Color contrast ratio online calculator

Swap colors
WCAG requirements:Font sizeAA-levelAAA-levelSmall text (<18pt)PASSFAILPASSFAILLarge text (>= 18pt)PASSFAILPASSFAIL16px:
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.
Liked our calculator? Share it
Embed calculator to your site

Try our color contrast calculator

Are you looking for an online color contrast ratio calculator to ensure your website meets accessibility standards? Look no further! Our online color contrast ratio calculator is the perfect tool to help you create a more inclusive and user-friendly website. In this SEO-optimized text, we will explore the benefits of using our color contrast ratio calculator and how it can improve your website's accessibility.

Web accessibility is a crucial aspect of designing inclusive and user-friendly websites. It ensures that people with visual impairments or color deficiencies can access and comprehend the content effectively. One important factor in web accessibility is contrast and color. Understanding the concept of contrast ratio and using the right colors can significantly improve the readability and usability of a website.

Contrast and Color Use

Contrast ratio is a technique used to measure the difference in luminance between two colors. It helps determine the legibility of text and other visual elements on a webpage. The contrast ratio is calculated by comparing the relative luminance values of the foreground and background colors.

According to the WCAG 2.1 (Web Content Accessibility Guidelines) success criteria, there are specific requirements for contrast to ensure readability. The minimum contrast ratio is defined by WCAG, and meeting these requirements is essential for creating an accessible website.

Minimum Contrast Ratio

The minimum contrast ratio recommended by WCAG is 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold). This ensures that the text is distinguishable from the background for individuals with low vision or color deficiencies. By adhering to these guidelines, web designers can improve the accessibility of their websites.

Tools to Modify Colors

Our helpful tool for designers is the Contrast Ratio calculator. This online tool allows you to modify the background and font colors to determine the contrast ratio between them. By adjusting the color combinations, you can identify the optimal contrast ratio that meets accessibility guidelines. The Contrast Ratio calculator simplifies the process of creating a more inclusive and accessible website.

Using the Contrast Ratio calculator is straightforward. You can input the hexadecimal values or use the color picker to select the desired colors. The calculator then provides the contrast ratio between the background and text colors. It also indicates whether the combination meets the WCAG requirements. This tool enables designers to experiment with different color combinations until they find the most accessible and visually pleasing options.

Content Marketing and Design

When it comes to web accessibility, content marketing and design play vital roles. SEO content strategy focuses on optimizing website content to improve its visibility in search engine results. By incorporating accessible design principles, content marketers can reach a wider audience, including people with visual impairments or color deficiencies.

SEO Content Strategy

SEO content strategy involves the use of keywords, metadata, and other optimization techniques to enhance a website's search engine ranking. By integrating accessibility considerations, content marketers can attract more organic traffic from individuals who rely on assistive technologies. Furthermore, accessible content enhances the user experience for all visitors, leading to higher engagement and conversion rates.

Content Marketing Agencies

Content marketing agencies have a crucial role in promoting web accessibility. They can educate their clients about the importance of creating inclusive digital experiences and guide them in implementing accessibility best practices. By integrating accessibility into their content marketing strategies, agencies can contribute to a more accessible online environment.

Blog Design Best Practices

Blog design is another aspect of web accessibility. By following best practices, such as using appropriate color combinations and clear typography, blog designers can ensure that their content is readable and comprehensible for all users. Implementing features like resizable text, high contrast options, and alternative text for images can significantly improve the accessibility of blog posts.


Web accessibility is a fundamental consideration for designers and content marketers. Contrast ratio and color choice are essential components in creating accessible websites. By using tools like the Contrast Ratio calculator and following WCAG guidelines, designers can ensure that their websites are inclusive and user-friendly for individuals with visual impairments or color deficiencies. Incorporating web accessibility into content marketing strategies and adhering to design best practices enhances the overall user experience and expands the reach of online content.

Privacy Policy

We do not send or store the entered data or results anywhere. We use analytics systems to collect statistics of site visits.

Calculation history is stored exclusively in the user's browser and can be deleted by clearing our site data or by using the clear history button.

Contact us

If you have any questions or wishes - send them to the mail.