Why is the Finnish number one long word?

Finnish writes whole numbers as a single closed compound: 21 is kaksikymmentäyksi and 247 is kaksisataaneljäkymmentäseitsemän. The tens, hundreds, and thousands parts join with no spaces, which is standard Finnish orthography.

How are the teens formed?

Numbers 11 to 19 are the unit plus toista: yksitoista is 11, kaksitoista is 12, and so on. The word toista comes from an old partitive meaning 'of the second ten', a historical quirk preserved in modern Finnish.

How are tens and hundreds built?

Tens use the unit plus kymmentä, so kaksikymmentä is 20 and kolmekymmentä is 30. Hundreds use sata for 100 and the unit plus sataa above that, so kaksisataa is 200. Thousands use tuhat for 1000 and tuhatta above that.

Does it add the partitive ending on counted nouns?

No. A Finnish cardinal larger than one normally puts the counted noun in the partitive case (kaksi taloa, 'two houses'). This tool spells the number itself; it does not inflect any following noun.

What range does it support?

Whole numbers from 0 up to 999,999,999,999, covering units, tens, hundreds, thousands, millions, and milliards. Negative numbers and decimals are not supported.

Finnish Number to Words

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This tool spells any whole number in Finnish, producing the single closed compound word that Finnish uses for numerals.

How it works

The converter builds the word from the largest scale down. Within each group of three digits it handles hundreds, then tens, then units:

units 0-10  : nolla, yksi, kaksi … kymmenen
11-19       : unit + toista  (yksitoista, kaksitoista …)
20,30…90    : unit + kymmentä (kaksikymmentä …)
100         : sata ;  200…900 : unit + sataa
1000        : tuhat ; n×1000  : prefix + tuhatta
1e6         : miljoona / miljoonaa
1e9         : miljardi / miljardia

All parts join with no spaces, so 247 becomes kaksisataaneljäkymmentäseitsemän. Notice the singular forms sata and tuhat for exactly one hundred and one thousand, versus the partitive plurals sataa and tuhatta when there are several.

Tips and notes

Remember that in real sentences a cardinal above one triggers the partitive case on the counted noun — kaksi kissaa (“two cats”), not kaksi kissa. This tool gives you the number word; add the noun ending yourself. For ranking positions (first, second, third) use the Finnish ordinal-words tool instead.