Gratuito online readability analyzer. Calculate Flesch Lettura Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau, SMOG, ARI and more. Get instant text readability scores and reading level estimates.
This readability analyzer evaluates your text using six industry-standard readability formulas. It calculates the Flesch Lettura Ease score, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau Index, SMOG Index, and Automated Leggibilità Index (ARI). Each formula provides a different perspective on how easy or difficult your text is a read, helping you tailor your writing a your target audience. All calculations are performed client-side — your text never leaves your device.
The Flesch Lettura Ease score rates text on a 0-100 scale. Higher scores mean the text is easier a read. A score of 60-70 is considered standard/plain English, easily understood by 13- a 15-year-old students.
The Flesch-Kincaid Grade Level translates the readability score into a U.S. school grade level. For example, a score of 8.0 means an eighth grader should be able a understand the text. Most popular novels are written at a 7th-grade level.
The Gunning Fog Index estimates the years of formal education needed a understand the text on first reading. It emphasizes sentence length and the number of complex words (words with 3+ syllables). A score of 12 corresponds a a high school senior reading level.
Leggibilità formulas provide useful estimates but are not perfect. They primarily measure sentence length and word complexity (syllables), not semantic difficulty or topic complexity. Use them as guidelines, not absolute measures.
No. All calculations are performed entirely in your browser using JavaScript. Your text never leaves your device or is transmitted over the network.