Analyze any text and get instant readability scores: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, and detailed text statistics.
| Score | Difficulty | Typical Audience |
|---|---|---|
| 90–100 | Very Easy | 5th grade, conversational |
| 70–90 | Easy | 6th–7th grade, consumer content |
| 60–70 | Standard | 8th–9th grade, news articles |
| 50–60 | Fairly Difficult | 10th–12th grade, professional |
| 30–50 | Difficult | College level |
| 0–30 | Very Difficult | Academic / professional specialist |
The Flesch-Kincaid tests are a pair of readability formulas developed by Rudolph Flesch and J. Peter Kincaid in the 1970s for the U.S. Navy. They measure how easy or difficult a piece of English text is to read, based on average sentence length and average syllables per word.
Flesch Reading Ease produces a score from 0 to 100. Higher scores mean easier reading. A score of 60–70 corresponds to plain English suitable for most adults. A score below 30 indicates academic or highly technical text.
Flesch-Kincaid Grade Level maps the same calculation to a US school grade level. A score of 8.0 means the text is appropriate for an 8th grader (age 13–14). Most web content targets a grade level of 6–9.
The Gunning Fog Index, developed by Robert Gunning in 1952, estimates the years of formal education needed to understand text on first reading. It places more weight on "complex words" — words with three or more syllables. A Fog score of 12 corresponds to a high school senior; scores above 17 are considered very difficult.
AI models often produce text that reads at a higher grade level than intended — they favor longer sentences and multi-syllable words. Use this readability checker to verify that AI-generated blog posts, emails, and landing pages are accessible to your target audience. If the grade level is above 10, simplify sentence structure and replace complex words with common alternatives.