Readability Score Checker

How to use

1. 1Paste your writing into the input on the left. Counts and scores update as you type.
2. 2Read the Reading level summary card for the Flesch Reading Ease band and the averaged grade level across all formulas.
3. 3Compare each formula in the All readability formulas section. Values use the standard public-domain equations shown in How each formula is calculated.
4. 4Switch the Sentence breakdown filter to Hard sentences to see only the lines flagged at Flesch-Kincaid grade 12 or above. Rewrite or split those first.
5. 5Click Copy report to grab a plain-text summary you can paste into a doc, a code review, or a content brief.

About this tool

Readability Score Checker analyzes your writing with the six most widely cited readability formulas and runs every calculation locally in your browser, so drafts, contracts, and unpublished copy are never uploaded. Paste an article, an email, a landing page, a course chapter, a help-center entry, or any block of prose, and the tool tokenizes it into words, sentences, syllables, complex words (3 or more syllables, excluding common -es, -ed, and -ing inflections on a 2-syllable stem), and characters using a deterministic algorithm. Six formulas are computed at once: Flesch Reading Ease (a 0 to 100 score where 60 to 70 is the plain-English target for general adult audiences), Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau Index, the Automated Readability Index, and the SMOG Index. The summary panel maps the Flesch Reading Ease score to a labeled audience band (Very easy, Easy, Plain English, Difficult, Very difficult) and shows an averaged grade level so you can answer the most common question ("what reading level is this?") with one number. A per-sentence breakdown then shows every sentence in the input with its own word count, syllable count, and Flesch-Kincaid grade, with hard sentences (grade 12 and above) highlighted in rose so you can find and rewrite the specific paragraphs that are dragging your score up. The Reading ease bands panel describes who each band is written for so a writer targeting a 9th-grade audience knows exactly what score to aim at, and the formulas section shows the full equation behind every metric for transparent, auditable scoring. Useful for content writers tuning blog posts to a target grade, marketers preparing landing-page copy for general audiences, technical writers checking that documentation reads at a 9th-grade level, accessibility teams auditing public-facing pages, healthcare and government writers required to publish at specific grade levels under plain-language laws, teachers and editors reviewing student work, and anyone preparing material that has to be understood on a first reading. Scores are estimates, not verdicts: read the highlighted hard sentences, replace the longest words with everyday equivalents where precision is not lost, and split the longest sentences into shorter ones, then rerun and watch the scores move.

Free to use. Works in your browser. No signup, no login.