Readability Checker Guide
A readability checker evaluates how easy your text is to read and projects a US grade level using established formulas like Flesch-Kincaid, Gunning Fog, and Coleman-Liau. Writers, educators, and UX designers use it to match reading level to target audience, ensuring that technical documentation, marketing copy, and educational material land at the right difficulty. The tool surfaces a grade level plus a readability score, so you can see whether your prose is too dense, too simple, or right on target. It is the fastest way to confirm that your audience will actually finish what you wrote. The checker parses your text into sentences, words, and syllables, then feeds those counts into multiple readability formulas. Flesch-Kincaid Grade Level uses average sentence length and average syllables per word to estimate the US grade needed to understand the text. Gunning Fog Index adds complexity for words with three or more syllables, while Coleman-Liau relies on character counts rather than syllables to avoid pronunciation ambiguity. Each formula produces its own grade-level estimate, and the tool displays them side by side so you can spot outliers.