Free tool
Readability Checker
Reading ease, grade level, sentence length distribution and long-sentence flags.
Runs entirely in your browser. Nothing is uploaded.
Flesch reading ease
42.6
Grade level
13.2
Band
Hard
Avg sentence length
23.5
Sentences over 25 words
0
Complex words
12.8%
Most general business content should land between 50 and 70 on Flesch, and grade 8 to 10. Technical documentation scores lower and that is usually correct — use the sentence-length flags rather than the headline score to find genuinely tangled passages.
About the readability checker
What the scores mean
Flesch Reading Ease runs 0–100, where higher is easier. Most general web content should land between 50 and 70. Flesch-Kincaid converts the same inputs into a US grade level; grade 8 to 10 suits most business audiences.
Readability and retrieval
Long, clause-heavy sentences chunk badly. A sentence that runs forty words and carries three dependent clauses is hard to extract as a standalone answer, which makes it less likely to be cited even when it is correct.
Do not over-optimise for the score
These formulas count syllables and sentence length. They cannot tell whether your writing is clear. A technical audience is not served by artificially short sentences — use the score to catch genuinely tangled passages, not as a target.
Questions
Is readability a Google ranking factor?
Not as a direct measured score. It affects engagement, comprehension and how easily passages can be extracted, all of which have downstream effects.
What score should I aim for?
For general business content, Flesch 50–70 and grade 8–10. For technical documentation, lower scores are normal and appropriate.
One page at a time is slow.
Aeologic runs these checks across every URL you own and tells you which twenty to fix first.
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