What is a Readability Score and Why Does it Matter?

A Readability Score is a mathematical calculation that tells you how easy or difficult your text is to read. It analyzes the complexity of your vocabulary (syllables per word) and the length of your sentences. In the world of digital marketing and SEO, readability is crucial. If your writing is too complex, readers will leave your website (increasing your bounce rate), which signals to Google that your content is not user-friendly.

Our free online Readability Score Checker uses the two most famous and heavily tested algorithms in the world: the Flesch Reading Ease test and the Flesch-Kincaid Grade Level test.

1. Flesch Reading Ease

This formula scores your text on a scale from 0 to 100. The higher the score, the easier the text is to read. Here is how to interpret your results:

• 90 – 100 (Very Easy): Easily understood by an average 11-year-old student.
• 70 – 80 (Fairly Easy): Understood by a 13-to-14-year-old. Best for general consumer content.
• 60 – 70 (Standard): The sweet spot for web copy. Understood by 13-to-15-year-old students.
• 30 – 50 (Difficult): Understood by college students. Appropriate for academic or B2B writing.
• 0 – 30 (Very Difficult): Best understood by university graduates and professionals (e.g., scientific papers, legal documents).

2. Flesch-Kincaid Grade Level

While the Reading Ease test gives you a score out of 100, the Grade Level test translates that complexity into a U.S. school grade level. For example, a score of 8.0 means that an eighth-grader (around 13-14 years old) can understand the document. For most blogs, news articles, and marketing copy, you should aim for a Grade Level between 7 and 9.

The Readability Formulas

If you are curious about the math running behind the scenes of our tool, here are the official formulas developed by J. Peter Kincaid and his team for the U.S. Navy in 1975:

How to Improve Your Readability Score

If your text is scoring as “Difficult” and you want to make it more accessible, use our tool’s breakdown to find the problem. Are your sentences too long? Break them up into two smaller sentences. Are you using complex words? Swap out words with 3 or 4 syllables for simpler, 1-to-2 syllable alternatives.