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SEO Madmanby Adam Hafez
Free tool

Readability and reading time calculator

Score pasted text with the Flesch reading ease formula and estimate reading time, computed live in your browser from real, cited constants.

Runs entirely in your browser. Nothing you enter is uploaded, logged or stored.

Flesch reading ease
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Sentence counting splits on . ! ? and cannot reliably tell an abbreviation from a sentence end. Syllable counting uses a vowel-group heuristic, not a dictionary. Both are approximations, common to every open readability tool that does not ship a pronunciation dictionary.

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 score bands run from very easy at 90 to very confusing below 30.
  • 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

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How to use it

  1. 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.
  2. 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.
  3. 3Check the Flesch score and its bandThe score runs roughly 0 to 100. Most web and news writing aims for 60 and above, the standard or easier bands.
  4. 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 complexity into a single number that correlates, on average, with how hard a passage is to follow. This tool computes that score and a reading time estimate entirely in your browser as you type.

What the Flesch score actually measures

The formula is 206.835 minus 1.015 times the average number of words per sentence, minus 84.6 times the average number of syllables per word. It rewards short sentences and short words, and it penalizes long ones. A score near 100 describes text built from short sentences and mostly one or two syllable words; a score near 0 describes long sentences built from long words.

The score does not read for meaning, logic or accuracy. A grammatically broken string of short words can score high, and a precise technical sentence that needs its length to stay accurate can score low. Treat the number as a proxy for surface complexity, not as a verdict on whether the writing is good.

Two honest limitations in this tool

Sentence counting splits the text on a period, exclamation mark or question mark. It has no way to know that “Dr. Smith arrived.” is one sentence rather than two, so text with many abbreviations, decimals or initials will read as having more sentences than it actually has, which understates the average sentence length.

Syllable counting groups consecutive vowels and applies a small set of English spelling rules, including dropping a silent trailing e. It is the same approach used by most open readability tools that do not ship a pronunciation dictionary, and it will misjudge some irregular words. The Flesch score computed here should be read as a close estimate, not an exact figure.

Paste a full paragraph, not a single sentence, for a stable score: short inputs swing widely on both the sentence-splitting and syllable-counting heuristics above.

Sources

  1. 1.Learn about the Flesch Reading Ease Formula - Readability FormulasPrimary
  2. 2.How many words do we read per minute? A review and meta-analysis of reading rate - Journal of Memory and LanguagePrimary

Frequently asked questions

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, published as 206.835 minus 1.015 times average sentence length minus 84.6 times average syllables per word. The constants have not changed since; they are reproduced in readability references and in most editing software.

Why does the reading time not match how fast I actually read?

238 words per minute is a population average for silent reading of non-fiction text, drawn from a meta-analysis of 190 studies. Individual readers vary widely, and denser or more technical text is read more slowly than the average passage the studies sampled.

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.

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