The ratio of unique words to total words in a text — sometimes called lexical diversity or type-token ratio — gives a simple numeric sense of vocabulary variety, distinguishing repetitive writing from more varied word choice.
This tool counts total words and unique words (case-insensitive) in your pasted text, then calculates the ratio as a percentage — a higher percentage suggests more varied vocabulary, while a lower one suggests more repetition.
Keep in mind this metric is sensitive to text length: shorter texts naturally tend toward higher ratios since there's less opportunity for words to repeat, so it's most meaningful when comparing texts of similar length.
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Frequently asked questions
What's considered a good unique word ratio?
There's no universal target — it varies by genre and length, but comparing your own drafts over similar length ranges can reveal whether you're relying on repeated phrasing.
Why does text length affect this ratio so much?
Longer texts naturally reuse common words (like "the" and "and") more often simply due to their length, which pulls the ratio down regardless of actual vocabulary richness — this is why it's best compared across similar-length texts.