How to count in Esperanto

Enter a number and get it written in full in Esperanto.

Language overview

Esperanto is a constructed international auxiliary language. Invented by Dr. Ludwik Łazarz Zamenhof in 1887, it counts about 100,000 very active speakers, 2 million fluent speakers and one thousand native speakers. Mostly based on European languages (French, German, Polish and Russian), it is written with a modified version of the Latin alphabet, and is very regular in its forms.

Esperanto numbering rules

  • Digits from zero to nine are specific words, namely nul [0], unu [1], du [2], tri [3], kvar [4], kvin [5], ses [6], sep [7], ok [8], and naŭ [9].
  • The tens are formed by adding the ten word (dek) after the matching digit, with the exception of ten where the unit is implicit: dek [10], dudek [20], tridek [30], kvardek [40], kvindek [50], sesdek [60], sepdek [70], okdek [80], and naŭdek [90].
  • Numbers from twenty-one to ninety-one are constructed by saying the ten first, followed by the digit separated with a space (e.g.: dudek kvin [25], kvardek ses [46]).
  • The hundreds are built exactly the same way as the tens (e.g.: cent [100], ducent [200], tricent [300]…), as well as the thousands (e.g.: mil [1,000], dumil [2,000], trimil [3,000]…).
  • The Esperanto language follows the long scale system for naming big numbers: every new word greater than a million is one million times bigger than the previous term. Thus, miliardo is equivalent to 109 (one billion in the US), a trillion (1012) is said duiliono (the biliono word is no longer used due to its ambiguity).

Books

A Complete Grammar Of Esperanto The International LanguageA Complete Grammar Of Esperanto The International Language
by Ivy Kellerman, editors BiblioBazaar (2009)
[ Amazon.com]

L’Espéranto de pocheL’Espéranto de poche
by Klaus Dahmann, Thomas Pusch, editors Assimil (2009)
[ Fnac.com]

Parlons Espéranto, la langue internationaleParlons Espéranto, la langue internationale
by Jacques Joguin, editors L’Harmattan (2001)
[ Fnac.com]

Numbers list

1 – unu
2 – du
3 – tri
4 – kvar
5 – kvin
6 – ses
7 – sep
8 – ok
9 – naŭ
10 – dek
11 – dek unu
12 – dek du
13 – dek tri
14 – dek kvar
15 – dek kvin
16 – dek ses
17 – dek sep
18 – dek ok
19 – dek naŭ
20 – dudek
30 – tridek
40 – kvardek
50 – kvindek
60 – sesdek
70 – sepdek
80 – okdek
90 – naŭdek
100 – cent
1,000 – mil
one million – miliono
one billion – miliardo
one trillion – unu duiliono

Auxiliary languages

Esperanto, Ido, Solresol, and Volapük.

Other supported languages

Supported languages by families
As the other currently supported languages are too numerous to list extensively here, please select a language from the following select box, or from the full list of supported languages.