Lexical Diversity Calculator

Paste text to compare total words, unique normalized words, TTR, root TTR, corrected TTR, and Herdan C.

Vocabulary variety

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0Total words

0Unique words

—Root TTR

—Corrected TTR

TTR = unique words ÷ total words

Core counting & writing metrics

Start with the broad counter that matches the question, then move to focused frequency, reading-time or syllable analysis. Specialist readability, repetition and writing-goal tools remain available from the full hub.

All 28 text analysis tools

Word CounterWords, characters, structure & reading time Character CounterCharacters, code points & limits Sentence CounterSentence count & average length Paragraph CounterParagraph blocks, words & lines Line CounterLogical, empty & non-empty lines Word FrequencyTop terms & vocabulary diversity Reading TimeWords to minutes at a chosen WPM Syllable CounterSyllable estimate & density

Measure vocabulary variety

The basic type-token ratio divides unique normalized word forms by total words. Root TTR, corrected TTR, and Herdan C add alternative views because ordinary TTR usually falls as a text sample gets longer.

Compare similar sample lengths

Lexical-diversity metrics are sensitive to tokenization, inflection, language, genre, and sample length. Use them as descriptive signals rather than universal writing-quality scores.