~900 hours to learn Indonesian
Short answer: A native English speaker needs about 900 class hours (~36 weeks full-time) to reach professional working proficiency in Indonesian, per the US State Department’s FSI (Category II). Casual self-study takes longer.
Category II — tier 2 of 4 by FSI class hours (~900 hrs, full-time classroom)
At a glance
- FSI estimate
- ~900 hrs
- Weeks (full-time)
- 36
- FSI category
- Category II
- Writing system
- Latin
How Indonesian’s hours compare
Bars plot the verbatim FSI class-hour figures on a 2,200-hour (Category IV) scale; a range is drawn at its lower bound.
The Foreign Service Institute estimates that a native English speaker requires approximately 900 hours of classroom instruction over 36 weeks to reach Professional Working Proficiency in Indonesian (ILR Speaking-3 and Reading-3 levels). This represents a moderate time investment compared to more distant languages. Indonesian belongs to the Austronesian language family, which is linguistically distant from English, yet the language benefits from a relatively straightforward Latin-based writing system that presents minimal difficulty for English speakers.
Several factors influence learning speed beyond classroom hours. Indonesian's grammar is considerably simpler than English in many respects, lacking verb conjugations and complex case systems, which can accelerate progress. However, the unfamiliar vocabulary and different sentence structures require sustained effort. These FSI estimates assume full-time, intensive study in a classroom setting. Self-study at a casual pace typically requires substantially more time to achieve equivalent proficiency levels.
What ~900 hours means at 5 hours a week
FSI’s ~900 class hours for Indonesian is a full-time classroom figure. Spread the same hours over a part-time schedule and the calendar looks very different — the rows below are simple division of the FSI number, not a separate FSI estimate:
| Pace | Calendar time to cover the hours |
|---|---|
| 5 hrs/week | ~180 weeks (about 3.5 years) |
| 10 hrs/week | ~90 weeks (about 1.7 years) |
| Full-time classroom (FSI) | ~36 weeks |
An hour of casual self-study is not equivalent to an hour of FSI's intensive classroom instruction, so treat the part-time rows as a floor, not a promise.
Simple division of the verbatim FSI figure (~900 class hours) — arithmetic, not a promise. Casual self-study hours count for less than FSI’s intensive classroom hours, so treat it as a floor.
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- FSI tier
- Category II
- Writing system
- Latin
- Family
- Austronesian (Malayo-Polynesian)
What makes Indonesian easier or harder
FSI difficulty tracks how far a language sits from English. Indonesian is in the Category II tier, written in the Latin script, from the Austronesian (Malayo-Polynesian) family. A closer family and a familiar script generally mean fewer hours; a different script or grammar adds time.
What sets Indonesian apart
Indonesian is one of 5 languages in FSI’s Category II, at about 900 class hours. It keeps the Latin alphabet, shared with 34 other FSI-taught languages — no new script stands between you and the grammar and vocabulary work. It belongs to the Austronesian (Malayo-Polynesian) family, alongside 2 other languages on the list.
Common questions
How many hours does it take to learn Indonesian?
Why is Indonesian rated this way?
How long would Indonesian take at 5 hours a week?
| Measure | Value |
|---|---|
| FSI category | Category II |
| Canonical hours (tier) | ~900 class hours |
| Canonical weeks (tier) | ~36 weeks full-time |
| Languages in this tier | 5 |
Who speaks Indonesian
| Native speakers (L1) | 78.0M (source) |
|---|---|
| Language family | Austronesian (Malayo-Polynesian) |
| Primary regions | Indonesia |
| Writing system | Latin |
Speaker counts, language-family and region data from Wikipedia (Ethnologue figures), licensed CC BY-SA 4.0.
Also curious about
More Category II languages — the same FSI difficulty tier.
Why Indonesian is rated this way → · How to approach learning Indonesian → · See its difficulty tier → · Where Indonesian ranks among all 75 languages →
Hours and weeks are the canonical FSI figures for Category II, from the US State Dept FSI list (public domain), used verbatim and last verified June 2026. How we compile and re-verify this data.