Language Learning Calculators
Free language learning calculators: time to fluency by language, vocabulary size estimator, daily study plan, and progress tools.
Anki Daily Review Load Calculator
Estimate how many daily Anki reviews to expect once your deck matures. Based on new cards per day and target retention rate.
CEFR Language Level Hours Calculator
Estimate study hours to reach each CEFR level (A1-C2). Adjust for language difficulty (FSI), study quality, and immersion to find time-to-fluency targets.
Spaced Repetition Review Schedule Calculator
Calculate spaced repetition review intervals for vocabulary cards. Get next review dates and forecast cards due over weeks for Anki-style SRS planning.
FSI Language Difficulty Calculator
Calculate weeks and years to reach professional fluency in any language based on FSI data. Categories range from 600 to 2,200 hours from English.
Language Immersion Planner
Calculate daily immersion hours needed to reach fluency by your target date. Enter goal language, current level, and deadline to get a daily schedule.
Vocabulary Coverage Calculator
Estimate reading comprehension from vocabulary size using lexical frequency research. See your percentage and how many unknown words appear per page of text.
Comprehensible Input Calculator
Calculate how many hours of comprehensible input you need to reach fluency. Based on i+1 theory and real acquisition research.
Study Hours to Fluency Calculator
Calculate how long it will take to reach fluency in a foreign language. Based on FSI difficulty ratings and your daily study hours.
Vocabulary Size Estimate Calculator
Estimate your vocabulary size in a foreign language from a simple test score. Compare your word count to conversational, fluent, and native benchmarks.