Finnish numerals
Numbers in Finnish are highly systematic, but can be irregular.
Cardinal numbers
The ordinary counting numbers from 0 to 10 are given in the table below. Cardinal numbers may be inflected and some of the inflected forms are irregular in form.| Number | Nominative | Genitive | Partitive | Illative |
| 0 | nolla | nollan | nollaa | nollaan |
| 1 | yksi | yhden | yhtä | yhteen |
| 2 | kaksi | kahden | kahta | kahteen |
| 3 | kolme | kolmen | kolmea | kolmeen |
| 4 | neljä | neljän | neljää | neljään |
| 5 | viisi | viiden | viittä | viiteen |
| 6 | kuusi | kuuden | kuutta | kuuteen |
| 7 | seitsemän | seitsemän | seitsemää | seitsemään |
| 8 | kahdeksan | kahdeksan | kahdeksaa | kahdeksaan |
| 9 | yhdeksän | yhdeksän | yhdeksää | yhdeksään |
| 10 | kymmenen | kymmenen | kymmentä | kymmeneen |
sometimes abbreviated as seiska
sometimes seitsentä
sometimes abbreviated as kasi
sometimes abbreviated as ysi
Teens and multiples of ten
To form teens, toista is added to the base number. Toista is the partitive form of toinen, meaning "second group of ten". Hyphens are written here to separate morphemes. In Finnish text, hyphens are not written.- yksi-toista, kaksi-toista, … yhdeksän-toista
- kaksi-kymmentä, yksi-kolmatta, kaksi-kolmatta, … yhdeksän-kolmatta
- yksi-neljättä, yksi-viidettä
The numbers for tens are constructed this way:
- kaksi-kymmentä, kolme-kymmentä, neljä-kymmentä, … yhdeksän-kymmentä
- kaksi-kymmentä yksi, kaksi-kymmentä kaksi, kaksi-kymmentä kolme
Hundreds
1000 is tuhat, 2000 is kaksituhatta and so on.
So, 3721 is kolme-tuhatta-seitsemän-sataa-kaksi-kymmentä-yksi.
Years
In older Finnish, years were expressed by counting centuries. Use of this convention is archaic. For instance, yhdeksäntoistasataa kaksikymmentäkaksi "1922", instead of the modern tuhatyhdeksänsataa kaksikymmentäkaksi.Long numbers are separated in three-digit sections with space beginning from the end of the number. Writing it with letters follow the spacing, in the example kolme-kymmentä-kaksi miljoonaa viisi-sataa-kolme-kymmentä-neljä-tuhatta seitsemän-sataa-viisi-kymmentä-kuusi.
Inflection
Numbers can be inflected by case; all parts of the number except toista are inflected.Nouns following a number in the nominative singular are usually in the singular partitive case, if the noun does not need to be in any other case and if the number is any number other than yksi "one".
If the number is yksi "one" and it is in the nominative singular then the noun and any adjectives following it will also be in the singular nominative.
But if the noun is in a case besides the nominative, the number and any adjectives following it will be in the same case. For example:
| Finnish | English |
| yksi päivä | one day |
| kaksi päivää | two days |
| kahtena päivänä | on/during two days |
| kahdessatoista maassa | in twelve countries |
| kolmellekymmenelleviidelle hengelle | for thirty-five persons |
Sets
Numerals also have plural forms, which usually refer to things naturally occurring in pairs or other similarly well-defined sets, such as body parts and clothing items. Also names of celebrations are usually in the plural. The plural forms are inflected in cases in the same way as the corresponding nouns. For instance:| Finnish | English |
| kahdet saappaat | two pairs of boots |
| kolmissa jalanjäljissä | in three sets of footprints |
| Neljät häät ja yhdet hautajaiset | Four Weddings and a Funeral |
Numbers from one to seven are apparently original in etymology. The words kahdeksan "eight" and yhdeksän "nine" have no confirmed etymology. The old theory is that they are compounds: *kaks-teksa "10–2", or "eight" and *yks-teksa "10–1", or "nine", where the reconstructed word *teksa is similar to the Indo-European words for "ten", but this is phonologically not plausible. Alternatively, they could be *kakt-e-ksä and ykt-e-ksä "itself, without two" and "without one", where -eksa is a form of ei "no" inflected with the Karelian reflexive conjugation.
Ordinal numbers
These are the 'ordering' form of the numbers: "first, second, third", and so on. Ordinal numbers are generally formed by adding an -s ending, but first and second are completely different, and for the others the stems are not straightforward:| Finnish | English |
| ensimmäinen | first |
| toinen | second |
| kolmas | third |
| neljäs | fourth |
| viides | fifth |
| kuudes | sixth |
| seitsemäs | seventh |
| kahdeksas | eighth |
| yhdeksäs | ninth |
| kymmenes | tenth |
For teens, the first part of the word is changed; however, the words for "first" and "second" lose their irregularity in "eleven" and "twelve":
For twenty through ninety-nine, all parts of the number get the '-s' ending. 'First' and 'second' take the irregular form only at the end of a word. The regular forms are possible for them but they are less common.
100th is sadas, 1000th is tuhannes, 3721st is kolmas-tuhannes-seitsemäs-sadas-kahdes-kymmenes-ensimmäinen. Again, dashes only included here for clarity; the word is properly spelled without them.
Like cardinals, ordinal numbers can also be inflected:
| Finnish | English |
| kolmatta viikkoa | for the third week |
| viidennessätoista kerroksessa | in the fifteenth floor |
| tuhannennelle asiakkaalle | to the thousandth customer |
The toista in the 'teens' is actually the partitive of toinen, which is why toista gets no further inflection endings.
Long ordinal numbers in Finnish are typed in almost the same way as the long cardinal numbers. 32534756 would be kolmas-kymmenes-kahdes miljoonas viides-sadas-kolmas-kymmenes-neljäs-tuhannes seitsemäs-sadas-viides-kymmenes-kuudes.
Names of numbers
This is a feature of Finnish which does not have an exact counterpart in English, but there is a counterpart in colloquial German, for example: 7er, 190er, 205er. These forms are used to refer to the actual number itself, rather than the quantity or order which the number represents. This should be clearer from the examples below, but first here is the list:| Finnish | English |
| nolla | nil, number zero |
| ykkönen | the number one the figure "1" |
| kakkonen | 2 |
| kolmonen | 3 |
| nelonen | 4 |
| viitonen | 5 |
| kuutonen | 6 |
| seitsemän seitsemäinen seitsikko seiska | 7 |
| kahdeksan kahdeksikko kasi | 8 |
| yhdeksän yhdeksikkö ysi | 9 |
| kymmenen kymppi | number ten |
Also, kahdeksikko refers to the shape of the number. Some examples of how these are used: