Lexical Diversity Calculator
Measure vocabulary richness with type-token ratio, Guiraud, and Herdan metrics.
Measure lexical diversity in writing
Lexical diversity describes how varied the vocabulary is in a passage. This calculator tokenizes alphabetic words (case-insensitive), counts total tokens N and unique types V, then reports classic readability-style metrics used in linguistics and SEO content audits.
Metrics explained
- Type-token ratio (TTR): V / N, simple but shrinks as text grows.
- Root TTR (Guiraud): V / √N, reduces length bias.
- Corrected TTR: V / √(2N), another length-normalized variant.
- Herdan's C: log V / log N, logarithmic diversity index.
- Hapax legomena: words that appear exactly once.
Related: Keyword Density Checker, Count Occurrences.
Frequently Asked Questions
What counts as a word?
Sequences of letters and apostrophes, lowercased for counting. Punctuation and numbers are ignored.
Is high TTR always better?
Not necessarily. Technical docs may repeat precise terms; creative writing may aim for richer vocabulary. Compare similar-length samples.
Is text uploaded anywhere?
No. Analysis runs locally in your browser.
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