Contrast Ratio Calculator

Calculate contrast ratio for accessibility and design compliance.

Color Pickers

Foreground Text

Background

Preview

Headline Text

This is a sample paragraph to test readability. Accessibility in design ensures that everyone, including people with vision loss, can access your content.

WCAG Compliance

Contrast Ratio

4.85:1

AA Normal

Small text (<18pt) (Min 4.5:1)

AA Large

Bold/Large text (>18pt) (Min 3.0:1)

AAA Normal

Highest accessibility (Min 7.0:1)

AAA Large

Enhanced for large text (Min 4.5:1)

Good! This meets standard accessibility for most web content.

About this calculator

Overview

Contrast ratio measures luminance difference between text and background. WCAG accessibility guidelines require minimum 4.5:1 for normal text, 3:1 for large text. Essential for readable, accessible design.

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Pro Tips

The WCAG (Web Content Accessibility Guidelines) are the gold standard for web accessibility.
Level AA is the standard requirement for most websites.
Large text is defined as 18pt (roughly 24px) or larger, or 14pt (roughly 18.5px) and bold.
Avoid using color as the only way to convey meaning, as users with color blindness may not perceive the difference.

Fun Facts

Formula: Contrast = (L1 + 0.05) / (L2 + 0.05) where L = relative luminance