How to count in Esperanto

Enter a number and read it spelled out 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 (eg.: dudek kvin [25], kvardek ses [46]).
  • The hundreds are built exactly the same way as the tens (eg.: cent [100], ducent [200], tricent [300]…), as well as the thousands (eg.: 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).

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

Other supported languages

List of supported languages ordered by languages families
The other currently supported languages are: