Portuguese (Brazil) · Pronunciation Guide
KWAHN-too. A real "kw," a nasal stressed vowel, and a final o raising to "oo."
The "kwan" is loud, exactly as in "quando." Grammatically the word agrees when it modifies a noun — "quantos livros," "quantas pessoas" — and stays invariable when it asks about price or amount, as in "quanto custa." The stress never moves across any of those forms.
Listen: quanto
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Quanto custa isso?
How much does this cost?
Listen: Quanto custa isso?
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"Quanto custa isso?" uses the invariable form because it's asking about an amount rather than counting things. "Custa" has a syllable-final s that stays a hiss, and "isso" has a double s kept unvoiced between vowels, so the sentence has three unvoiced sibilants and no z at all.
Silencing the u to get "KAN-too" is the recurring qu error. Before an a the u speaks. English speakers also produce a full n instead of a nasal vowel. And the agreement rule catches people out: "quanto tempo" is right but "quanto horas" is not — it has to be "quantas horas."