Language Learning Time Calculator (FSI Hours)

How it works

Hours = FSI category hours (I 700, II 900, III 1,100, IV 2,200 to professional proficiency) × level share (A2 25%, B1 45%, B2 75%, C1 100%) × study-mode factor × prior-language factor × age factor; weeks = hours ÷ weekly hours

The US Foreign Service Institute has taught diplomats languages for decades and publishes how many classroom hours its students — motivated adults studying full-time with excellent teachers — need to reach professional working proficiency: roughly 600–750 for languages close to English such as Spanish and French, 900 for German, 1,100 for Russian or Hindi, and 2,200 for Arabic, Mandarin, Japanese and Korean, which combine unrelated grammar with demanding writing systems. Most learners aim lower than professional proficiency and study less efficiently than at FSI, so the estimate scales the hours by target level and by how you study: self-study with apps is slower per hour than tutored classes, immersion faster. Prior languages and age nudge it further. The hours are what matter — the calendar follows from how many of them you can honestly fit each week.

Worked example

Russian (Category III, 1,100 h) to B2 (75%) with a tutor plus self-study (×1.3) as a first foreign language: about 1,070 focused hours — 153 weeks, or just under three years, at 7 hours a week. Spanish on the same plan would take roughly 680 hours, Mandarin about 2,150.

Frequently asked questions