Analyze text with comprehensive statistics including words, syllables, sentences, vocabulary richness, and grade level.
This tool takes a block of text and returns its vital statistics: word, sentence, and syllable counts, unique words, vocabulary richness, and a grade level. Counts are mechanical - words split on spaces, sentences end at terminal punctuation, syllables are estimated from the written word - so the same input always gives the same output. What surprises most users is the grade level: it comes from a readability formula, not a judgment, and different formulas score the same text differently. On very short texts the number can swing especially wide.
A concrete input and expected output from the current implementation.
Input
A quick brown fox jumps over the lazy dog.
Expected output
Words: 9 | Sentences: 1 | Syllables: 11 | Unique words: 9 | Type-token ratio: 1.00 | Letters: 33 | Grade level: ~2.3 (Flesch-Kincaid)
The counts follow standard conventions: 9 words in one sentence; over and lazy carry two syllables each and the rest one, for 11 total; no word repeats, so all 9 are unique and the type-token ratio is 9/9 = 1.00; the text contains 33 letters. The grade level applies the Flesch-Kincaid formula, 0.39 x (words/sentences) + 11.8 x (syllables/words) - 15.59 = 0.39 x 9 + 11.8 x 11/9 - 15.59, about 2.3. Other formulas give nearby but different numbers, so treat grade level as approximate.
The text is split into words on whitespace and into sentences at terminal punctuation, so the counts are deterministic: the same paste always produces the same numbers. Syllable counts are estimates computed from the written word rather than from pronunciation, so a word such as hour can count as one syllable even though it is spoken with two. These are conventions, and no two counters apply them identically.
The unique-word count divided by the total word count gives the type-token ratio, the vocabulary-richness figure: 1.00 means no word repeats, and lower values mean more repetition. The grade level comes from a readability formula that weights sentence length together with word length or syllable load. Such formulas are published and standardized, but each weighs the factors differently, so the number is a guide, not a measurement.
Because syllables are counted from the written word, not by listening. The rules exist so that the count is computable and repeatable, but they are not phonetics: hour is spoken with two syllables yet may count as one, and silent letters are ignored. If a count looks wrong, check the spelling first - the rule is probably working as designed.
No. A grade level is a readability formula built mostly from sentence length and word difficulty, and it says nothing about clarity, logic, or correctness. A short, choppy text of easy words can score very low and still be badly written. Use it as a rough audience check, compare it only with the same formula, and read the text yourself before trusting the number.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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