Flesch Reading Ease Calculator
Flesch Reading Ease returns a single 0 to 100 score for any piece of writing. Higher means easier. A score of 60 to 70 is the "standard" band — readable by an average 8th or 9th grader. The metric is widely used in publishing, education, plain-language compliance, and SEO.
What Flesch Reading Ease measures
Rudolf Flesch published the Reading Ease formula in 1948 as part of a campaign to make American writing more accessible. He wanted a single, intuitive number — not a grade level, not a percentile, not a fog index — just a score where higher meant easier. The 0 to 100 scale is the result, and it has held up remarkably well for nearly 80 years.
The formula combines two ideas: shorter sentences are easier to read, and shorter words are easier to decode. Both inputs scale linearly into the final score, which means small changes in either dimension produce visible point movements you can use to track edits draft over draft.
How to interpret your Flesch Reading Ease score
| Score | Reading level | Target audience |
|---|---|---|
| 90–100 | Very easy | 5th grade — children's writing |
| 80–89 | Easy | 6th grade — conversational |
| 70–79 | Fairly easy | 7th grade — most blog content |
| 60–69 | Standard | 8th–9th grade — most newspapers |
| 50–59 | Fairly difficult | 10th–12th grade — long-form journalism |
| 30–49 | Difficult | College — academic prose |
| 0–29 | Very confusing | College graduate — technical, legal |
For a general audience, target the 60 to 70 standard band. For marketing copy or any writing optimised for first-impression speed, push into 70 to 80. Anything below 50 is reading like a textbook — fine if that's the audience, but a problem if you're trying to reach the public.
When to use Flesch Reading Ease
- Web content aimed at a broad audience.
- SEO — Google's quality raters reward readable prose, and Yoast SEO uses Flesch Reading Ease as its built-in readability check.
- Email marketing — clearer subject lines and body copy lift open and click rates.
- Patient information leaflets and government forms — both have plain-language guidelines pegged to a Flesch Reading Ease floor.
- Comparing drafts — the 0 to 100 scale makes it easy to talk about "going from 52 to 64" with editors and reviewers.
- Localisation work — comparing Reading Ease before and after a translation is a quick check that nothing got harder.
How Flesch Reading Ease is calculated
Two penalties are subtracted from the constant 206.835: a small one for average sentence length, and a much larger one for syllables per word. Because the syllables-per-word coefficient (84.6) is roughly 80× the sentence-length coefficient (1.015), word choice dominates. Cutting one syllable from each word in a 200-word passage will move the Reading Ease score by far more than cutting two words from each sentence.
That asymmetry is the most useful thing to know about the formula. If you want your score to move, look at vocabulary first — sentence length is a useful secondary lever but not the primary one.
Flesch Reading Ease vs other readability formulas
Flesch-Kincaid Grade Level uses the same two inputs but produces a US school grade. Flesch Reading Ease and Flesch-Kincaid Grade Level move in opposite directions — a Reading Ease of 70 is roughly equivalent to a Flesch-Kincaid grade of 7 (both indicate "fairly easy"). Pick whichever scale matches how your team talks about reading level.
Gunning Fog takes a different approach — it uses the percentage of complex (3+ syllable) words rather than total syllables. Fog tends to penalise jargon-heavy writing more harshly than Flesch Reading Ease does, which makes it a sharper instrument for policy and compliance documents.
Coleman-Liau and ARI both use character counts instead of syllables, which makes them more robust for content with unusual or technical vocabulary where syllable counters get confused. SMOG is the most accurate single formula for healthcare writing but requires at least 30 sentences for a stable score, which makes it less useful for shorter passages.
Frequently asked questions
What is a good Flesch Reading Ease score?
For general-audience writing, target 60 to 70. Marketing copy often aims higher (70 to 80). Academic and technical writing typically falls between 30 and 50. Anything below 30 reads as "very confusing" to most readers.
How do I improve my Flesch Reading Ease score?
Two levers, in order of impact: prefer shorter words where the meaning allows (the formula's syllables-per-word coefficient is ~80× the sentence-length coefficient), then shorten sentences toward 15 to 17 words on average. Vocabulary swaps move the score faster than sentence-length edits.
What is the difference between Flesch Reading Ease and Flesch-Kincaid?
Reading Ease returns a 0 to 100 score (higher is easier). Flesch-Kincaid Grade Level returns a US school grade (lower is easier). Both use the same inputs and are mathematically related — pick whichever scale you prefer.
What Flesch Reading Ease score does Hemingway have?
Hemingway typically scores between 80 and 95 on the Flesch Reading Ease scale — solidly in the "easy" band. His short sentences and short words are a deliberate craft choice.
Can a Flesch Reading Ease score be negative?
Mathematically yes — extremely dense writing can produce a negative raw score. Most calculators (this one included) clamp the result to 0–100 because anything below 0 conveys no additional meaning beyond "very confusing."
Does Flesch Reading Ease work for non-English text?
Not directly. The formula was calibrated against English-language texts. Equivalents exist for Spanish (Fernández-Huerta), German (Wiener Sachtextformel), French (Kandel-Moles), and other languages, each tuned to that language's syllable structure.