When does a Dutch noun take -en versus -s?

Most Dutch nouns take -en. The -s ending is used after unstressed endings like -el, -em, -en, -er, and -aar (tafel→tafels), after the diminutive -je (meisje→meisjes), and after a single long vowel where it becomes 's (foto→foto's). The tool checks these patterns first.

Why does kat become katten but maan becomes manen?

Both keep their vowel sound, but spelling differs by syllable. Kat has a short vowel in a closed syllable, so the consonant doubles to keep it closed: katten. Maan has a long vowel written double in a closed syllable, so one vowel drops as -en opens the syllable: manen.

What about words like dag or dak?

These are genuinely ambiguous from spelling alone: dag becomes dagen with a lengthened vowel, while a similar-looking word might double its consonant. The tool shows both possible forms for short-vowel CVC words and flags them so you can pick the lexically correct one.

Does it handle f to v and s to z changes?

Yes. Many Dutch nouns voice a final f to v or s to z before -en, as in brief→brieven, graf→graven, and huis→huizen. The tool applies this voicing and notes it as the rule used.

Are irregular plurals covered?

Common irregulars such as kind→kinderen, stad→steden, koe→koeien, and schip→schepen are looked up directly and flagged as irregular. Dutch has more irregulars than any list can cover, so verify unusual nouns.

Dutch Plural Helper — Gera Tools

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This tool forms the plurals of Dutch nouns using the language’s real spelling rules. Dutch plurals are mostly regular but the spelling changes — consonant doubling, vowel de-doubling, and voicing — catch out learners, so the tool makes each rule explicit.

How it works

The tool first checks the -s cases, then handles the -en cases with their spelling changes. The -s plural applies to diminutives, unstressed endings, and single long vowels:

meisje -> meisjes   (diminutive -je)
tafel  -> tafels    (unstressed -el)
foto   -> foto's    (long vowel ending takes 's)

The -en plural is where spelling shifts. The open and closed syllable rule drives it: a short vowel must stay in a closed syllable, so its consonant doubles; a long vowel written double opens up and loses a letter:

kat   -> katten   (short vowel, consonant doubled)
maan  -> manen    (long vowel de-doubled)
brief -> brieven  (f voiced to v)
huis  -> huizen   (s voiced to z)

For a single short vowel followed by a single consonant, spelling alone cannot decide between doubling (kat→katten) and lengthening (dak→daken), so both forms are shown and flagged.

Tips and notes

Treat flagged ambiguous and irregular results as prompts to verify, not as guesses to trust blindly. Irregular plurals like kind→kinderen and stad→steden are looked up directly. The rule label next to each result tells you exactly which transformation was applied, which is useful when learning the patterns rather than just memorising individual words.