What this measures
Two industry-standard readability scores:
Flesch Reading Ease runs 0 to 100, higher = easier. Above 90 is 5th-grade level; below 30 is college-graduate. Most plain-language style guides target 60+.
Flesch, Kincaid Grade Level maps the same data to a US school grade. A score of 8.4 means an 8th-grader can read it without trouble.
Both use the same two inputs: average sentence length (words per sentence) and average word length (syllables per word). Long sentences with long words score harder; short sentences with short words score easier. That’s the entire model.
The calculator counts words, sentences, and syllables for the text you paste, applies both formulas, and shows the result with a band label so you don’t need to memorize what “60” means.
How the syllable count works
Counting syllables in English is genuinely hard, the rules have so many exceptions that even academic linguistic software disagrees on edge cases. The calculator uses a heuristic that catches most cases:
- Count vowel groups in the lowercase word (consecutive vowels = one syllable)
- Subtract silent endings (final ‘e’, past-tense ‘-ed’ after consonants)
- Words with 3 or fewer letters always count as 1 syllable
This is accurate to within ±5% on typical English prose. For poetry or technical jargon with unusual constructions, expect more drift.
When this matters
Plain-language compliance. Government agencies (especially health, legal, and insurance) require communications to be readable. The US Plain Writing Act of 2010 sets target levels for federal documents; many states require similar standards for consumer disclosures.
Marketing copy. Most B2C copy targets 6th-8th grade level. Above that, readers skim or bounce. Successful blog posts on widely-read sites (BuzzFeed, Medium frontpage) usually score 70+ on Reading Ease.
Education and ESL. Reading-level scoring tells teachers whether a passage is age-appropriate or whether it’ll frustrate a learner.
Legal documents. A counter-example. Legal text deliberately sits at 30-40 (college-graduate level) because precision requires complex sentence structures and Latinate vocabulary. The score is informative, not a target.
What the score doesn’t capture
Readability scores measure form, not clarity. A passage with short sentences and simple words can still be confusing if the ideas are tangled or the logic is non-linear. Conversely, a long sentence with technical vocabulary can be perfectly clear to its intended audience.
The score also doesn’t measure:
- Voice or style
- Tone (formal vs casual)
- Whether the writing is good or bad in any qualitative sense
- Whether the audience knows the technical terms used
- Cultural references that may or may not land
It’s a useful proxy for “are my sentences too long?” and “am I using too many big words?”, not a substitute for actually reading what you wrote.
Reference scores for famous writing
For calibration:
- Hemingway’s prose: Reading Ease ~85 (very accessible)
- The Wall Street Journal: ~50 (10th-12th grade)
- The Economist: ~40 (college level)
- Academic papers: ~20-30 (college graduate)
- Children’s books (Dr. Seuss): ~95 (5th grade or younger)
- The KJV Bible: ~75 (7th grade), surprising to many
- A typical Reddit post: ~70 (7th-8th grade)
If your writing scores in the 60-80 range, you’re in good company. If you score below 50, your audience needs to be specifically expecting that level, graduate students, specialists, or readers of legal text.
Frequently asked questions
My grade level is 14. Is that bad? For a corporate blog, yes, most readers will skim. For an academic paper, it’s normal. Match the score to the audience.
Why does the same text score differently in different tools? Syllable-counting heuristics vary. Microsoft Word, Hemingway App, and this tool all use slightly different algorithms. Differences of 1-2 grade levels are normal; bigger gaps suggest the tools are measuring different things.
Can I improve my score? Yes, shorter sentences and shorter words. Replace polysyllabic words with monosyllabic synonyms. Break compound sentences into two sentences. Most writing improves measurably with one round of “shorten everything” editing.
Does this work for non-English text? The formulas are calibrated for English. They produce numbers for any text but the numbers won’t be meaningful for German, French, Mandarin, etc. Each language has its own readability research and its own formulas.