You've spent hours crafting a blog post. The information is solid. The structure is good. But readers are bouncing after 20 seconds. One likely culprit: readability.
Readability is how easy your text is to understand. And while it sounds like a "nice to have," it directly affects bounce rate, time-on-page, and social shares — all of which feed back into your search rankings.
What is the Flesch-Kincaid readability score?
The Flesch Reading Ease score is the most widely used readability metric. Developed by Rudolf Flesch in 1948 and later adapted by J. Peter Kincaid, it calculates readability based on two factors: average sentence length and average syllables per word.
The score runs from 0 to 100. Higher scores mean easier reading. Here's what each range means in plain terms:
What score should blog posts aim for?
For most blog content targeting general audiences, the sweet spot is a Flesch score of 60–70. This corresponds to an 8th–9th grade reading level — accessible to the vast majority of adult internet readers, but not dumbed down.
However, the ideal score varies significantly by content type and audience:
Does readability score affect SEO?
Readability isn't a direct ranking signal in Google's algorithm — Google hasn't confirmed it as a factor. But readability has powerful indirect effects on SEO that are very well established:
How to check your readability score for free
Use our free Readability Checker to get your Flesch-Kincaid score instantly. Paste your content, and you'll see your score, grade level, and specific suggestions to improve it. No signup, no download, completely free.
Paste this article's text (or any content you're working on) into the readability checker. It scores your content on the Flesch-Kincaid scale and tells you exactly what to fix.
Check My Readability Score →7 ways to improve your readability score
If your content is scoring below 60, here are the most effective changes to make:
Sentences over 25 words significantly hurt readability scores. Find your longest sentences and cut them at natural transition points — "and," "but," "which," "because."
Polysyllabic words (words with 3+ syllables) drive scores down. "Utilise" → "use." "Methodology" → "method." "Subsequently" → "then." Every substitution helps.
"The report was written by the team" → "The team wrote the report." Active voice is shorter and more direct — both traits that improve readability scores.
Breaking up long blocks of text with H2/H3 subheadings and bullet lists gives readers a visual break. It also makes the content more skimmable — which is how most people read blog posts.
Dense walls of text are intimidating, especially on mobile. Short paragraphs feel faster to read — even when the total word count is the same.
Words like "however," "therefore," "in addition," and "as a result" help readers follow your logic without having to re-read. They're also a Yoast SEO signal for coherence.
If you run out of breath before finishing a sentence, it's too long. If you stumble over a word, your readers probably will too. Your ears will catch what your eyes miss.
For general blog content, aim for a Flesch-Kincaid score of 60–70. Check your score before publishing. Fix sentences above 25 words. Replace multi-syllable jargon with simpler alternatives. The goal isn't dumbing down your content — it's respecting your reader's time and attention.
Check My Score Now →