Number to Words in Italian

This tool spells any whole number into Italian words (numero in lettere), applying the language’s two classic spelling rules automatically. It runs entirely in your browser.

How it works

Italian numbers below a million are written as a single concatenated word. Two vowel rules keep the spelling correct:

• A tens word drops its final vowel before uno (1) and otto (8) — venti + uno = ventuno, trenta + otto = trentotto.
• tre takes an accent (tré) when it ends a compound number — 23 is ventitré, 43 is quarantatré.

Example

So 1234 spells out as milleduecentotrentaquattro.

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When you need to write numbers in Italian words

Italian law and formal conventions require numbers written in full words in several contexts:

• Cheques (assegni) — the amount must appear in full Italian words
• Legal contracts — sums of money are typically spelled out to prevent tampering or ambiguity
• Formal documents — invoices, notarial acts, and official correspondence often require numbers in lettere alongside digits
• Italian language learning — understanding Italian number spelling is essential for listening comprehension, since spoken numbers follow the same concatenation rules

The concatenation rule in depth

Italian numbers below one million are written as a single word. The construction is additive:

• Start with hundreds: cento (100), duecento (200) … novecento (900)
• Add thousands: mille (1,000), duemila (2,000) — note mille → mila in the plural
• Add hundreds again, then tens (with vowel elision), then units (with accent on tre)

For example, 2,345 is built as:

• duemila (2,000) + trecento (300) + quaranta (40) + cinque (5)
• = duemilatrecentoquarantacinque

And 2,023 is: duemila + venti + tré (with elision: venti drops the final vowel before tre to give venti → venti, but tre takes the accent) = duemilaventitré

The tens + uno/otto elision rule, explained

This rule trips up Italian learners consistently. When a tens word (venti, trenta, quaranta, cinquanta, sessanta, settanta, ottanta, novanta) precedes uno or otto, the tens word drops its final vowel:

Note: ottanta (80) already ends in a, so 81 is ottantuno (dropping the a). The same rule applies across all the tens.

Scale words: milione and miliardo

Above 999, Italian switches to separate words for scale:

• 1,000 = mille (one word combined with what follows)
• 1,000,000 = un milione (separate word; milioni in the plural)
• 1,000,000,000 = un miliardo (separate word; miliardi in the plural)

Note that Italian uses miliardo (10⁹) rather than the English “billion”, which can cause confusion in translation. This converter handles scale words correctly for numbers up to 12 digits.