Qual (plural quais) means which — it asks you to pick from a set of known options. But it has a second job that surprises every English speaker: Brazilian Portuguese uses Qual é...? in many places where English uses what — above all for asking someone's name, number, address, or "what is X." Getting this right is the difference between sounding natural and sounding translated.
The core meaning: selecting from a set
The basic, intuitive use of qual is which — choosing one (or some) out of a defined group. There's a contrast in play: which one of these, as opposed to the others?
Qual você quer, o vermelho ou o azul?
Which one do you want, the red or the blue?
Qual é o seu prato favorito daqui?
Which is your favorite dish here?
De todos esses filmes, qual você mais gostou?
Of all these movies, which did you like best?
Qual agrees in number, not gender — there is no quala. The only change is singular → plural: qual → quais.
Quais são os seus, esses aqui?
Which ones are yours, these here?
Quais línguas você fala?
Which languages do you speak?
The big one: "Qual é o seu nome?" — BR uses qual where English uses what
This is the most important point on the page. For asking someone to identify a piece of information — their name, phone number, address, the capital of somewhere, the problem — Brazilian Portuguese overwhelmingly uses Qual é...?, even though English uses what.
Qual é o seu nome?
What's your name?
Qual é o seu telefone?
What's your phone number?
Qual é a capital de Pernambuco?
What's the capital of Pernambuco?
Qual é o problema?
What's the problem?
To an English speaker this feels backwards, because we'd never say "which is your name." But the Portuguese logic holds together: your name is one specific item drawn from the open set of all possible names — Portuguese frames identification as selection. So "what's your X?" almost always maps to Qual é o seu X?, not O que é...?.
The contrast with o que é is sharp and worth memorizing:
Qual é a sua profissão?
What's your profession? (which one, from all jobs)
O que é uma profissão?
What is a profession? (asking for a definition)
O que é...? asks for a definition or explanation of something ("what is a black hole?"). Qual é...? asks you to specify which one ("what is your favorite/name/number?"). Different questions entirely, even though English flattens both to what.
In fast speech you'll constantly hear it reduced: Qual é o seu nome? → Qual seu nome? or just Qual o seu nome? (dropping é). And the standalone slangy Qual é? / Qual foi? means "What's up? / What's the deal?" among friends.
E aí, qual é o plano pra hoje?
So, what's the plan for today?
Qual vs que vs o que: the three-way split
This is the cluster that causes the most trouble. Here's the practical division:
| Word | Use it for | Example |
|---|---|---|
| qual / quais | selecting from a set; identifying a specific item (name, number...) | Qual é o seu nome? |
| que | "which/what" directly before a noun | Que cor você prefere? |
| o que | "what" standing alone; asking for a definition | O que aconteceu? |
Que horas são?
What time is it? (que + noun)
O que você está fazendo?
What are you doing? (o que, standing alone)
Qual desses ônibus vai pro centro?
Which of these buses goes downtown? (selection from a set)
The overlap that confuses learners: before a noun, both que and qual can sometimes appear. Que cor? and Qual cor? are both heard, but there's a nuance — que + noun is the lighter, more idiomatic everyday choice ("what color?"), while qual leans toward an explicit, bounded set of options ("which color, of these swatches?"). When in doubt before a noun, que is the safer, more natural pick in speech: Que dia? Que horas? Que tamanho?
Que tamanho você usa?
What size do you wear?
Qual tamanho fica melhor, o P ou o M?
Which size fits better, the small or the medium?
Notice how the second sentence makes the bounded set explicit (o P ou o M) — that's the natural home of qual.
"Qual" without "é": with other verbs
Qual isn't limited to ser. It pairs with any verb when you're selecting.
Qual você prefere?
Which do you prefer?
Qual time ganhou ontem?
Which team won yesterday?
Quais combinam melhor com essa calça?
Which ones go best with these pants?
How this differs from English
Two structural differences drive every mistake here:
- English what splits into BR o que (definition / open) and qual (identification / selection). English doesn't distinguish them; Portuguese forces the choice. The single most useful heuristic: "what is your _?" → Qual é o seu _?.
- English which never inflects; qual pluralizes to quais. "Which ones" must become quais, with the verb in the plural too: Quais são? ("Which are they?").
Spanish speakers, by contrast, have a near-perfect parallel (cuál/cuáles works almost identically), so for them the main caution is spelling — qual/quais, no accent — not usage.
Common Mistakes
❌ O que é o seu nome?
Incorrect — this asks for a definition of 'your name'
✅ Qual é o seu nome?
What's your name?
The classic transfer error. O que é...? asks "what does X mean?" — so O que é o seu nome? sounds like "what does your name mean / consist of?". For identification, use Qual é o seu nome?.
❌ Qual são os seus livros?
Incorrect — qual doesn't agree with a plural
✅ Quais são os seus livros?
Which are your books?
Qual must become quais when the answer is plural. The verb (são) is already plural, so the question word has to match.
❌ Quala é a sua resposta?
Incorrect — there is no feminine form 'quala'
✅ Qual é a sua resposta?
What's your answer?
Qual never marks gender. There is no quala — only qual (singular) and quais (plural), for any gender.
❌ Qual aconteceu na reunião?
Incorrect — this asks 'which one happened', not 'what happened'
✅ O que aconteceu na reunião?
What happened in the meeting?
When you're asking what occurred — an open "what," not a choice from a set — use o que, not qual.
❌ Qual é um buraco negro?
Incorrect — this is a definition question
✅ O que é um buraco negro?
What is a black hole?
Asking for a definition is o que é...?, not qual é...?. Reserve qual é for identifying a specific item, not explaining what a thing is.
Key Takeaways
- qual / quais = which — selecting from a set; agrees in number only (no quala).
- BR uses Qual é o seu...? where English says "what's your...?" (name, number, address, favorite, problem).
- O que é...? = asking for a definition; Qual é...? = identifying a specific item. English merges both as what.
- Before a noun, everyday speech prefers que (Que horas? Que cor?); qual signals an explicit set of options.
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Start learning Portuguese→Related Topics
- Que vs O Que (What)A1 — When to use 'que' (+ noun), standalone 'o que', sentence-final accented 'o quê', and exclamatory 'que' — the three faces of 'what' in Brazilian Portuguese.
- Quem (Who/Whom)A1 — How to ask about people with 'quem' — as subject, object, and with fronted prepositions ('Com quem? De quem?') — with no inversion and singular agreement.
- Questions: OverviewA1 — How Brazilian Portuguese forms questions — yes/no by intonation alone, wh-questions by fronting with no inversion, plus the full question-word inventory.
- Interrogative Qual / Quais: WhichA1 — Using qual and quais to ask 'which' (and sometimes 'what') in Brazilian Portuguese, including the key Qual é o seu nome? pattern.