
- L2: Represents the relative luminance of the darker of the two colors (a value between 0.0 and 1.0).
Our calculator automatically converts your input Hex color codes into their respective relative luminance values to provide an accurate contrast ratio, helping you achieve WCAG compliance.