Lexical Diversity Calculator
Calculate the lexical diversity and vocabulary richness of any text. Type-Token Ratio (TTR), Mean TTR, and vocabulary density.
About This Free Online Lexical Diversity Calculator
Our free online Lexical Diversity Calculator measures how varied your vocabulary is using Type-Token Ratio (TTR) — the ratio of unique words (types) to total words (tokens). A higher TTR indicates greater vocabulary diversity. The tool also provides a Mean TTR score using sentence-level segmentation, giving a more robust measure for longer texts. Perfect for writers, linguists, students, and editors who want to analyze vocabulary richness and avoid repetitive language.
Features of Our Lexical Diversity Calculator
- Type-Token Ratio (TTR) calculation
- Mean TTR (MTTR) for robust scoring
- Total unique word count (types)
- Total word count (tokens)
- Vocabulary density percentage
- Real-time analysis as you type
- 100% private — browser-only processing
How to Use the Lexical Diversity Calculator
Using this tool is simple and requires no signup or registration. Follow these steps:
- Paste your text into the input area.
- View your TTR score and vocabulary richness metrics instantly.
- Check the Mean TTR for a sentence-averaged diversity score.
- Use the analysis to identify repetitive vocabulary.
Frequently Asked Questions About Lexical Diversity Calculator
What is a good TTR score?
TTR ranges from 0 to 1. Higher scores (0.6+) indicate high vocabulary diversity. Lower scores (below 0.4) suggest repetitive vocabulary. For longer texts, TTR naturally decreases, which is why Mean TTR is more reliable for longer documents.
What is the difference between TTR and Mean TTR?
TTR divides unique words by total words for the entire text. Mean TTR calculates TTR separately for each sentence and averages them, providing a more stable measure for longer texts.
Who uses lexical diversity analysis?
Linguists, writers, educators, and content editors use lexical diversity to assess vocabulary range, avoid repetition, and ensure engaging text for readers.
Why Choose Text Toolbox?
Text Toolbox provides free, private, and instant online text tools. Unlike other text utility websites that require signup accounts or send your data to servers, all our tools process your text entirely in your browser. This means your content never leaves your device — we cannot see it, store it, or share it. Our tools are fast, lightweight, and work on any device with a modern web browser.