Why is the amount written as one long word?

Finnish writes numbers below a million as a single closed compound, so 234 is kaksisataakolmekymmentäneljä with no spaces. Spaces appear only around the scale words tuhat (thousand) and miljoona (million), which is standard Finnish orthography.

What is the partitive case used for here?

After any cardinal number other than exactly one, the counted noun takes the partitive case: 1 euro but 2 euroa, 1 sentti but 56 senttiä. The tool applies euroa and senttiä automatically unless the count is exactly one.

How are the cents formed?

The fractional part is rounded to two decimal places as the cent count and spelled out in full Finnish words, then suffixed with senttiä (or sentti for exactly one). The euros and cents are joined with the word ja (and).

How do I write the leading one in hundreds and thousands?

Finnish drops the multiplier one before the scale word, so 100 is sata not yksisata and 1000 is tuhat not yksituhatta. The tool follows this rule while still saying yksi euro for a single euro.

Is my amount sent to a server?

No. The number-to-words logic is bundled into the page and runs entirely in your browser, so confidential figures never leave your device. Nothing about the amount you type is uploaded.

Finnish Currency in Words

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The Finnish Currency in Words tool converts a euro amount into its written Finnish form, the way it would appear on an invoice, contract, or cheque. Finnish has its own conventions: the decimal separator is a comma, numbers below a million are written as one long closed compound word, and the counted unit takes the partitive case after any number other than exactly one.

How it works

The euro part is converted with a recursive rule set. Units 0–9 are looked up directly; 11–19 use the suffix -toista (13 = kolmetoista); tens use the combining form -kymmentä with the trailing unit appended (34 = kolmekymmentäneljä). Hundreds use -sataa (200 = kaksisataa, 100 = sata), and the thousands group uses tuhatta (or tuhat for exactly one thousand). The multiplier yksi is dropped before sata and tuhat.

The partitive rule

Finnish marks the counted noun with the partitive case for any amount other than exactly one. So you write yksi euro but kaksi euroa, and yksi sentti but 56 senttiä. The tool joins the euros and cents with ja:

1 234,56 €  →  tuhat kaksisataakolmekymmentäneljä euroa ja viisikymmentäkuusi senttiä

Tips and notes

Enter the amount with a comma for the decimal, as in 1234,56; spaces and the euro sign are ignored.
A single euro reads as yksi euro and a single cent as yksi sentti, keeping the grammar correct at the edges.
The closed-compound rule means there are no spaces inside numbers below a thousand; spaces only frame the scale words tuhat and miljoona.