Text UtilitiesText CheckersFree Tool
Readability Checker
Calculate the Flesch Reading Ease score and estimated US grade level for your text, using sentence length and an approximate syllable count.
How to Use Readability Checker
- 1Paste your text
- 2View the Flesch Reading Ease score and grade level
- 3Check the words/sentences/syllables breakdown for context
Frequently Asked Questions
Using the standard formula: 206.835 minus 1.015 times average words-per-sentence minus 84.6 times average syllables-per-word. A higher score (up to 100) means easier to read; lower scores indicate more complex text.
They share the exact same Flesch Reading Ease calculation code — this page and [Content Readability Checker](/tool/content-readability-checker) produce identical results, just organized under different categories.
It uses a common vowel-cluster pattern-matching heuristic, not a real dictionary lookup — this gets most everyday English words right but can miscount unusual words, proper nouns, or non-English terms, which slightly affects the final score's precision.
It's the approximate U.S. school grade level a reader would need to easily understand the text, mapped from Flesch score ranges (e.g. 90+ is 5th grade/very easy, below 30 is professional/very difficult).
No — the calculation happens entirely in your browser.
Related Tools
Word Counter
Count words, total characters, and characters excluding spaces in your text, updated instantly.
Sentence Counter
Count sentences by splitting text on periods, question marks, and exclamation points — a simple heuristic, not full grammatical parsing.
Syllable Counter
Estimate syllable count per word using a vowel-group heuristic — the same logic used by the Syllable Counter (Advanced) tool.
Content Readability Checker
Paste your content to get its word count, sentence count, average sentence length, and an estimated Flesch-Kincaid grade level.