Lexical Diversity Calculator

Lexical Diversity (%):


About Lexical Diversity Calculator (Formula)

A Lexical Diversity Calculator is a tool used in linguistics and text analysis to measure and quantify the diversity of words used in a given text or dataset. Lexical diversity is a crucial metric that provides insights into the richness and variety of vocabulary in a piece of writing or spoken language. The formula for calculating lexical diversity depends on the specific measure or index used, with one common measure being the Type-Token Ratio (TTR):

Type-Token Ratio (TTR) = (Number of Unique Words (Types)) / (Total Number of Words (Tokens))


  • Number of Unique Words (Types) refers to the total count of distinct words or unique vocabulary items in the text.
  • Total Number of Words (Tokens) represents the overall word count in the text, including repetitions.

The Type-Token Ratio (TTR) is a simple but effective measure of lexical diversity. It quantifies how many unique words are used in proportion to the total number of words in a text. A higher TTR value indicates greater lexical diversity, suggesting a richer vocabulary, while a lower TTR value suggests repetitive or limited vocabulary use.

To use the Lexical Diversity Calculator, you need to analyze the text or dataset of interest and determine both the number of unique words (types) and the total word count (tokens). Inputting these values into the formula will yield the Type-Token Ratio, providing a quantitative measure of lexical diversity.

Lexical diversity calculations are valuable in various fields, including linguistics, education, natural language processing (NLP), and text analysis. Researchers and educators use lexical diversity metrics to assess language proficiency, evaluate writing quality, and gain insights into language variation and development.

In summary, a Lexical Diversity Calculator is a useful tool for linguists, educators, and researchers seeking to quantify and analyze the richness and variety of vocabulary in texts and spoken language. It provides an objective measure of lexical diversity, facilitating a deeper understanding of language usage and proficiency.