Language Learning Time Calculator — How Long to Learn a Language?

Where these estimates come from

The US Foreign Service Institute (FSI) has trained American diplomats in languages for over 70 years, and publishes how many classroom hours its students typically need to reach "professional working proficiency" — comfortable, accurate use of the language in demanding work settings. Languages close to English (Spanish, French, Dutch) take roughly 600–750 class hours; the hardest for English speakers (Arabic, Mandarin, Japanese, Korean) take around 2,200.

FSI students study intensively with teachers, so treat the hours as focused learning time — active lessons, deliberate practice and real conversation — not passive app-tapping or half-watched shows. Casual exposure helps, but it counts for much less per hour.

How to hit your hours faster

The two highest-impact accelerators are consistency and speaking early. An hour a day beats seven hours on Sunday, and regular 1-on-1 conversation practice forces the recall that makes vocabulary stick. This is exactly what language tutoring marketplaces are built for — conversation practice on Preply, italki or Cambly runs roughly $10–25 per hour, so even two sessions a week is one of the cheapest forms of live teaching you can buy.

How the numbers are worked out

Each language uses the FSI category benchmark: ~700 hours (Category I, e.g. Spanish, French), ~900 hours (Category II, e.g. German, Indonesian), ~1,100 hours (Category III, e.g. Russian, Hindi, Thai), or ~2,200 hours (Category IV, e.g. Arabic, Mandarin, Japanese, Korean).
The FSI figure targets professional working proficiency (roughly C1). For lower targets we scale it: basic conversation ≈ 35% of the hours, independent/confident use (≈ B2) ≈ 70%.
Timeline = remaining hours ÷ your weekly study hours, shown in months (4.35 weeks per month).
If you already have some ability, the calculator subtracts a share of the hours for your current level.
These are planning estimates for English speakers — motivation, method and immersion can move them a lot in either direction.

Frequently asked questions

What language is easiest for English speakers to learn?

FSI Category I languages are the quickest: Spanish, French, Italian, Portuguese, Dutch, Swedish, Norwegian, Danish and Romanian, at roughly 600–750 classroom hours to professional working proficiency. Of these, Spanish is the most popular choice thanks to its regular pronunciation and abundant learning resources.

Can I really learn a language in 3 months?

You can reach useful basic conversation in an easy (Category I) language in 3 months if you put in serious daily hours — the math works out to roughly 2 hours a day. Professional-level fluency in 3 months is not realistic for any language. Beware of courses promising it.

How many hours a week should I study?

Five to ten focused hours a week is the sweet spot for most self-funded learners — enough to make visible monthly progress without burning out. Below about 3 hours a week, forgetting tends to cancel much of your progress, and timelines stretch dramatically.

Do 1-on-1 lessons actually speed things up?

Yes — speaking practice with correction is consistently one of the fastest ways to convert study into usable ability, because it forces active recall and fixes errors before they fossilise. It's also cheap in language learning: conversation-focused tutors on the big marketplaces charge roughly $10–25 per hour.

What counts as "fluent"?

There's no single line. The FSI benchmark used here — professional working proficiency (ILR 3, roughly C1) — means handling complex work conversations accurately. Many learners are perfectly happy at B1/B2: conversational comfort in everyday situations, which arrives in roughly a third to two-thirds of the FSI hours.