Quanto / Quanta / Quantos / Quantas (How Much/Many)

Quanto is how Brazilian Portuguese asks how much and how many — and it hides a feature that trips up every English speaker: it agrees in gender and number with whatever it's asking about. Where English has just two invariable words (how much for uncountables, how many for countables), Portuguese has four forms — quanto, quanta, quantos, quantas — and you have to pick the right one. This page shows you the logic so you never have to guess.

The four forms and why they exist

English speakers find this strange because no English question word inflects. We say "how many apples" and "how many cars" with the same how many. Portuguese, though, treats quanto like an adjective: it points at a noun, and like all adjectives in Portuguese, it copies that noun's gender and number.

The mental move is simple: first decide what noun you're asking about, then match. Dinheiro is masculine and treated as a mass, so quanto. Pessoas is feminine plural, so quantas. The form follows the noun, not the English word you started from.

The big exception: bare "Quanto custa?"

Here's the part that confuses people most. When quanto stands alone before a verb — with no noun right after it — it stays in the default masculine singular quanto, no matter what's being priced.

Notice the last one: even though sandálias is feminine plural, quanto itself does not become quantas. Why? Because in Quanto custam...? the quanto isn't modifying sandálias — it's standing in for the price, an abstract amount, which is grammatically masculine singular by default. The verb (custam) still agrees with sandálias, but the question word doesn't. So you get the slightly odd-looking but correct mix: invariable quanto + plural verb custam.

A handy way to remember it: if a noun comes right after quanto, it agrees with that noun; if a verb comes right after, it stays quanto.

Asking someone's age: "Quantos anos você tem?"

Brazilians don't "be" a number of years old — they have them. Age is quantos anos (literally "how many years") plus the verb ter ("to have"). This is a guaranteed early-conversation question, so lock it in.

Since anos is masculine plural, the form is always quantos here — never quanto or quantas. The whole frame Quantos anos... ter? is fixed.

"Quanto tempo": how long

To ask about a span of time, use quanto tempo ("how much time / how long"). Tempo is masculine singular, so it's always quanto.

The standalone exclamation Quanto tempo! is also a warm, very common greeting when you run into someone you haven't seen in ages — "Long time no see!"

"Quanto a": as for / regarding (not a question)

A different use worth recognizing: quanto a (+ noun/pronoun) means "as for / as regards," a topic-shifting connector. It's slightly more careful or formal, common in writing and considered speech. Here quanto does not vary — it's a frozen connective.

Note the mandatory contraction: quanto a + o becomes quanto ao, and quanto a + a becomes quanto à (with the grave accent, the crase).

Quanto in exclamations

Outside questions, quanto also powers exclamations of amount — "so much / so many," with full agreement.

This mirrors the English "what a lot of..." or the exclamatory "so much / so many," and the agreement rule is exactly the same as in questions.

How this differs from English

The single biggest gap: English splits how much (uncountable) from how many (countable), but neither English form inflects for gender — gender doesn't exist on English nouns. Portuguese collapses the much/many distinction (it's all quanto-family, the verb and noun handle countability) but adds a gender axis English speakers have never had to track. So your effort shifts from "much or many?" to "which gender, and is a noun or a verb coming next?"

The other quiet trap is Quanto custa?: English "how much" feels like it should agree with the plural thing, but Portuguese keeps the standalone quanto invariable because it refers to the abstract price, not the goods.

Common Mistakes

When quanto sits before the verb (referring to price/amount), it stays masculine singular — quanto — even if the goods are feminine plural. Only the verb agrees with sandálias.

When a noun follows directly, quanto must match it. Pessoas is feminine plural, so quantas.

Age uses anos (masculine plural), so the form is quantos. And remember the verb is ter, not ser.

Don't confuse quanto (how much/many, with nouns) with quão (how, with adjectives/adverbs — quão grande, "how big," and quite formal/literary at that). For amounts of a noun, it's always quanto.

Quanto tempo is fine here (masculine singular); the error is the verb. To ask "how long have you (been)...," BR commonly uses Há quanto tempo... ? with the present tense.

Key Takeaways

• quanto / quanta / quantos / quantas — the only question word that agrees in gender and number.
• A noun right after → agree with it (quantas pessoas). A verb right after → stay quanto (Quanto custam...?).
• Age: Quantos anos você tem? (with ter, not ser).
• Time span: quanto tempo (always quanto); the greeting Quanto tempo! = "Long time no see!"
• Quanto a / quanto ao / quanto à = "as for / regarding" — a frozen, slightly formal connector, not a question.