Readability Score Calculator — Free Online Flesch & Readabil

Calculate Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, and Coleman-Liau scores for any text. Instant readability analysis with plain-English labels — fully client-side. This free online readability score calculator runs entirely in your browser — no data is ever uploaded to a server. (It is fully client-side: nothing you type is sent anywhere.)