This is the great headache of Portuguese. Both por and para can translate into English as for, to, through, or by, and both can introduce the person or thing involved in an action. But they mark opposite sides of a single conceptual divide: para points forward, por points backward. Para names a goal, a destination, a recipient, a deadline — the thing the action is aimed at. Por names a cause, an agent, a route, a reason — the thing that explains how or why the action happened.
Learners coming from English have no intuition for this split because English collapses the two sides under the same handful of words. Learners coming from Spanish already have the scaffolding, but the Portuguese distribution is not identical to the Spanish one and a few habits will lead you astray. This page lays out every major use of each preposition side by side, gives you a decision procedure, and calls out the sneaky overlap cases.
The core intuition
Keep this image in mind throughout the page: imagine a process with a cause on the left and a result on the right. An arrow points from cause to result.
- Para is the arrow's head — the target, the goal, the endpoint, the person or thing the arrow lands on.
- Por is the arrow's tail or shaft — the cause that fired it, the route it travelled, the price paid to send it, the agent who shot it.
Every use below is a specific instance of that picture. When you are stuck, ask yourself: am I naming the goal (para) or the cause/route (por)?
Destination vs. route
Para names where something is going. Por names where it passes through on the way.
Vou para Lisboa amanhã — vou ficar lá a trabalhar dois meses.
I'm going to Lisbon tomorrow — I'm staying there working for two months.
Passei por Lisboa ontem, mas não tive tempo de parar.
I went through Lisbon yesterday, but I didn't have time to stop.
The first sentence has Lisbon as the destination. The second has Lisbon as part of the route. Para gives you the endpoint; por gives you a point on the way.
O comboio para o Porto sai daqui a dez minutos.
The train to Porto leaves in ten minutes.
Este comboio passa pelo Porto, mas vai até Braga.
This train passes through Porto, but goes all the way to Braga.
This pair is especially clear: para o Porto is the endpoint, pelo Porto is a stopover on the line.
Purpose vs. cause
Para names the purpose — why you did it, what you were aiming at. Por names the cause — what made it happen, what prompted the action.
Estudei muito para passar no exame.
I studied a lot in order to pass the exam.
Estudei muito por medo de chumbar.
I studied a lot out of fear of failing.
Both sentences explain why I studied. The first one names the goal (passing). The second one names the emotion that drove me (fear). Purpose → para. Cause → por.
Fui ao médico por causa das dores de cabeça.
I went to the doctor because of the headaches.
In everyday speech, the phrase por causa de is the most common cause marker. It maps cleanly onto English because of. Para, by contrast, maps onto English in order to or so as to.
Agent vs. recipient
Por names who did something (in the passive voice). Para names who something is for (as a gift or beneficiary).
O livro foi escrito pela Agustina Bessa-Luís.
The book was written by Agustina Bessa-Luís.
Este livro é para a minha mãe.
This book is for my mother.
Same noun (livro), two different roles. Pela Agustina is the agent — she did the writing. Para a minha mãe is the recipient — the book is destined for her.
O bolo foi feito pela vizinha e entregue para a festa do João.
The cake was made by the neighbour and delivered for João's party.
Single sentence, both prepositions, different jobs. Pela vizinha tells us who made the cake; para a festa tells us where the cake was heading.
Means vs. beneficiary
Por names the means — the channel, the medium, the way. Para can also appear with beneficiaries, and the contrast is sometimes subtle.
Avisa-me por SMS quando chegares.
Text me when you get there.
Mandei o ficheiro por email ao teu chefe.
I sent the file by email to your boss.
A carta chegou por correio registado.
The letter arrived by registered post.
In each case, por names the medium — SMS, email, post. Portuguese never uses para for means. Mandar algo para email would be nonsense.
Exchange vs. purpose
Por marks what is given in exchange. Para never does this.
Paguei cinquenta euros por este par de sapatos.
I paid fifty euros for this pair of shoes.
Comprei estes sapatos para ir ao casamento.
I bought these shoes to go to the wedding.
The first sentence names the price (what I gave up in exchange). The second names the purpose (why I made the purchase). Exchange → por. Purpose → para.
Troquei o carro por uma bicicleta elétrica.
I traded the car for an electric bike.
Troquei o carro para ter um transporte mais ecológico.
I traded the car to have more eco-friendly transport.
Again: the bike is what I got in exchange (por); having green transport is why I did it (para).
Duration vs. deadline
Por can mark duration — how long an action lasts. Para marks a deadline — by when something is due.
Vou ficar em Lisboa por duas semanas.
I'm going to stay in Lisbon for two weeks.
