Readability Score Calculator
Flesch Reading Ease and grade level
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Working out Flesch Reading Ease and grade level is easier with Readability Score Calculator, which answers as you type. Just enter Total Words, Total Sentences and Total Syllables; Readability Score updates the result as you type. Readability Score puts the headline number first. Anyone comparing options in Tech & Digital can use Readability Score to compare scenarios. Nothing is uploaded while Readability Score works, and the figures stay put. Readability Score sits in the Tech & Digital section next to free online readability score calculator and readability score calculator flesch reading ease grade. Run Readability Score twice to find the driving input. Readability Score stays bookmarked for next time.
What the defaults give
100 words, 8 sentences, 140 syllables returns a Flesch score of 75.7 — “fairly easy” — and an estimated grade level of 5.8.
Average sentence length is 12.5 words and average word length is 1.4 syllables, both squarely in plain-English territory.
Two formulas, one text
Flesch Reading Ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)
Grade level = 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59
The first is the original Flesch score, where higher is easier and 60–70 is plain English. The second is the Flesch–Kincaid grade, where higher is harder and the number maps roughly to a US school year. Both are driven by the same two ratios, which is why they always move together.
Worked examples
100 words, 8 sentences, 140 syllables → 75.7, grade 5.8
The same words in 4 longer sentences → 63.0, grade 10.7
The same words in 16 shorter sentences → 82.1, grade 3.4
Syllables up to 280 → −42.7, grade 22.3
Syllables down to 70 → 134.9, very easy
Sentence length is the cheaper lever. Halving it from 12.5 words to about 6 raises the score by nearly seven points without touching a single word choice. Cutting syllables means replacing Latinate vocabulary with Anglo-Saxon: “use” for “utilise”, “help” for “facilitate”.
Reading the bands
90 and above is very easy, 80–90 easy, 70–80 fairly easy, 60–70 standard, 50–60 fairly difficult, 30–50 difficult and below 30 very difficult. A score of 75.7 sits in the fairly-easy band, which is where well-edited news writing lands.
For a general audience, aim for 60–70. Academic and legal writing often scores in the 20s and 30s, and technical documentation for specialists can be difficult without being badly written — the score measures sentence and word length, not clarity.
Where the score misleads
Both formulas ignore meaning. A sentence can be short, monosyllabic and still incomprehensible if the ideas are disordered. Lists and tables score badly because fragments count as sentences, and code samples should be stripped before measuring.
Scores below 0 and above 100 are possible, as the examples show, and they are not meaningful: the curve was fitted to ordinary prose. If you get a negative number, the text has either very long sentences or very high syllable density, or the syllable count was entered by an estimator that over-counts.
Count syllables by hand for a short sample, or use a dictionary-based counter. A quick heuristic over-counts technical terms and proper nouns, which pushes the grade level up by a year or two.
Frequently Asked Questions
What is a good Flesch Reading Ease score?
60 to 70 is plain English and the usual target for a general audience. Above 80 is easy; below 50 starts to feel dense.
What grade level is a score of 75.7?
About 5.8, roughly sixth grade. The number comes from the Flesch–Kincaid formula, not the original Flesch scale.
How do I improve the score fastest?
Shorten sentences. Dropping average sentence length from 12.5 words to 6 raises the score by about seven points on its own.
Why is my score negative?
Very long sentences combined with long words push the formula below zero. The number is outside the range the curve was fitted to, so treat it as “very difficult”.
Does this count syllables automatically?
No. You supply the syllable total, which is the input most people get wrong. Count a 100-word sample by hand and scale it.
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