Check the readability of any text free online. Get Flesch-Kincaid Reading Ease, Grade Level, Gunning Fog, and SMOG scores instantly — no signup needed.
This readability score checker online free analyses your text using four industry-standard formulas and tells you how easy it is to read. Paste any content and click Check Readability to get your scores in seconds. The Flesch Kincaid score checker is the most widely used metric: a Reading Ease score above 60 is easy to read; below 30 is difficult. The Grade Level score tells you the US school grade needed to understand the text — aim for 8–10 for general web content. Gunning Fog Index measures the proportion of complex words (three or more syllables) and tends to penalise technical writing heavily. SMOG (Simple Measure of Gobbledegook) is preferred in healthcare communications because it counts polysyllabic words per 30-sentence sample. All four scores update after each analysis, with plain-English interpretations and targets alongside each result. Great for blog posts, emails, HR documents, and any content where clarity matters.
The Readability Checker calculates multiple readability scores for your text to estimate how easy it is to read and what education level it targets. It computes the Flesch Reading Ease score (0–100, higher is easier), the Flesch-Kincaid Grade Level (equivalent US school grade), the Gunning Fog Index, the SMOG Index, and the Coleman-Liau Index. Each formula uses different combinations of sentence length, word length, and syllable count to arrive at its estimate. The tool also shows average sentence length (aim for 15–20 words) and the percentage of complex words (three or more syllables) as diagnostic signals. Readability scores update as you type so you can refine your writing in real time.
Formula
Flesch Reading Ease = 206.835 − (1.015 × avg sentence length) − (84.6 × avg syllables/word) Flesch-Kincaid Grade = 0.39 × avg sentence length + 11.8 × avg syllables/word − 15.59
| Score | Difficulty | Typical Reader | Example |
|---|---|---|---|
| 90–100 | Very Easy | Ages 10–11 | Comic books |
| 80–90 | Easy | Ages 11–12 | Popular fiction |
| 70–80 | Fairly Easy | Ages 13–15 | Teen magazines |
| 60–70 | Standard | Ages 15–17 | Newspapers, blogs |
| 50–60 | Fairly Difficult | College level | Academic articles |
| 30–50 | Difficult | Degree-educated | Scientific journals |
| 0–30 | Very Confusing | Graduate level | Legal documents |
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