How are Dutch syllables counted?

Each maximal run of vowel letters is treated as one syllable nucleus. Long vowels (maan), and digraphs and diphthongs (boom, huis, oe, ui) are single sounds, so they count once. This vowel-group method matches how Dutch syllables are formed in spelling.

What about words like ideeën or geïnd?

A trema (ë, ï, ö, ü) marks that a vowel begins a new syllable, breaking what would otherwise look like one vowel group. The counter adds a syllable at each trema, so ideeën counts as three (i-dee-en) and geïnd as two (ge-ind).

It is accurate for the large majority of native Dutch words. A few loanwords and unusual vowel hiatus cases without a trema can be off by one, so treat the count as a strong estimate for rare words and verify if precision is critical.

No. All counting happens locally in your browser. Nothing is sent to a server, so it is safe for drafts and private documents.

Dutch Syllable Counter

Q: Does the open and closed syllable rule matter here?

It is the cause of the patterns, not a separate step. A long vowel is written single in an open syllable (ma-nen) and doubled in a closed one (maan), but either way it is one vowel group, so counting vowel groups captures both.

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This tool counts the syllables in Dutch words and passages. Dutch spelling encodes syllable structure quite directly through its vowel groups, so a vowel-group counter is both simple and accurate for most words, with one important refinement for the trema.

How it works

The counter scans each word and counts the maximal runs of vowel letters. A run of vowels is normally a single syllable nucleus, which means long vowels and digraphs collapse to one count:

maan  -> 1   (one vowel group: aa)
boom  -> 1   (oo)
huis  -> 1   (ui)
water -> 2   (a | e)

The one exception is the trema. In Dutch a trema on ë ï ö ü signals that the vowel starts a new syllable, breaking the vowel group:

ideeën -> 3   (i-dee-en, the ë opens a syllable)
geïnd  -> 2   (ge-ind)

The doubling rule the description mentions — a long vowel written single in an open syllable (ma-nen) and doubled in a closed one (maan) — is exactly what produces these vowel groups, so counting vowel groups handles it automatically.

Tips and notes

Hyphenated compounds are split and each part counted, so auto-ongeluk sums its parts. The method is reliable for native vocabulary; rare loanwords with hidden vowel hiatus (no trema) may read one syllable short, so double-check unusual words when exact counts matter, for example in poetry or song lyrics.