Is this Contrast Ratio Calculator free to use?

Yes, Contrast Ratio Calculator is 100% free to use online with no installation or account required.

How do I use the Contrast Ratio Calculator?

Simply enter your values into the required input fields and click calculate to view the results instantly.

Can I use Contrast Ratio Calculator on mobile devices?

Yes, the calculator is fully responsive and compatible with Android, iOS, Windows, macOS, and Linux web browsers.

Contrast Ratio Calculator — Free Online Tool

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Contrast Ratio Calculator

Calculate WCAG contrast ratio and accessibility compliance

Formula: $\text{Contrast Ratio} = \frac{L_1 + 0.05}{L_2 + 0.05}$ (where $L_1$ is the relative luminance of the lighter color and $L_2$ is of the darker color). Enter text and background colors below.

Color Selection

Text Color (Hex)

Background Color (Hex)

Calculation Results

⚠️ For educational and web accessibility design reference purposes only.

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Contrast Ratio Calculator

Calculation Results

Why Choose Our Calculator Platform?

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