Flesch Reading Ease: Does it help with SEO?

The Flesch Reading Ease score is a numerical value that indicates the readability of a text. This score helps determine how easily a text can be understood by a wide audience. Scores are calculated based on sentence length and word complexity, with higher scores indicating easier reading material. In the context of digital content, this score plays a crucial role in optimizing texts for a better user experience.

The development of the Flesch Reading Ease

Developed in the 1940s by Rudolf Flesch, an Austrian-American psychologist, the Flesch Reading Ease score was originally intended to improve the readability of English texts.

Flesch introduced a formula that takes into account the average sentence length and the average number of syllables per word, generating a numerical score representing readability. Since then, this formula has been adapted for different languages and has become a standard tool for writers, educators and SEO specialists.

The importance of readability for SEO

Readability is vital for search engine optimization (SEO) because it directly affects the user experience. Texts that are easy to read and understand hold the reader’s attention longer, leading to a lower bounce rate and higher time on page. Search engines such as Google use user interaction signals as indicators of content quality, which affects search engine ranking. Improving the readability of content increases the chances of higher rankings, more organic traffic and ultimately a better conversion rate.

The relationship between readability scores and search engine ranking

Although search engines such as Google do not explicitly confirm that readability scores are a direct ranking factor, numerous studies and analyses show that there is a significant correlation between readable content and higher rankings in search results. Search engines strive to provide users with relevant, accessible and valuable information. Texts with a high Flesch Reading Ease score often meet these criteria by presenting complex information in a simple and understandable way. Therefore, optimizing content for readability is an essential part of SEO strategies aimed at improving the visibility and reach of online content.

Calculation of the Flesch Reading Ease score.

The Flesch Reading Ease score provides a quantitative measure of a text’s readability. This score ranges between 1 and 100, with a higher score indicating greater readability. The formula to calculate this score takes into account two important elements: the length of sentences and the complexity of words.

The formula explained

The formula for calculating the Flesch Reading Ease score is as follows:

Score=206.835-(1.015×average sentence length)-(84.6×average number of syllables per word)Score=206.835-(1.015×average sentence length)-(84.6×average number of syllables per word)

Here, the average sentence length is the total number of words divided by the number of sentences, and the average number of syllables per word is calculated by dividing the total number of syllables by the total number of words.

Factors affecting the score

Two primary factors influence the Flesch Reading Ease score: the length of sentences and the use of complex words (measured in syllables). Longer sentences and words with more syllables lower the score, indicating lower readability. In contrast, shorter sentences and simpler words increase the score, indicating a text that is easier to understand.

Optimization of content for better readability

Optimizing content for better readability is all about deliberately adjusting the writing style to improve the accessibility and comprehensibility of the text.(1) This not only has a positive impact on the reader, but also enhances the SEO performance of the content.

Practical tips for improving readability

To improve the readability of texts, one can use the following strategies:

  • Use shorter sentences: This makes the text more accessible and easier to follow.
  • Avoid complex words: Whenever possible, choose simpler alternatives that are widely understood.
  • Vary sentence structure: This keeps the reader’s attention and improves the overall reading experience.
  • Use active rather than passive form: Active sentences are often shorter and clearer.

The importance of short sentences and paragraphs

Short sentences and paragraphs greatly increase readability. They make the text more visually appealing and provide points of rest for the reader. This improves not only comprehensibility but also engagement with the text.

The use of everyday words

The use of everyday words plays a crucial role in making content accessible. Avoiding jargon and complex terminology, or explaining them when their use is unavoidable, makes the text understandable to a wider audience. This contributes to a higher Flesch Reading Ease score and improves the user experience.

Tools and software for measuring readability

In the digital age, there are several tools and software available that can analyze the readability of texts. These tools offer writers and editors valuable insights into how their content performs in terms of accessibility and comprehensibility for its intended audience.

Overview of available resources

A range of tools is available to measure text readability:

  • Hemingway App: This application highlights sentences that are difficult to read, uses passive voice, and provides suggestions for easier alternatives.
  • Grammarly: In addition to grammar and spelling checks, Grammarly offers feedback on the readability of texts.
  • Readability Test Tools: Websites such as WebFX’s Readability Test Tool provide instant analysis of content readability scores based on the Flesch Reading Ease score and other indices.
  • Microsoft Word: Microsoft Word includes a built-in function for checking readability statistics, including the Flesch Reading Ease score and the Flesch-Kincaid Grade Level.

Benefits of using readability tools

Using readability tools offers several advantages:

  • Improved accessibility: Optimizing the readability of content makes it more accessible to a wider audience, including readers with different reading levels.
  • Greater engagement: Texts that are easy to understand hold the reader’s attention, leading to higher engagement and interaction.
  • SEO optimization: Well-readable text contributes to better SEO performance, as search engines reward content that provides a positive user experience with higher rankings.
  • Efficiency in editing: Readability tools speed up the editing process by quickly identifying areas that need improvement, making for a more efficient workflow.

Integrating readability tools into the writing and editing process is a step forward toward creating high-quality, accessible and SEO-friendly content. By striving for texts that are not only informative but also easy to understand, one can reach a wider audience and make a deeper impact.


Optimizing content for readability is essential for improving user experience and SEO performance. By using readability tools and best practices, such as writing short sentences and using everyday words, content can be made more accessible to a wider audience. This contributes to higher engagement, better search engine rankings and ultimately more successful communication.

Tan, P. (2024, Jan. 8). Content Optimization: The Complete guide. SEO Blog By Ahrefs. https://ahrefs.com/blog/content-optimization/

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Ralf van Veen

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This article was originally published on 22 April 2024. The last update of this article was on 22 April 2024. The content of this page was written and approved by Ralf van Veen. Learn more about the creation of my articles in my editorial guidelines.