How long does it take to learn Esperanto?
There is no official figure. The US diplomats' language school, whose week counts are the usual answer for Spanish or French, does not rate Esperanto at all. The best measured evidence is smaller: in an American university's three-week intensive summer programme, some complete beginners reached the ACTFL "Intermediate" rating, which is roughly A2. The claim that Esperanto is four or five times faster than other languages has some support, mostly for reading and listening, and little for the top of the scale. A course that goes all the way from A1 to C2 comes to 889 lessons, which is about two and a half years at one lesson a day.
Why there is no FSI number for Esperanto
The Foreign Service Institute (FSI) publishes timelines only for the languages it teaches diplomats, from 24 weeks for Italian to 88 for Mandarin. Esperanto is not the language of any country's government, so it is not on the list, and any article that gives it an "FSI category" made that category up. The FSI figures for other languages are compared in the easiest languages to learn, which also covers where Esperanto's vocabulary curve falls.
That leaves three kinds of evidence: classroom studies, Esperanto's own exam system, and the arithmetic of a course written to the end.
Where "four or five times faster" comes from
The figure is repeated everywhere and is rarely traced back. These are the sources we could reach, and what each one measured:
| Claim | Who makes it | What it rests on |
|---|---|---|
| "At least four times easier" | Esperanto-USA, an advocacy group | Reasoning from the grammar, plus two anecdotes: a friend who said she learned as much Esperanto in six weeks as Spanish in six months, and the author's own experience. No measurement. |
| "Four or five times as fast", with "some evidence" | Duncan Charters, a language professor, in a 2015 journal article | His own classes: beginners tested by an ACTFL interviewer after a three-week intensive at San Francisco State, some reaching Intermediate, and similar results over two years at the School for International Training. |
| Six times easier than French or German | Norman Williams, writing about a school experiment in 1965, as Wikipedia summarises him | Secondary-school pupils. A 2018 review notes that Williams himself called his conclusions impressionistic. |
| Readable in two hours | Leo Tolstoy, as Charters reports it | Tolstoy said he learned to read Esperanto texts in two hours, and elsewhere three to four, on his own from the text he had been sent. One reader, and reading only. |
Charters, who teaches Esperanto himself, also sets the limit: reaching the level of a C2 speaker "is by no means a routine achievement for the average speaker of Esperanto", and many stop in the B range. So the speed-up applies to the start of the course much more than to the finish.
The springboard studies: Paderborn and Springboard to Languages
A second set of claims is about what Esperanto does for the language you learn next. Some of them are about time saved.
The Paderborn experiment. In the account given on Wikipedia, which cites a report by Helmar Frank of the University of Paderborn that we could not get hold of, two groups of German-speaking primary pupils were compared. One learned English from the third year of school. The other learned Esperanto first, 160 hours over two years, and started English two years later. By the seventh year the two groups' English was level, and by the eighth the Esperanto group was ahead. We could not check the sample size, the tests or how the groups were chosen, so this is the claim as reported, not a finding we can vouch for.
Older British studies. Fisher (1921) and Halloran (1952) reported that children who learned Esperanto for one year and then French for four did better than children who did five years of French. A 2018 review by Karen Roehr-Brackin and Angela Tellier at the University of Essex says that early studies like these often had unclear aims, brief or anecdotal reporting, and experimental and control groups that were not always comparable.
Springboard to Languages (England, 2006 to 2011). This was a five-year evaluation in primary schools, run by the University of Manchester. Children who learned Esperanto did well on tasks that asked them to make sense of unfamiliar languages. However, the summary report says the design "does not allow for conclusions" as to whether another language, taught the same way, would have given the same result.
The controlled studies that followed. Roehr-Brackin and Tellier then ran three studies with matched comparison groups, and these give the most direct timing evidence there is. In one, 28 children aged 8 to 9 were split at random: 14 learned Esperanto and 14 learned French, from the same specialist teacher, for 45 minutes a week over a school year (22.5 hours in all). Proficiency rose by 45% in the Esperanto group and by 14% in the French group. But across all three studies, that head start did not turn into measurably better results in the next language, and it did not help children with low language aptitude. Their conclusion: Esperanto "may be easier to learn" than another European language, but there is no evidence yet that it is the better starter language.
In short, Esperanto is faster to learn in its own right, and the measured part of that is a small beginners' study. The claim that it saves you time on your next language has not survived a controlled comparison so far.
Esperanto's own exams: KER, from B1 to C2
The Universal Esperanto Association (UEA) runs exams aligned to the Common European Framework of Reference (CEFR), which Esperantists abbreviate to KER. They started in December 2008 with the state language-exam centre in Budapest, and UEA has run them alone since 2021. They test speaking, listening to a recording, reading and writing, at B1, B2 and C1, plus a C2 level added in 2022. The pass mark is 60% at every level.
The exam pages describe what each level requires but publish no estimate of study hours, and we found none anywhere else. What they do publish is how many certificates have been awarded: 2,888 by December 2025, of which 864 were at B1, 849 at B2, 1,106 at C1 and 69 at C2. That is evidence that people really do reach C1 and C2 in Esperanto. It says nothing about how long they took.