Preciso desta tradução para segunda-feira.
I need this translation by Monday.
Both involve time, but the roles are different. Por duas semanas names the span of the stay. Para segunda-feira names the deadline. You cannot swap them: fico em Lisboa para duas semanas would sound like you are scheduling your arrival to last until a two-week marker, which is not what the Portuguese sentence means.
Benefit: the subtle case
This is the most common source of error for English speakers. Both por and para can introduce the person involved, but they mean something different.
- Para ti = for you as recipient/beneficiary. The action is aimed at you.
- Por ti = for your sake as cause. The action happens because of you.
Comprei este livro para ti.
I bought this book for you (you are the recipient).
Faço tudo isto por ti.
I do all this for you (for your sake, because of you).
In English both sentences use for you. In Portuguese they split into two distinct thoughts. The first says you will receive the book. The second says your existence, your request, your worth is what motivated the action — you may or may not receive anything physical.
Fiz este bolo para a minha mãe.
I made this cake for my mother (she gets the cake).
Fiz este bolo pela minha mãe.
I made this cake for my mother (for her sake, because she asked me to, in her honour).
Two different cakes, conceptually. One ends up on the mother's plate; the other might be eaten by anyone, but it was made because of her.
When the English sentence uses for + person, ask yourself: could I swap in for the sake of and still mean what I mean? If yes, it is por. If the sentence would break, it is para.
Opinion: always para
Para introduces a personal opinion (in my view, as far as I'm concerned).
Para mim, este é o melhor restaurante da cidade.
For me, this is the best restaurant in town.
Por never does this job. Por mim means on my behalf or as far as I'm concerned in an action sense (as in por mim, pode ser, fine by me), but it is not the opinion marker.
Comparison: always para
Para expresses given Y, for a Y, considering Y.
Para uma criança de cinco anos, ele fala muito bem inglês.
For a five-year-old, he speaks English really well.
Está calor para novembro.
It's warm for November.
Por cannot appear here. Comparison to a reference point is para territory exclusively.
Rate and distribution
Por marks distribution — per unit.
O bilhete custa dez euros por pessoa.
The ticket costs ten euros per person.
Vou ao ginásio três vezes por semana.
I go to the gym three times a week.
English uses per or a ("three times a week"); Portuguese uses por. You do not say para semana for the rate — that would mean by next week (a deadline).
Substitution and behalf
Por can mean in place of, on behalf of.
Ela falou pelos colegas todos na reunião.
She spoke on behalf of all her colleagues in the meeting.
This overlaps with por as cause in some cases, but the "standing in for someone" reading is distinctive. Para cannot express substitution.
Side-by-side decision table
| Role | Preposition | Example | English |
|---|---|---|---|
| Destination (going to stay) | para | Vou para Lisboa. | I'm moving to Lisbon. |
| Route / through | por | Passei por Lisboa. | I went through Lisbon. |
| Purpose / in order to | para | Estudei para passar. | I studied in order to pass. |
| Cause / because of | por | Cheguei tarde por causa do trânsito. | I was late because of traffic. |
| Agent (passive voice) | por | Feito por um amigo. | Made by a friend. |
| Recipient / beneficiary (object) | para | Uma prenda para ti. | A gift for you. |
| For someone's sake | por | Faço isto por ti. | I do this for you(r sake). |
| Means / medium | por | Por email, por telefone. | By email, by phone. |
| Exchange / price | por | Paguei cinco euros por isto. | I paid five euros for this. |
| Duration | por | Fiquei por duas semanas. | I stayed for two weeks. |
| Deadline | para | Preciso disto para amanhã. | I need this by tomorrow. |
| Comparison / given Y | para | Alto para a idade. | Tall for his age. |
| Opinion / in my view | para | Para mim, está errado. | For me, it's wrong. |
| Rate / distribution | por | Dez euros por pessoa. | Ten euros per person. |
| On behalf of / in place of | por | Assino por ti. | I'll sign on your behalf. |
Decision procedure
When you hit a for or to in your English sentence, run through these questions in order. The first yes picks your preposition.
- Am I naming a goal or endpoint I am heading toward? → para
- Am I naming a deadline? → para
- Am I naming a beneficiary or recipient (the action lands on them)? → para
- Am I giving an opinion or comparison? → para
- Am I naming a cause or reason? → por
- Am I naming a route or path through which something passed? → por
- Am I naming an agent (passive voice)? → por
- Am I naming a means, price, or rate? → por
- Am I naming a duration? → por
- Am I saying I act on someone's behalf or for their sake? → por
Questions 1 through 4 are para (forward-looking). Questions 5 through 10 are por (backward-looking).
