Most lists of reasons to learn Indonesian would work just as well for Portuguese. Swap the name, keep the sentences: a growing economy, a warm culture, a rewarding challenge. If a reason survives that swap, it is not a reason, it is filler.
Here are six that do not survive it, with the numbers attached, followed by four popular ones that fall apart as soon as you check them.
The first hundred hours pay better than in any comparable language
No tones. No conjugation. No gender. No articles. The same alphabet you are reading now, and words pronounced the way they are spelled.
That combination does not exist anywhere else at this scale. Every other language with a quarter of a billion speakers charges you something up front: a script, a tone system, six verb endings, or noun cases. Indonesian charges you almost nothing, and you can build a real sentence on day one.
Saya mau kopi ‘I want coffee’
Saya tidak mau kopi ‘I don’t want coffee’
Two sentences, no forms to memorise, and the second one is the first one plus a word. The honest version of this argument, including the two places where the language stops being easy, is in how hard Indonesian actually is. The short version: the opening is the cheapest of any major language, and the middle is not.
And the alphabet is not a small mercy. In most languages at this scale, reading is a second course: Mandarin, Arabic, Hindi, Japanese all make you spend months before a street sign means anything. In Indonesian the writing is free from day one, which is why a beginner here gets access to menus, signs, WhatsApp messages and the comments under a video while still being unable to hold a conversation. Reading runs ahead of speaking, and it drags speaking along behind it.
Most speakers learned it the way you are about to
Around 75 million people speak Indonesian as a first language. Around 177 million speak it as a second one. Depending on which estimate you use, the total lands somewhere between 250 and 280 million, and the split matters more than the total.
Three speakers in four grew up in Javanese, Sundanese, Balinese, Batak, Minang or one of several hundred others, and learned Indonesian at school for the same reason you are learning it: to talk to people whose first language was something else.
The practical consequence is the one nobody mentions in a list like this. Everybody has an accent. A Javanese speaker sounds Javanese, a Batak speaker sounds Batak, and nobody treats an accent as a failure of character. You are not walking into a room of native speakers who will hear your foreignness in every vowel. You are joining the majority.
English runs out faster than you expect
In the 2025 EF English Proficiency Index, Indonesia scored 471 and ranked 80th, in the band EF calls low proficiency, against a global average of 488. That index measures people who chose to take EF’s online English test, so it is not a census, and city centres and tourist areas will always feel better than the number suggests.
That is exactly the point. English works in the places built for you, and it thins out fast once you leave them: the neighbourhood warung, the puskesmas waiting room, the person fixing your motorbike, anyone over fifty, and every conversation between two Indonesians standing next to you.
You do not need much to cross that line. Three words do most of the work:
Berapa? ‘how much’
Di mana? ‘where’
Sakit ‘it hurts’
Ordering, asking a price, saying what hurts and understanding the answer is a few weeks of work, and it changes which half of the country you can deal with directly.
One language covers a country of seven hundred
Indonesia has more than seven hundred living languages. Indonesian is the one they agreed on, which means it works in Aceh and in Papua and everywhere between, and it was deliberately kept simple enough for that to be possible.
This is also where the most common mistake about the language gets made. Bahasa just means language. Bahasa Indonesia is Indonesian, bahasa Jawa is Javanese, bahasa Inggris is English. Calling the language “Bahasa” is like calling French “Language”, and Indonesians notice.
Compare that to the arithmetic of learning a regional language first. Javanese has more native speakers than Indonesian does, and it will not help you in Makassar. Balinese is the language people in Ubud speak to each other, and it stops at the ferry. Indonesian is the only key that opens the whole archipelago, and it is also the easiest of the set.
It gets you a long way into Malay
Indonesian and Standard Malay are close relatives with substantial mutual intelligibility, particularly in writing, in the news and in careful speech. Learn one and you can read a Malaysian newspaper, follow a Bruneian announcement and hold a conversation in Singapore.
Two honest caveats, because this claim is usually oversold. Everyday vocabulary diverges more than the formal register does, so a menu or a slang-heavy conversation will trip you, and a few words have drifted far enough apart to be dangerous:
budak is an ordinary word for a kid in Malaysia. In Indonesian it means slave.
bisa is your everyday ‘can’ in Indonesian, and venom in Malaysia, where
boleh does the job instead. Indonesian keeps the venom sense
too, which is why context does so much work here.
And the totals you see quoted for the two languages combined double-count bilinguals, so treat “300 million speakers” as a slogan rather than a figure.
The country is genuinely large, and it is not a footnote
Indonesia is the world’s fourth most populous country, at roughly 285 million people. It is a G20 member and Southeast Asia’s largest economy. Jakarta is one of the largest urban areas on earth.
I put this reason fifth rather than first on purpose. Country size is the argument every list opens with, and it is the weakest of the six, because it only matters if you have a specific reason to be there: work, family, a business, a visa. If you do, it matters a great deal. If you do not, the first four reasons are the ones that will actually keep you going.
Four reasons that do not survive a second look
“It became an official UN language.” It did not. On 20 November 2023, UNESCO’s General Conference adopted Indonesian as its tenth official language. That is one body’s plenary proceedings, not the United Nations, and the claim gets inflated every time it is repeated. The accurate version is still notable. The inflated one is the kind of thing you should stop repeating before an Indonesian corrects you.
“It is easy.” It is easy for about six weeks. Then you meet the affix system, where a single root grows into a dozen words through me-, ber-, di-, ter-, -kan and -i, and the affix lesson exists because that is where people stop. The grammar overview shows how much of the rest is genuinely simple, and exactly where it stops being so. Anyone selling you Indonesian on ease alone has not got that far.
“To experience the culture.” This one is not wrong, it is empty. It would read identically under any other language. If culture is your reason, name the thing: you want to follow the dialogue in Gadis Kretek without subtitles, you want to understand what your in-laws say to each other at dinner, you want to read the comments under an Indonesian video. Those are reasons. “The culture” is a sentence shape.
“To impress people in Bali.” You will impress people in Bali, and it is a poor foundation. Novelty fades in a week, and Balinese speak Balinese to each other anyway, so the compliment you get for saying terima kasih is politeness rather than progress. Learn it to be understood, not to be congratulated. The compliments will come regardless, usually right up until you say something correct and get answered in English.
Where to start
If one of the six landed, the fastest useful hour is the greetings lesson, which gets you through the first thirty seconds of any encounter, followed by saying no properly, which is where beginners give themselves away.
If you would rather find out where you already stand, the level test is twenty questions and six minutes, and it ends by explaining every answer you missed.