Todo vs. Tudo: Variable vs. Invariable | Portuguese (Portugal) Grammar

Portuguese has two separate words where English uses one. Everything, everybody, every, all, the whole — in English, all these meanings cluster around a small set of interchangeable items. Portuguese carves the territory in two. Todo (and its feminine and plural forms toda, todos, todas) is a determiner: it sits before a noun and agrees with it. Tudo is an invariable pronoun: it stands alone and means "everything" in the abstract. They are different words, with different jobs, and confusing them is one of the most audible errors a learner can make. This page builds a solid mental model so you never mix them up again.

The core distinction in one sentence

If there is a noun, use todo/toda/todos/todas. If there is no noun — if you mean "everything" in the abstract — use tudo.

Tudo corre bem.

Everything is going well. (tudo stands alone — abstract 'everything')

Todos os meus planos correm bem.

All my plans are going well. (todos modifies 'planos')

Aconteceu tudo muito depressa.

Everything happened very fast.

Aconteceram todas as coisas que ele previu.

All the things he predicted happened.

That is the whole rule. The rest of this page unpacks it, gives you diagnostics for borderline cases, and walks through the transfer errors that English and Spanish speakers consistently make.

Tudo — the invariable pronoun

Tudo is a pronoun. It never takes a noun, never takes an article, never changes form. It is neuter and singular by default, referring to "the totality of unspecified things."

Form	Agreement	Meaning
tudo	None — invariable	everything (abstract)

Tudo collects the world into a single indistinct heap. It does not sort the heap into items, does not pick out a specific kind of thing, does not count or classify. It just says "the whole of it."

Tudo é possível quando acreditas em ti.

Everything is possible when you believe in yourself.

Obrigada por tudo!

Thanks for everything!

Ela quer saber tudo sobre a viagem.

She wants to know everything about the trip.

Tudo o que disseste faz sentido.

Everything you said makes sense.

Não percebi tudo, mas a maior parte, sim.

I didn't understand everything, but most of it, yes.

Notice the common construction tudo o que — "everything that," literally "everything the-that." This is how Portuguese expresses a relative clause after tudo: the pronoun tudo plus the relative complex o que.

Tudo o que brilha não é ouro.

All that glitters is not gold.

Faço tudo o que puder para te ajudar.

I'll do everything I can to help you.

Tudo with demonstratives and quantifiers

Tudo combines with isto, isso, aquilo (the neuter demonstratives) and with mais:

Tudo isto é novo para mim.

All this is new to me.

Tudo isso são desculpas.

All that is just excuses.

Tudo aquilo que prometeste, cumpriste.

Everything (over there/that) you promised, you fulfilled.

Precisas de mais alguma coisa? — Não, tenho tudo.

Do you need anything else? — No, I have everything.

Observe that tudo isto / tudo isso / tudo aquilo does not contradict the rule. Isto, isso, aquilo are themselves pronouns, not nouns. There is still no noun in the phrase.

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A quick diagnostic: can you replace the English word with the whole thing or all of it, where "thing" is abstract and unspecified? If yes, it's tudo. If instead you'd say all the Xs or the whole X with a concrete X, it's todo.

Todo — the variable determiner

Todo is a determiner. It agrees with the noun it modifies in gender and number.

	Masculine	Feminine
Singular	todo	toda
Plural	todos	todas

Todo has three main uses, distinguished by the presence or absence of the article and by number.

Use 1 — todos os / todas as + plural noun = "all the"

With a plural noun plus the definite article, todos/todas means all (of) the — universal quantification over a set. Crucially, the article sits between todos and the noun: todos os alunos, not os todos alunos.

Todos os alunos passaram no exame.

All the students passed the exam.

Todas as minhas primas moram no Algarve.

All my (female) cousins live in the Algarve.

Visitei todos os museus de Lisboa.

I visited all the museums in Lisbon.

Todas as portas estavam fechadas.

All the doors were closed.

