Unique Word Counter
Count the number of unique (distinct) words in your text and measure your vocabulary richness. A higher ratio of unique to total words indicates more varied, engaging writing.
Total Words
0
Unique Words
0
Vocabulary Richness
0%
Words Used Once
0
What Is Vocabulary Richness?
Vocabulary richness (lexical diversity) measures the variety of words in a text. It is calculated as the ratio of unique words to total words. A text where 60% of words are unique has higher lexical diversity than one where only 30% are unique.
| Richness | Interpretation |
|---|---|
| Above 60% | Very rich vocabulary |
| 40%–60% | Normal range for most writing |
| Below 40% | Repetitive — consider varying word choice |
Note: Longer texts naturally have lower vocabulary richness because common words are reused. Compare texts of similar length for meaningful analysis.
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Open Word CounterFrequently Asked Questions
What is a hapax legomenon?
A hapax legomenon is a word that appears only once in a text. The number of hapax legomena (words used once) is another measure of vocabulary diversity — more single-use words suggests richer vocabulary.
Why does vocabulary richness decrease with longer texts?
Longer texts reuse common function words (the, is, and, etc.) more frequently, which reduces the unique-to-total ratio. This is a known statistical property called Heaps' Law.