Tools
Reading age calculator: Flesch-Kincaid grade level
Reading age calculator: get the Flesch-Kincaid grade level of your text, the reading age it implies and its longest sentences. Free, runs in your browser.
Flesch reading ease and reading time calculator
Flesch reading ease calculator with reading time: score pasted text and see its band, word, sentence and syllable counts. Free, runs in your browser.
Runs entirely in your browser. Nothing you enter is uploaded, logged or stored.
Key takeaways
- The Flesch reading ease score comes from a published 1948 formula that weighs average sentence length and average syllables per word.
- A higher score means easier text, and the published bands run from very easy at 90 to 100 down to very confusing at 0 to 29.
- Reading time is estimated at 238 words per minute, the adult silent reading average for non-fiction from a 2019 meta-analysis of 190 studies.
- Syllable counting here is a vowel-group heuristic rather than a dictionary lookup, so it will miscount some words.
- Sentence counting splits on end punctuation and cannot always distinguish an abbreviation from a real sentence break.
What it takes
- Body text pasted or typed into the textarea
How to use it
- 1Paste your draftUse the body copy you intend to publish, not a summary. The formula reads sentence and word structure, so the exact draft matters.
- 2Read the word and sentence countsThese come from a straightforward split on whitespace and on end punctuation, shown so you can sanity check the rest of the numbers.
- 3Check the Flesch score and its bandThe score is shown on a 0 to 100 scale with its band. The published table calls 60 to 69 standard and 70 and above fairly easy or easier.
- 4Use the reading time as a planning numberIt is an average, not a guarantee for any one reader. Treat it as the time a typical adult needs to read the draft once, silently.
Word count and sentence count are simple to get right. Readability is not, which is why the Flesch reading ease score exists: it turns sentence length and word length into one number. This Flesch reading ease calculator computes that score, its band and a reading time estimate in your browser as you type. Nothing you paste is sent anywhere.
What the calculator measures
The score uses the formula Rudolf Flesch published in 1948, as documented by Readability Formulas: 206.835 minus 1.015 times the average words per sentence, minus 84.6 times the average syllables per word. The two weights tell you where edits pay off. Each extra word in the average sentence costs about 1 point; each extra 0.1 syllables in the average word costs about 8.5 points. Shorter words move the score faster than shorter sentences do.
Reading time is the word count divided by 238, the average adult silent reading rate for English non-fiction in Brysbaert’s 2019 meta-analysis of 190 studies. Under a minute it is shown in seconds; above that, in minutes to one decimal place.
How to read the results
The tool shows five counts, then the score and its band:
| Score | Band |
|---|---|
| 90 to 100 | Very easy |
| 80 to 89 | Easy |
| 70 to 79 | Fairly easy |
| 60 to 69 | Standard |
| 50 to 59 | Fairly difficult |
| 30 to 49 | Difficult |
| 0 to 29 | Very confusing |
The formula can return values below 0 or above 100; the tool clamps the displayed score to that range. The score describes surface complexity only. It does not read for meaning, logic or accuracy, so a string of short broken sentences can score high and a precise technical sentence can score low. Use it to compare drafts of the same piece, not to grade writing quality.
Worked example
The text the tool opens with is a 67-word paragraph of four sentences. The tool reports:
- Words: 67. Sentences: 4. Avg words / sentence: 16.8.
- Syllables (approx.): 92.
- Reading time: 17 sec.
- Flesch reading ease: 73.7, fairly easy.
The arithmetic: 206.835 minus 1.015 times 16.75, minus 84.6 times 92 divided by 67, which is about 73.7.
Mistakes it catches, and makes
Pasted into the tool, the usual causes of a low score show up in the counts: an average sentence length in the twenties or thirties, and a syllables-per-word ratio pushed up by long abstract nouns. Split the longest sentences and swap the longest words, then watch the score move.
The tool has two honest limits. Sentence counting splits on a period, exclamation mark or question mark followed by a space, so “Dr. Smith arrived today. He left early.” counts as three sentences, not two. That understates the average sentence length for text with many abbreviations or initials. Syllable counting groups vowels, drops a silent trailing e and has no pronunciation dictionary, so it misjudges some irregular words. Paste a full paragraph or more: short inputs swing widely on both heuristics.
Related tools and reading
Sources
- 1.Learn about the Flesch Reading Ease Formula - Readability FormulasPrimary
- 2.How many words do we read per minute? A review and meta-analysis of reading rate - Journal of Memory and LanguagePrimary
Common questions
What is a good Flesch reading ease score?
There is no single target in the formula's reference table. It labels 60 to 69 standard, 70 to 79 fairly easy, 80 to 89 easy and 90 to 100 very easy, down to very confusing at 0 to 29. Pick the band that fits your audience, then use the score to see whether an edit moved you toward it.
Where do the 206.835, 1.015 and 84.6 numbers come from?
They are the coefficients of Rudolf Flesch's 1948 reading ease formula: 206.835 minus 1.015 times average sentence length minus 84.6 times average syllables per word. This tool applies them unchanged.
Why does the reading time not match how fast I actually read?
238 words per minute is the average adult silent reading rate for English non-fiction from a meta-analysis of 190 studies. The same paper puts most adults between 175 and 300 words per minute for non-fiction, so any one reader can be well off the average.
Can I trust the syllable count for every word?
No. It counts vowel groups and handles a few common English patterns, such as a silent trailing e, but it has no dictionary of real pronunciations. Words with unusual spelling, proper nouns and loanwords are the most likely to be miscounted.
Why can the score look different from other readability tools?
Tools agree on the formula but not on how they count sentences and syllables. This one splits sentences on a period, exclamation mark or question mark followed by a space, and counts syllables by vowel groups, so a text full of abbreviations or unusual words can score a few points away from another tool.
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