Lexical diversity measures how varied your vocabulary is, which is a useful signal of richness in essays, fiction and language learning samples. The core metric is the type token ratio, or TTR, the number of unique words divided by the total number of words, expressed as a percentage. A higher ratio means you repeat words less and reach for a broader vocabulary. Because raw TTR falls as texts get longer, this calculator also reports the root type token ratio, unique words divided by the square root of total words, which is far more stable across different lengths and lets you compare passages fairly. It shows unique words, total words and the ratio of the most repeated word too. Results update as you type and everything is computed locally in your browser, so your writing is analyzed privately and never leaves your device.
The type token ratio is the number of unique words divided by the total words, so a higher ratio means a richer, more varied vocabulary.
Plain TTR falls as text gets longer, so root TTR adjusts for length to give a fairer comparison across passages of different sizes.
Low diversity means many repeated words, which can indicate limited vocabulary or heavy repetition worth revising.
Lexical diversity measures how varied your vocabulary is, which is a useful signal of richness in essays, fiction and language learning samples. The core metric is the type token ratio, or TTR, the number of unique words divided by the total number of words, expressed as a percentage.
Yes. Lexical Diversity Calculator is completely free, with no sign-up and no usage limits.
Yes. Lexical Diversity Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Lexical Diversity Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.