Why is 21 written as einundzwanzig?

German puts the unit before the ten and joins them with und, so 21 is "ein-und-zwanzig" (one-and-twenty). Numbers below a million are written as one long word.

How large a number can I convert?

Up to 12 digits in the integer part, covering values into the billions (Milliarden). Million and Milliarde are written as separate words and pluralised correctly.

Why are German numbers written as one long word?

German writes everything below a million as a single concatenated word — for example dreihundertfünfundvierzig for 345. The scale words Million and Milliarde stand as separate words.

Why is 1 sometimes ein and sometimes eins?

On its own the number 1 is eins, but inside a compound it becomes ein — so 21 is einundzwanzig and 100 is einhundert, not einshundert.

Is anything sent to a server?

No. The conversion runs entirely in your browser — no number you type ever leaves your device.

Number to Words in German

This tool spells any whole number into German words. German has a distinctive units-before-tens word order, which the converter handles for you. It runs entirely in your browser.

How it works

Within each three-digit group German spells the hundreds, then the unit before the ten joined by und — so 21 is ein-und-zwanzig (one-and-twenty). Everything below a million is written as a single concatenated word, such as dreihundertfünfundvierzig (345). Above that, Million and Milliarde are separate words and are pluralised (Millionen, Milliarden) when there is more than one.

Example

The number 345 is built right-to-left within the hundreds group:

Part	German
300	dreihundert
5 (unit, first)	fünf
und 40	undvierzig

Concatenated: dreihundertfünfundvierzig. Likewise 1,234 is eintausendzweihundertvierunddreißig.

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