Icelandic Numbers

Icelandic Flag

How to count in Icelandic

Numbers in Icelandic are incredibly complex. For correct usage of numbers see below.

1. Einn

2. Tveir

3. Þrír

4. Fjórir

5. Fimm

6. Sex

7. Sjö

8. Átta

9. Níu

10. Tíu

11. Ellefu

12. Tólf

13. Þréttán

14. Fjórtán

15. Fimmtán

16. Sextán

17. Sautján

18. Átján

19. Nítján

20. Tuttugu

21. Tuttugu og einn

30. Þrjátíu

40. Fjörutíu

50. Fimmtíu

60. Sextíu

70. Sjötíu

80. Áttatíu

90. Níutíu

100. Hundrað

101. Hundrað og einn

1000. Þúsund

1000000. Milljón

Declensions of Icelandic Numbers

Icelandic numbers are rather erratic. The first problem encountered is the fact that the numbers 1 through 4 are declined in both gender, case and in some instances singular and plural. The tables below show the declension and then gives an explanation of how to use them.

singular masculine feminine neuter
nominative einn ein eitt
accusative einn eina eitt
dative einnum einni einu
genitive eins einnar eins
plural masculine feminine neuter
nominative einir einar ein
accusative eina einar ein
dative einum einum einum
genitive einna einna einna
singular masculine feminine neuter
nominative tveir tvær  tvö 
accusative tvo tvær  tvö 
dative tveimur tveimur tveimur
genitive tveggja tveggja tveggja
singular masculine feminine neuter
nominative þrír  þrjár  þrjú 
accusative þrjá  þrjár  þrjú 
dative þremur  þremur  þremur 
genitive þriggja  þriggja  þriggja 
singular masculine feminine neuter
nominative fjórir  fjórar  fjögur 
accusative fjóra  fjórar  fjögur 
dative fjórum  fjórum  fjórum 
genitive fjögurra  fjögurra  fjögurra 


The plural form of 2, 3 and 4 are tvennir, þrennir and fernir, and they follow the same declension pattern as einir.

Plural numbers are used to count pairs of something, for example, when counting socks, you would say þrenna sokka. If however, there were only one sock, and not a pair, you would use the singular version.

More on Icelandic Numbers

Numbers have to agree with what is being counted. This means that roses would be counted using the feminine version of 1, 2, 3 and 4 because rós is feminine. When reciting numbers use the masculine form.

The numbers hundrað, þúsund and miljón have set genders (neuter, neuter and feminine), so it is important to decline these as plural numbers when using any number after 1 (i.e. tvö þúsund). It is also important to use the correct gender of the numbers 1 - 4 with these numbers.

To make matters worse there can be more than one form of a number in a larger number. For example, hús (house) is neuter. So to say 2031 houses you must use the correct form of 2, 1000 must be plural and 1 must be neuter as it qualifies the noun house. 2031 houses in Icelandic would be tvö þúsund þrjátíu og eitt hús.

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