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Both calculators run independently — change the inputs on either side to compare results.

Lexical Diversity Index Calculator

Measures the richness of vocabulary in a text by calculating the Type-Token Ratio (TTR). Use it when analyzing essays, transcripts, or language samples for linguistic research or readability assessment.

Unique Words (Types) (types)

Total Words (Tokens) (tokens)

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Language

Language Learning Time Calculator

Estimate how many weeks of language study you need to reach fluency in a target language, based on difficulty class, current level, weekly study hours, and study efficiency. Anchored on US Foreign Service Institute (FSI) hour estimates for native-English-speaker learning.

Target Language Difficulty

Current Level

Study Hours per Week (hours)

Learning Method

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Key differences

	Lexical Diversity Index Calculator	Language Learning Time Calculator
Category	Language	Language
Inputs required	2	4
Result	Lexical Diversity (%)	Estimated Time to Fluency (weeks)
What it does	Measures the richness of vocabulary in a text by calculating the Type-Token Ratio (TTR). Use it when analyzing essays, transcripts, or language samples for linguistic research or readability assessment.	Estimate how many weeks of language study you need to reach fluency in a target language, based on difficulty class, current level, weekly study hours, and study efficiency. Anchored on US Foreign Service Institute (FSI) hour estimates for native-English-speaker learning.