How To İmprove Readability Scores
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Flesch Reading Ease
Readability scores turn “how hard is this to read?” into a number. The formulas have been around since the 1940s, were adopted by the US military in the 1970s, and still shape style guides at publishers, law firms, and government agencies today. A Flesch Reading Ease of 60 is roughly an 8th-9th grade reading level; below 30 reads like academic prose; above 80 reads like a children’s book. The numbers are rough proxies, not oracles, but they are consistent enough to catch prose that has drifted too dense for its audience. This guide covers the main formulas (Flesch-Kincaid, Flesch Reading Ease, Gunning Fog, SMOG, Coleman-Liau, ARI), how they differ, concrete tactics to bring scores down, target grade levels for common content types, and the limits of the metrics.
Flesch-Kincaid Grade Level
Marketing copy targets grade 6-8. News writing targets grade 8-10 (the AP Style Guide recommends 8). General blog posts target grade 8-12. Technical documentation targets grade 10-14. Legal and academic writing often scores grade 16-20 but should still be simplified where possible. Government plain-language guidelines, including the US Plain Writing Act of 2010, recommend grade 8 for public-facing communication. Email subject lines and social posts target grade 3-5 for maximum comprehension under time pressure.
Gunning Fog Index
Shorten sentences. The single biggest driver of a high grade level is long sentences with many clauses. Split sentences over 25 words into two or three. Replace polysyllabic words with shorter synonyms when they carry the same meaning: “use” for “utilize”, “help” for “facilitate”, “start” for “initiate”, “show” for “demonstrate”. Replace passive voice with active voice. Remove hedges and intensifiers (“very”, “quite”, “arguably”) that add length without meaning. Break up long paragraphs. Each of these moves a score down and each is visible to the reader.
SMOG Index
Writing to hit a specific score rather than to serve the reader produces stilted prose. Extremely short sentences read choppy. Banning all polysyllabic words strips out precise technical terms. Treat the score as a signal, not a target. If your content scores grade 14 and the audience is engineers, that is probably fine. If it scores grade 14 and the audience is consumers, rewrite. The number tells you whether to look more closely, not what to do.
Coleman-Liau and ARI
Legal, medical, and scientific writing necessarily contains terminology that raises scores. Some tools let you add a custom whitelist of domain terms to exclude from complex-word counts. That produces a more honest score of the overall writing style, separate from the unavoidable vocabulary. If your content is technical, measure readability on the prose around the jargon, not the jargon itself.
Target grade levels by content type
Formulas only measure text. They do not measure whether a document is organized clearly, has useful headings, includes diagrams, or breaks up long lists. A grade-8 wall of text is harder to read than a grade-10 page with clear sections and visuals. Use readability scores alongside structural checks: heading hierarchy, paragraph length, line length, scannability. A score of 8 with a bad structure still reads poorly.