What a complete course to C2 adds up to
Without an official figure, the most concrete number we can give is our own. The Esperanto course on Verbavia (our own course) is written by hand all the way to the end of C2: 889 lessons, from Saluton! in the first, every one written out in full. You choose how long each lesson is. At Complete, one lesson covers one grammar point. Balanced spreads each point over two shorter lessons, and Essentials over three. At one lesson a day, each level is reached after:
| Level finished | Lessons in total | Complete (20 to 30 min) | Balanced (15 to 20 min) | Essentials (8 to 12 min) |
|---|---|---|---|---|
| A1 | 98 | 98 days | 196 days | 294 days |
| A2 | 188 | 188 days | 376 days | 564 days |
| B1 | 318 | 318 days | 636 days | 954 days |
| B2 | 488 | 488 days | 976 days | 1,464 days |
| C1 | 688 | 688 days | 1,376 days | 2,064 days |
| C2 | 889 | 889 days | 1,778 days | 2,667 days |
At Complete that is about two years and five months to C2, or roughly 300 to 445 hours of lessons going by the lesson lengths above. Shorter lessons do not cut the total much: Essentials comes to about 355 to 535 hours, spread over more than seven years. What a shorter lesson buys you is a smaller daily commitment, not a shorter course. These are hours spent on the course, not a measure of what any one learner will reach. What goes into each lesson is in what is in a lesson.
Where the time actually goes
A constructed language makes some parts of the job much faster and leaves others as long as ever.
What is fast: the grammar, and building words. Every verb uses the same six endings, which do not change for person or number, so grammar takes a small share of the time. Where the time really shrinks is word building. Of the 7,400 words on our Esperanto word list, 215 are simply mal- added to another word on the same list: varma and malvarma (warm, cold), sana and malsana (healthy, ill), fermi and malfermi (to close, to open). A frequency list gives each of them its own row, but the second word costs you little more than learning the prefix once. Endings work the same way. Strip them off and only 933 stems cover 80% of film and television dialogue, against 2,275 separate word forms. How that count was made, and why it is not a fair comparison with other languages, is in how many words you need for Esperanto.
What is not fast: roots, and hearing the language. A root has to be learned like a word in any other language, and you still need 2,967 stems to reach 90%. Listening is the scarce part. Esperanto has no country and no television industry, so there is far less to hear. Even counting subtitles, which are text and often translated, the OpenSubtitles corpus has 403,882 words of Esperanto against 423 million of Spanish. Charters names the other gap: intermediate and advanced courses are rarely offered, so "only the most dedicated learners" reach a near-native level. This is why the middle and end of an Esperanto course feel less like a sprint than the first months do. Whether that makes the language hard is a separate question, answered in is Esperanto hard to learn.
So how long?
- The grammar: early. It is small enough to be learned in the first months, which is where most of the speed-up comes from.
- To hold a basic conversation (around A2): one intensive three-week course was enough for some of Charters' beginners. At one Complete lesson a day, A2 ends at lesson 188, about six months in.
- To C1 or C2: about two to two and a half years of daily lessons. Roots and listening are what take the time, not grammar.
To see where you stand now, the two-minute Esperanto vocabulary test estimates your vocabulary size, and the Esperanto course starts at the first word of the list. The same question for a natural language looks very different. Compare how long it takes to learn Spanish.
Sources
- Charters, D. (2015). The teaching and learning of Esperanto. Interdisciplinary Description of Complex Systems 13(2), 288–298. indecs.eu
- Roehr-Brackin, K. & Tellier, A. (2018). Esperanto as a tool in classroom foreign language learning in England. Language Problems and Language Planning 42(1), 89–111. Accepted version: repository.essex.ac.uk
- Roehr, K. The Springboard to Languages evaluation project: a summary report (of the University of Manchester evaluation by A. Barton and J. Bragg, 2006–2011). repository.essex.ac.uk
- Esperanto-USA. Is Esperanto four times easier to learn? Archived 2013. web.archive.org
- Paderborn method, the account of Helmar Frank's experiment, including the 160 hours. en.wikipedia.org
- UEA-KER exams: history, levels and certificate counts (edukado.net), and the description of each paper and the 60% pass mark (edukado.net).
- Foreign Service Institute, National Foreign Affairs Training Center: language learning timelines, checked 2026-09-25 (Esperanto does not appear).
- Lison, P. & Tiedemann, J. (2016). OpenSubtitles2016: Extracting Large Parallel Corpora from Movie and TV Subtitles. Proceedings of LREC 2016. aclanthology.org
- Dave, H. FrequencyWords: frequency lists from OpenSubtitles 2018, content licensed CC BY-SA 4.0. github.com. The coverage figures and the stem count are computed by
scripts/frequency_curves.pyand printed from its output rather than typed. - The course figures (lessons, level boundaries, lesson lengths and the word list) come from Verbavia's own course files.