Finnish Currency in Words

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 the Finnish words are built

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

More conversion examples

Notice how tuhat yksi (1,001) illustrates that the scale word tuhat gets no trailing yks- multiplier but the remainder units are added directly.

Why this matters for legal and financial documents

Finnish contract law and accounting practice follow the same principle that applies in many countries: when an amount appears in a contract, invoice, or deed of transfer, writing it out in words alongside the numeral serves as a safeguard against alteration. If the numeral is changed, the words form acts as a cross-check. Bank-guaranteed cheques, promissory notes, and formal payment instructions in Finnish still use the spelled-out form.

The Finnish tax authority (Vero) and the Finnish financial supervisory authority (Finanssivalvonta) do not mandate a specific words form on ordinary VAT invoices, but many Finnish companies include it by convention on large invoices, especially in construction and real estate.

The building blocks, spelled out

The whole system is generated from a small vocabulary plus a few joining rules. Units and the key combining forms:

Reading kolmekymmentäneljä (34) shows the closed-compound logic: kolme (3) + kymmentä (tens) + neljä (4), run together with no spaces. Only the scale words tuhat and miljoona get spaces around them, which is why 1 234 appears as tuhat kaksisataakolmekymmentäneljä — one space after tuhat, none inside the hundreds group.

The dropped-yksi rule and where it stops

Finnish omits the multiplier yksi directly before sata and tuhat: 100 is sata, not yksisata; 1000 is tuhat, not yksituhatta. But the rule is specifically about those two scale words. So:

• 100 → sata, 1 000 → tuhat (dropped)
• 1 € → yksi euro (kept — no scale word follows)
• 1 000 000 → miljoona (dropped) but 2 000 000 → kaksi miljoonaa
• 21 → kaksikymmentäyksi — the yksi in the units place is always kept

A frequent mistake in hand-written amounts is writing yksisataa for 100; the tool applies the drop automatically so the output matches Kotus guidance.

When the amount is a whole number

If the euro amount has no cents (for example 1,000.00 with zero cents), the tool omits the ja … senttiä suffix — writing just tuhat euroa rather than tuhat euroa ja nolla senttiä. This matches Finnish practice; zero cents are not spelled out.

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.

Sources and references

• Kotus — Institute for the Languages of Finland (numbers and currency) — the authority on Finnish orthography, the closed-compound number rule, and partitive usage
• Kielitoimiston ohjepankki — writing numbers and amounts — the official style guidance for spelling out figures

Maintained by the Gera Tools editorial team. The closed-compound spelling and the partitive case (euroa/senttiä after any number other than one) follow standard Finnish orthography; conversion runs entirely in your browser. Last reviewed 2026-07-02.