What is the difference between a diphthong and a hiatus?

A diphthong is a vowel cluster pronounced as one syllable because at least one vowel is an unstressed weak vowel i or u, as in pai, céu, and quão. A hiatus is when two vowels split into separate syllables, as in sa-í-da or po-e-ta, usually because both are strong vowels or the weak vowel is stressed. The tool applies these rules when grouping vowel runs.

How does the European Portuguese toggle change the count?

European Portuguese heavily reduces unstressed vowels, and a final unstressed e is often dropped to a near-silent schwa in speech, so noite can sound like one syllable. When the toggle is on, the tool removes that final unstressed -e or -es to approximate the spoken count. Brazilian Portuguese keeps the full written syllable count.

Are nasal vowels like ão and õe counted correctly?

Yes. Nasal diphthongs written with a tilde, such as ão in coração, ãe in mãe, and õe in canções, are treated as a single syllable nucleus, matching how they are pronounced.

Why does an accented í or ú create an extra syllable?

An accent on a weak vowel signals that it carries the stress and forms its own syllable instead of gliding into a diphthong. So saída is sa-í-da (three syllables) and país is pa-ís (two), which the tool reflects by treating stressed í and ú as separate nuclei.

Is this an exact hyphenation dictionary?

No. This is a phonetic heuristic that applies the real diphthong, hiatus, and nasal-cluster rules rather than looking words up in a dictionary. It is accurate for the vast majority of words and ideal for reading-time and readability estimates, but rare lexical exceptions can differ from formal hyphenation.

Portuguese Syllable Counter

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This tool estimates how many syllables a Portuguese passage has by finding each vowel nucleus and applying the language’s diphthong, hiatus, and nasal-vowel rules. Portuguese syllable structure is more regular than English, but the weak-versus-strong vowel distinction makes a naive vowel count wrong for words like saída, país, and mãe.

How it works

Each word is scanned for maximal runs of vowels. Within a run the algorithm decides where one syllable ends and the next begins:

pai     -> p[ai]      weak i glides onto a  -> 1 nucleus
saida   -> s[a][i]da  í is stressed (hiatus) -> sa-í-da -> 3 nuclei
coracao -> cora[cao]  ã + o nasal diphthong  -> co-ra-ção -> 3 nuclei
poeta   -> p[o][e]ta  two strong vowels      -> po-e-ta  -> 3 nuclei

Strong vowels are a, e, o; weak vowels are unstressed i and u. Two strong vowels never share a syllable, an accented weak vowel forms its own syllable, and a weak vowel next to a strong vowel glides into one nucleus (a diphthong). Tilde clusters such as ão, ãe, and õe are single nuclei.

European vs Brazilian

The orthographic syllable count is identical in both varieties, but European Portuguese reduces unstressed vowels far more in speech. With the toggle on, an unstressed final e or es after a consonant is dropped, so noite collapses from noi-te to a single spoken syllable. Brazilian Portuguese keeps every written syllable, which is why the default sentence O coração da menina cantava uma canção à noite reports a higher count in Brazilian mode. Use the per-word breakdown to confirm how each word was split.