Readability Analyzer
Check how easy your text is to read using four proven readability formulas — Flesch, Kincaid, Gunning Fog, and Coleman-Liau.
What the Readability Analyzer measures
This tool estimates how hard your writing is to read using four well-established readability formulas: the Flesch Reading Ease, the Flesch-Kincaid Grade Level, the Gunning Fog Index, and the Coleman-Liau Index. Each formula combines factors such as average sentence length, syllables per word, the proportion of complex words, and characters per word to produce a score that maps to a U.S. school grade or an ease rating.
Alongside the four scores you get an overall reading level, your word and sentence counts, the number of complex words (three or more syllables), and your average words per sentence and syllables per word. Together these give a rounded picture of why your text reads the way it does, not just a single number.
How to use it
Paste an article, essay, report, or any text into the box and click "Analyze Readability". The results appear instantly, with each score colour-coded so you can see at a glance whether it lands in an easy, moderate, or difficult range. Hover over the targets shown under each score, such as "Target: below Grade 8", to know what to aim for.
For most general audiences, aim for a Flesch Reading Ease above 60 and a Flesch-Kincaid grade below 8. If a score is higher than you want, shorten your longest sentences, swap multi-syllable words for plainer ones, and break dense paragraphs apart, then re-run the analysis to see the effect of your edits.
Understanding the scores
Flesch Reading Ease runs from 0 to 100, where higher is easier: 90 or above is very easy, around 60 to 70 is standard, and below 30 is very difficult. The Flesch-Kincaid, Gunning Fog, and Coleman-Liau indexes instead report an approximate U.S. grade level, so a result of 8 roughly means an eighth-grader could follow the text.
Because each formula weighs sentence length and word complexity slightly differently, the four scores will not always agree exactly, and that is expected. Read them together as a range rather than chasing one perfect figure. Readability formulas measure structure, not accuracy, logic, or tone, so use them to support clear writing rather than replace careful editing.