Readability Score Checker
Paste your text to instantly calculate its reading grade level and make your writing clearer for your audience.
U.S. school grade level
0-100 (Higher is easier)
Complexity metric
How Readability Formulas Work
When you paste your text, our algorithm analyzes it using the standard Flesch-Kincaid formula. It doesn't actually understand the meaning of your words; instead, it looks at the structural mathematics of your writing.
The formula calculates the total number of words, sentences, and syllables. Texts with long sentences and multi-syllable words receive a higher grade level (harder to read), while short sentences with simple words score lower (easier to read).
Real Worked Examples
Seeing how sentence structure impacts the score makes it easier to optimize your own writing.
"The utilization of sophisticated lexical constructs facilitates the obfuscation of the underlying pedagogical narrative."
- Why it failed: 15 words, but packed with 4- and 5-syllable words.
"Using big words makes your main point harder to understand."
- Why it passed: Same meaning, but only 10 words, and almost all are single syllables. Perfect for a general audience.
Frequently Asked Questions
What is a "good" Flesch Reading Ease score?
For most web content, aim for a score between 60 and 70. This translates to an 8th or 9th-grade reading level, which is easily understood by the average adult reader.
Why did my short sentence get a high grade level?
If your short sentence contains heavy jargon or acronyms (like "telecommunications"), the syllable count spikes. High syllables heavily penalize the readability score.
What's the difference between Flesch-Kincaid and Gunning Fog?
Flesch-Kincaid relies primarily on total syllables. Gunning Fog looks specifically at the percentage of "complex words" (words with three or more syllables). Both output a U.S. grade level equivalent.
Does this checker save my writing?
No. All calculations are performed instantly using JavaScript inside your own browser window. If you refresh the page, the text is gone forever.
Common Use Cases
SEO Content Writers
Google favors content that satisfies user intent quickly. Keeping blog posts at an 8th-grade level reduces bounce rates and improves engagement metrics.
Healthcare Communicators
Medical professionals use readability checkers to translate complex clinical jargon into patient-facing brochures that meet the NIH-recommended 6th-grade reading level.
Cold Email Marketers
Sales emails that score below a 5th-grade reading level get significantly higher response rates because prospects can scan them in under 3 seconds.