Both prepositions in a single sentence
The clearest demonstration that the system works is when both appear in one sentence doing different jobs.
Estudei português por curiosidade e para viver em Lisboa um dia.
I studied Portuguese out of curiosity and to live in Lisbon one day.
Comprei o bolo pela receita da tua avó, para o levarmos à festa.
I made the cake using your grandmother's recipe, to take to the party.
Paguei cinquenta euros por este livro para oferecer ao meu pai.
I paid fifty euros for this book to give to my father.
In each sentence, por explains the cause, price, or means, and para names the purpose or recipient. The two prepositions are doing genuinely different work, and Portuguese needs both.
Common mistakes
These errors show up constantly in learner writing. Each one reflects a specific transfer from English or Spanish.
❌ Obrigado para a ajuda.
Incorrect — 'thanks for' is thanks caused by, not thanks destined for.
✅ Obrigado pela ajuda.
Thanks for the help.
❌ Vou ficar aqui para dois dias.
Incorrect — this is a duration, not a deadline.
✅ Vou ficar aqui por dois dias.
I'm going to stay here for two days.
❌ Este presente é por ti.
Incorrect if the gift is destined for the person — use para for recipient.
✅ Este presente é para ti.
This present is for you.
❌ Troquei o carro para uma bicicleta.
Incorrect — exchange is por, not para.
✅ Troquei o carro por uma bicicleta.
I traded the car for a bicycle.
❌ Mandei o ficheiro para email.
Incorrect — means is por, and there's no article here.
✅ Mandei o ficheiro por email.
I sent the file by email.
❌ Preciso disto por amanhã.
Incorrect — this is a deadline, not a duration or cause.
✅ Preciso disto para amanhã.
I need this by tomorrow.
❌ Por mim, este é o melhor filme do ano.
Incorrect — opinion is para mim, not por mim.
✅ Para mim, este é o melhor filme do ano.
For me, this is the best film of the year.
❌ Ele viaja para a Europa de comboio todos os verões.
Ambiguous — if he's travelling around/through Europe, it's por.
✅ Ele viaja pela Europa de comboio todos os verões.
He travels around Europe by train every summer.
❌ Corri para o parque por manter a forma.
Incorrect — purpose is para, not por.
✅ Corri no parque para manter a forma.
I ran in the park to stay in shape.
The most dangerous of these is the obrigado pela case: English thanks for maps to Portuguese obrigado por, never obrigado para. If you stop and think "the thank-you is caused by the help," you will pick the right preposition.
A note for Spanish speakers
Spanish and Portuguese share the por/para distinction, but the distribution is not identical. Some specific points:
- Portuguese por is more common for duration than Spanish por; Spanish often uses durante where Portuguese uses por or no preposition at all.
- Spanish para
- person is more common as a beneficiary than Portuguese para
- person; Portuguese more readily uses a for the indirect object.
- person is more common as a beneficiary than Portuguese para
- The classic Spanish estar para ("to be about to") has a PT-PT cognate estar para meaning "to be inclined to" or "to be up for": não estou para isto means I'm not in the mood for this.
Do not assume a Spanish habit will transfer cleanly. When in doubt, run through the decision procedure on this page.
Key takeaways
- Para is the arrow's head: destination, purpose, recipient, deadline, comparison, opinion.
- Por is the arrow's tail/shaft: cause, route, agent, means, exchange, duration, rate, behalf.
- Obrigado por (not para) — thank-you is caused.
- Duration → por; deadline → para.
- Recipient → para; for-someone's-sake → por.
- When you see English for or to, run the decision procedure: goal or cause, forward or backward?
- In a single sentence, both prepositions can coexist doing different jobs. That is the system working correctly.
For the other big contrast involving motion, see a vs. para.
Related Topics
- The Preposition porA2 — Uses of the preposition por — agent, cause, means, route, duration, and its obligatory contractions pelo/pela.
- The Preposition paraA1 — Uses of the preposition para — purpose, destination, recipient, deadline, comparison, and the para vs. por distinction.
- a vs. para: Choosing the Right 'to'A2 — How to choose between a and para when English says 'to' — short trips versus relocation, indirect objects, deadlines, purpose, and the PT-PT standard.
- Contractions with porA2 — How por contracts obligatorily with definite articles to produce pelo, pela, pelos, and pelas — with historical notes and what does not contract.
- Portuguese Prepositions OverviewA1 — Introduction to Portuguese prepositions and their uses, including the obligatory contractions that set European Portuguese apart.