Use 2 — todo o / toda a + singular noun = "the whole, all of the"

With a singular noun plus the article, todo o / toda a means the whole, all of the. The article again sits between todo and the noun.

Toda a casa cheira a bolo.

The whole house smells of cake.

Estudou toda a noite para o exame.

He studied all night for the exam.

Ela leu todo o livro num só dia.

She read the whole book in a single day.

Chorei durante todo o filme.

I cried throughout the whole film.

Use 3 — todo / toda + bare singular noun = "every" (generic, slightly literary)

Without the article and with a singular noun, todo + noun means every in a sweeping, generic sense. This use is slightly literary in PT-PT — in everyday speech, cada or todos os + plural is more natural.

Todo homem é mortal.

Every man is mortal. (philosophical, generic — slightly literary)

Toda regra tem a sua exceção.

Every rule has its exception.

Toda criança merece proteção.

Every child deserves protection. (formal/written register)

In ordinary spoken PT-PT, you would more often hear todas as crianças merecem proteção or cada criança merece proteção. Reserve the bare todo homem, toda mulher pattern for proverbs, aphorisms, and formal writing.

The semantic nuance — todo o dia vs. todos os dias

Here is one of the most useful subtleties in Portuguese. Keep the two side by side:

Phrase	Meaning	Example
todo o dia	all day long (one continuous day)	Trabalhei todo o dia.
todos os dias	every day (repeated, habitual)	Trabalho todos os dias.

Trabalhei todo o dia.

I worked all day (today, continuously).

Trabalho todos os dias.

I work every day (habitually).

Chovia toda a noite.

It was raining all night (one specific night).

Chove todas as noites no inverno.

It rains every night in winter.

Ela esperou toda a semana.

She waited the whole week (one specific week).

Ela vai ao ginásio todas as semanas.

She goes to the gym every week.

English uses the same structure ("all day" vs. "every day"), so the distinction is not conceptually foreign — you just need to map it to the right Portuguese form. Singular with article for continuous duration; plural with article for habitual repetition.

Diagnostic questions

When you are about to write or say something with the meaning of "all, every, whole, everything," run these three questions:

Is there a noun after the word?
- Yes → use todo/toda/todos/todas.
- No → use tudo.
If there is a noun, is it singular or plural?
- Plural + "all of them" → todos os / todas as + noun.
- Singular + "the whole of it" → todo o / toda a + noun.
- Singular + generic "every" (rare, formal) → todo / toda + noun (no article).
If there is no noun, am I referring to an abstract "everything"?
- Yes → tudo.

Apply this to any uncertain sentence and you will almost always land on the right form.

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A simple heuristic for English speakers: when you say everything, think tudo; when you say all the Xs or the whole X, think todo/toda/todos/todas with an article. When you can't decide in the moment, just ask: "is there a noun?" — that alone resolves 95% of cases.

Tudo vs. todos — "everybody" and "everyone"

For everybody / everyone in reference to people, Portuguese does not use tudo (which would imply things, not people). Instead, it uses todos / todas (as a pronoun, without a noun), or toda a gente (the whole crowd), or todo o mundo (formal/literary).

Todos vieram à festa.

Everybody came to the party. (todos as a pronoun — people)

Toda a gente sabe disso.

Everybody knows that. (idiomatic PT-PT for 'everyone')

Todo o mundo gosta de ti.

Everyone likes you. (slightly formal/literary)

Estamos todos cansados.

We're all tired.

Toda a gente (literally "all the people") is the ordinary PT-PT way to say everyone, everybody in spoken language. Brazilian Portuguese prefers todo mundo (without the article), so the PT-PT pattern is a clear regional marker.

English and Spanish transfer errors

The Spanish "todo" trap

Spanish todo covers both senses — todo está bien (everything is fine) and todos los estudiantes (all the students). A Spanish speaker learning Portuguese naturally reaches for todo in both cases, producing todo está bem when they mean tudo está bem. This is the single most common transfer error.

❌ Todo está bem.

Sounds wrong in PT-PT — Spanish 'todo' here corresponds to Portuguese 'tudo'.

