The Flesch Reading Ease score is the most widely used readability formula in the world. It’s built into Microsoft Word, used by US government agencies, and referenced by writing tools everywhere. The idea is simple: it puts a single number on how easy your text is to read, so you can tell at a glance whether your writing is breezy or a slog. Here’s exactly what the score measures, what the bands mean, and how to nudge your number in the right direction.
What the Flesch Reading Ease score measures
The score boils readability down to two things the formula treats as the main drivers of difficulty:
- Sentence length — average number of words per sentence. Longer sentences are harder to follow.
- Word length — average number of syllables per word. Longer words are harder to process.
That’s it. The formula doesn’t judge vocabulary sophistication, jargon, or logic — just these two structural signals. Which is exactly why it’s so easy to compute and so useful as a quick gauge.
The formula
The Flesch Reading Ease formula is:
206.835 − (1.015 × average words per sentence) − (84.6 × average syllables per word)
You almost never need to run this by hand. Paste your text into the readability score checker and it computes the score, the grade level, and a difficulty rating instantly, updating as you edit. But seeing the formula explains the two levers you can actually pull: shorten sentences (lowers words per sentence) and use shorter words (lowers syllables per word). Both raise the score.
What the score means: the 0–100 scale
The result lands on a 0–100 scale where higher is easier. Here’s how the bands translate:
| Score | Reading ease | Grade level | Example of this style |
|---|---|---|---|
| 90–100 | Very easy | 5th grade | Simple, friendly instructions |
| 80–90 | Easy | 6th grade | Conversational blog posts |
| 70–80 | Fairly easy | 7th grade | Clear consumer writing |
| 60–70 | Standard | 8th–9th grade | Most web content, news |
| 50–60 | Fairly difficult | 10th–12th grade | Detailed articles |
| 30–50 | Difficult | College | Academic, technical |
| 0–30 | Very difficult | College graduate | Legal, scientific papers |
A score can technically go above 100 (very short, simple sentences) or below 0 (extremely long, multi-syllable ones), but almost all real writing falls in the 0–100 range.
What score should you aim for?
For most online writing — blog posts, marketing pages, emails, help docs — aim for 60–70. That’s the “standard” band, readable by the average adult at around an 8th-to-9th-grade level. It’s clear without being childish.
Some context shifts the target:
- Broad consumer content (health info, instructions): aim higher, 70–80+, so nobody is left behind.
- B2B or technical content: 50–60 is acceptable when the audience expects depth — but clarity still wins, and a complex topic doesn’t require complex sentences.
- Academic or legal writing: often sits at 30–50 by necessity, but even there, shorter sentences make dense material easier to follow.
A useful rule: write at the lowest grade level your subject allows. Simpler is almost never worse. For the deeper argument on this, see what is a good readability score.
How to improve your Flesch Reading Ease score
Because the formula rewards short sentences and short words, the fixes are direct:
1. Cut your sentence length
This is the biggest lever. Any sentence over ~25 words is a candidate for splitting. Watch for the words and, but, which, and that — they’re often the seam where one long sentence wants to become two.
Before (long): “The new policy, which was introduced last quarter after extensive consultation with stakeholders across every department, will affect how teams submit their expense reports going forward.” (29 words)
After (split): “We introduced the new policy last quarter after consulting every department. It changes how teams submit expense reports.” (17 words across two sentences)
2. Swap long words for short ones
Multi-syllable words drag the score down. Most have a plain-English alternative:
| Long word | Shorter alternative |
|---|---|
| utilize | use |
| approximately | about |
| demonstrate | show |
| facilitate | help |
| consequently | so |
3. Use active voice
Passive constructions add words and abstraction. “The form was completed by the applicant” (7 words) becomes “The applicant completed the form” (5 words) — shorter sentence, clearer meaning, higher score. Our guide on active vs passive voice shows how to find and fix them.
4. Check as you edit
The score is most useful when it updates live. Paste your draft into the readability score checker and watch the number climb as you split sentences and trade long words for short ones. For more before-and-after examples, see how to improve your readability score.
Flesch Reading Ease vs Flesch-Kincaid Grade Level
People often mix these up because they share an inventor (Rudolf Flesch) and the same two inputs. The difference is the output:
- Reading Ease gives a 0–100 score where higher = easier.
- Grade Level gives a US school grade number where lower = easier.
They measure the same thing from opposite directions. We break down the grade-level version in Flesch-Kincaid grade level explained.
The bottom line
The Flesch Reading Ease score rates readability on a 0–100 scale (higher is easier) based on just two things: average sentence length and average word length. Aim for 60–70 for most web content, higher for broad audiences. To raise your score, split long sentences, swap long words for short ones, and prefer active voice — then watch the number respond live in the readability score checker.
Frequently Asked Questions
What is a good Flesch Reading Ease score?
For most online content, aim for 60–70, the “standard” band readable by the average adult at about an 8th-to-9th-grade level. Broad consumer content should aim higher (70–80+); technical content can sit at 50–60 when the audience expects depth.
How is the Flesch Reading Ease score calculated?
It uses the formula 206.835 − (1.015 × average words per sentence) − (84.6 × average syllables per word). In short, shorter sentences and shorter words produce a higher (easier) score. The readability score checker computes it automatically.
What does a Flesch score of 0 or 100 mean?
A score near 100 means very easy text (short sentences, simple words, around a 5th-grade level). A score near 0 means very difficult text (long sentences, multi-syllable words, college-graduate level). Most real writing falls between the two.
How do I improve my Flesch Reading Ease score?
Shorten your sentences (split anything over ~25 words), replace long words with short ones, and use active voice. These directly lower the two inputs the formula penalizes. Check the score live as you edit so you can see what’s working.
Is a higher or lower Flesch score better?
Higher is easier to read. On the Reading Ease scale, 100 is very easy and 0 is very difficult. This is the opposite of the Flesch-Kincaid Grade Level, where a lower number means easier text.
What’s the difference between Flesch Reading Ease and Flesch-Kincaid Grade Level?
They use the same inputs but report differently. Reading Ease is a 0–100 score (higher = easier); Grade Level is a US school grade (lower = easier). See Flesch-Kincaid grade level explained for the grade-level version.