When does vingt or cent take an -s?

Quatre-vingts and multiples of cent take a final -s when they end the number, as in quatre-vingts or deux cents. They lose the -s when another number follows, giving quatre-vingt-un and deux cent un.

How is 'et' used in French numbers?

The word et joins a multiple of ten to un and to onze in the seventies, so 21 is vingt et un and 71 is soixante et onze. It is not used elsewhere, so 22 is vingt-deux and 81 is quatre-vingt-un with no et.

Are French numbers hyphenated?

Under the 1990 spelling reform, all components of a written number are joined by hyphens, for example trois-cent-vingt-et-un. The tool uses this modern hyphenation by default.

How are euros and centimes pluralised?

Euro and centime take an -s when the count is two or more, and stay singular for un euro and un centime. Exactly one euro with no cents reads as un euro, while 0.50 reads as cinquante centimes.

What does the milliard toggle do?

French uses the long scale where milliard means a thousand million (10^9) and billion means a million million (10^12). The toggle lets you confirm the long-scale wording the tool uses for very large amounts.

French Currency in Words

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The French Currency in Words tool converts a euro amount into its written French form, following the agreement and joining rules that French grammar (and French cheque law) require. It handles the tricky cases — quatre-vingts losing its -s, vingt et un, soixante et onze, plural cents — so the wording is correct for invoices, cheques, and contracts.

How it works

The integer part is decomposed into groups of three digits (units, thousands, millions, milliards) and each group is spelled out:

0–16 have unique names (zéro, un, … seize).
17–19 are dix-sept, dix-huit, dix-neuf; 70–79 use soixante-dix…, 90–99 use quatre-vingt-dix… (standard French, not Belgian septante/nonante).
et join. Inserted only for 21, 31, 41, 51, 61 (vingt et un) and 71 (soixante et onze).
vingt/cent agreement. quatre-vingts and a bare cent-multiple take -s at the end of the number; they drop it when followed by another word. mille is invariable.
Currency words. euro and centime are pluralised for counts ≥ 2; the parts are joined with et when both euros and centimes are present.

Example and notes

1234.56 produces mille deux cent trente-quatre euros et cinquante-six centimes. 80.00 produces quatre-vingts euros. 0.01 produces un centime. The cents value is rounded to two decimals before conversion. The tool spells whole-number euro amounts up to the milliard (10⁹) range; the long-scale toggle documents that milliard = 10⁹, matching French and continental usage rather than the US short scale.