✅ Tudo está bem.

Everything is fine.

The English "everything + noun" trap

English lets you say all the students and everything is fine with flexible grammar. Some English-speakers overgeneralise and try tudo os alunos — "everything the students" — which is impossible in Portuguese. Tudo never takes a noun. If there is a noun, it must be todos/todas.

❌ Tudo os alunos passaram.

Impossible — tudo cannot take a noun.

✅ Todos os alunos passaram.

All the students passed.

Forgetting the article after todos

English speakers routinely drop the article after todos, producing todos alunos on the model of all students. In PT-PT, the article is almost always required: todos os alunos.

❌ Todos alunos passaram no exame.

Missing article — PT-PT requires 'todos os alunos'.

✅ Todos os alunos passaram no exame.

All the students passed the exam.

Fixed expressions with tudo

Learn these as units — they are extremely common in spoken PT-PT.

Tudo bem?

How are you? (informal greeting — lit. 'everything fine?')

Tudo em ordem.

Everything in order. / All good.

Ao fim e ao cabo, é tudo a mesma coisa.

In the end, it's all the same thing.

Antes de tudo, obrigado por teres vindo.

First of all, thank you for coming.

Tudo bem contigo?

All good with you?

Apesar de tudo, gostei da viagem.

In spite of everything, I enjoyed the trip.

Tudo ou nada.

All or nothing.

Fixed expressions with todo

Ao todo, somos doze.

In total, we're twelve.

De todo o coração.

With all my heart.

Em todo o caso, avisa-me.

In any case, let me know.

Por todo o lado havia flores.

Everywhere there were flowers.

A toda a hora me telefona.

He calls me at all hours / constantly.

Common Mistakes

❌ Tudo está bem.

Incorrect only if thinking in Spanish — actually this is fine in Portuguese ('everything is fine'). The error is the reverse: saying 'todo está bem' from Spanish habit.

✅ Tudo está bem.

Everything is fine.

❌ Eu quero todo.

Incorrect — 'todo' needs a noun. For 'everything', use 'tudo'.

✅ Eu quero tudo.

I want everything.

❌ Tudo livro que leio é bom.

Impossible — tudo cannot modify a noun.

✅ Todo livro que leio é bom.

Every book I read is good. (generic, literary)

✅ Todos os livros que leio são bons.

All the books I read are good. (more natural in spoken PT-PT)

❌ Todos alunos gostam da professora.

Missing article — PT-PT requires 'todos os alunos'.

✅ Todos os alunos gostam da professora.

All the students like the teacher.

❌ Vou ao ginásio todo o dia.

Means 'I go to the gym all day (continuously)' — probably not what you want for habitual.

✅ Vou ao ginásio todos os dias.

I go to the gym every day. (habitual)

❌ Ela fez tudo os exercícios.

Impossible — tudo cannot take a noun phrase.

✅ Ela fez todos os exercícios.

She did all the exercises.

❌ Eu sei todo.

Incorrect — 'todo' needs a noun. For 'I know everything', use 'tudo'.

✅ Eu sei tudo.

I know everything.

Key Takeaways

Tudo is an invariable pronoun meaning everything (abstract). It never takes a noun, never changes form, never takes an article.
Todo/toda/todos/todas is a variable determiner that agrees with a noun in gender and number.
Simple test: is there a noun? If yes → todo/toda/todos/todas. If no → tudo.
Todos os X / todas as X = all the Xs (plural, article between todos and noun).
Todo o X / toda a X = the whole X (singular, article between todo and noun).
Todo X / toda X (no article, singular) = every X — generic and literary; spoken PT-PT prefers cada or the plural todos os.
Todo o dia = all day (continuous); todos os dias = every day (habitual).
For everybody, everyone: use todos (as pronoun), toda a gente (idiomatic), or todo o mundo (formal).
The Spanish todo covers both Portuguese todo and tudo — Spanish speakers must retrain the reflex.
Never drop the article in todos os X — PT-PT requires it almost always.