If you want the one-line answer to "what does por mean?", here it is: por answers the question why?. It points backward, to the cause, motive, or reason behind an action. Lo hizo por amor — he did it out of love. Llegamos tarde por el tráfico — we arrived late because of the traffic. Lo despidieron por llegar tarde — he was fired for being late. Por is the preposition of explanation, blame, motivation, and looking-back-at-why.
This is one of three big jobs the preposition does (the others are through for movement and in exchange for for transactions). All three are united by the underlying idea of cause / pass / exchange — but for an A2 learner, treating "cause" as the central case and the others as extensions is the cleanest path in.
The core idea: cause and motive
When you can rephrase the English sentence as because of X, out of X, due to X, or on account of X, Spanish wants por.
Llegamos tarde por el tráfico, había caravana en la M-30.
We arrived late because of the traffic — there was a jam on the M-30.
Lo hizo por amor, no por dinero.
He did it out of love, not for money.
No salimos por la lluvia, nos quedamos viendo una peli.
We didn't go out because of the rain — we stayed in watching a film.
Está enfermo por culpa de no abrigarse.
He's sick because he didn't wrap up warm.
Por culpa de (literally "by fault of") is a colloquial intensifier — it adds a tinge of blame to the cause. No vine por culpa del tráfico sounds more accusatory than the neutral no vine por el tráfico.
¿Por qué? vs porque vs por que vs porqué
This is one of the most stumbled-over orthography points in Spanish, and it's directly tied to the cause meaning of por. There are four forms, all closely related, all distinct.
| Form | Function | Example |
|---|---|---|
| ¿por qué? (two words, accent) | question word: why? | ¿Por qué no viniste? |
| porque (one word, no accent) | conjunction: because | No vine porque llovía. |
| por que (two words, no accent) | "for which" — rare, formal | La razón por que lo hizo... (= por la cual) |
| el porqué (one word, accent, noun) | noun: the reason | Quiero saber el porqué. |
The two everyday ones — ¿por qué? and porque — are the ones that matter most. The pattern is simple: the question is two words with an accent; the answer is one word with no accent.
¿Por qué no me lo dijiste antes? — Porque pensé que ya lo sabías.
Why didn't you tell me before? — Because I thought you already knew.
¿Por qué pasa esto? — Nadie sabe el porqué.
Why is this happening? — Nobody knows the reason.
Por + infinitive: "for doing" / "because of doing"
A particularly Spanish use of por is putting it in front of an infinitive to mark the cause of an action — usually the reason someone was punished, rewarded, or judged.
Lo despidieron por llegar tarde tres veces seguidas.
They fired him for arriving late three times in a row.
Le dieron una medalla por salvar a un niño de un incendio.
They gave him a medal for saving a child from a fire.
Me regañaron por no haber avisado.
I got told off for not having let them know.
Notice the structure: por + infinitive (or por haber + past participle for past actions). In English, this is usually translated with "for + -ing" or "because (he) had + past participle." It's a tight, useful construction once you spot the pattern.
Por for the agent of passive voice
When you turn an active sentence into a true passive (with ser + past participle), the agent — the doer — is introduced with por.
La carta fue escrita por María en 1923.
The letter was written by María in 1923.
El cuadro fue pintado por Velázquez para el rey.
The painting was painted by Velázquez for the king.
La ley fue aprobada por unanimidad por el Congreso.
The law was approved unanimously by Congress.
True passive voice (ser fue escrita) is much more common in formal writing than in conversation; spoken peninsular Spanish prefers se passives (se escribió la carta) or active sentences. But when you do meet a ser-passive, the agent will always be marked with por.
The logic is consistent with the cause meaning: the agent is the cause of the action. Fue escrita por María — María is what brought the writing into being. Por keeps doing what it always does.
Por for exchange and rate (a brief mention)
A close relative of cause is exchange — getting one thing in return for another. Spanish handles this with por too.
Pagué veinte euros por el libro.
I paid twenty euros for the book.
Trabaja por horas, no tiene contrato fijo.
He works by the hour — he doesn't have a permanent contract.
Cambié mi coche viejo por uno de segunda mano más nuevo.
I traded my old car for a newer second-hand one.
This use has its own page (Por para intercambio); the point here is just to flag that "exchange por" is part of the same family. The thing on the por-side is what motivates or causes the transaction.
Idiomatic causes
A handful of fixed por phrases mark common kinds of cause — luck, chance, mistake — and are essential vocabulary at A2.
| Phrase | Meaning |
|---|---|
| por suerte | luckily |
| por desgracia | unfortunately |
| por casualidad | by chance / accidentally |
| por error / por equivocación | by mistake |
| por descuido | through carelessness |
| por culpa de | because of (with blame) |
| por miedo (a) | out of fear (of) |
| por amor (a) | out of love (for) |
| por motivos de | for reasons of |
| por orden de | by order of |
Por suerte llegamos justo cuando empezaba la película.
Luckily, we arrived just as the film was starting.
Mandé el correo a la dirección equivocada por error.
I sent the email to the wrong address by mistake.
Por motivos personales, no asistirá a la reunión.
For personal reasons, he will not attend the meeting.
Por vs para: the cause/purpose split
This is the most famous Spanish preposition contrast and it deserves at least a sketch here, even though it has its own dedicated page.
The core distinction:
- por = because of / cause / looking back at the reason
- para = in order to / purpose / looking forward to the goal
| Sentence | Meaning |
|---|---|
| Estudio por mis padres. | I study because of my parents (they push me, they're the cause). |
| Estudio para mis padres. | I study for my parents (to make them proud — they're the goal). |
| Lo hago por ti. | I'm doing it because of you / for your sake (you're the motivator). |
| Lo hago para ti. | I'm doing it for you (you'll receive it / it's intended for you). |
Vine por ti, sabía que necesitabas apoyo.
I came because of you / for your sake — I knew you needed support.
Compré este regalo para ti, espero que te guste.
I bought this present for you — I hope you like it.
In many real Spanish sentences, both por and para are grammatical and the difference is genuinely subtle. Trabajo por mi familia (I work because of my family — they motivate me) vs trabajo para mi familia (I work for my family — they're the recipients of what I earn) can blur in everyday speech. Don't agonise over edge cases at A2; aim for the clear cases first. The Por vs para page goes into the gray areas.
Common Mistakes
❌ Llegué tarde porque del tráfico.
Wrong — porque + clause (porque había tráfico). For 'because of + noun', use por or a causa de.
✅ Llegué tarde por el tráfico.
I arrived late because of the traffic.
❌ Estudio para mis padres me obligan.
Wrong — para is for purpose, not cause. And before a clause, you'd need porque.
✅ Estudio porque mis padres me obligan.
I'm studying because my parents make me.
❌ Porqué no viniste ayer?
Wrong — the question 'why?' is ¿por qué? (two words, accent), not porqué.
✅ ¿Por qué no viniste ayer?
Why didn't you come yesterday?
❌ No vine por que estaba enfermo.
Wrong — 'because' as a conjunction is porque (one word, no accent).
✅ No vine porque estaba enfermo.
I didn't come because I was sick.
❌ Lo despidieron para llegar tarde.
Wrong — para marks purpose; the cause of firing takes por.
✅ Lo despidieron por llegar tarde.
They fired him for arriving late.
Key takeaways
- Por is the preposition of cause, motive, reason, and blame — it answers why?.
- ¿Por qué? (two words, accent) is the question; porque (one word, no accent) is the answer; el porqué (one word, accent, noun) is "the reason."
- Por + infinitive compactly expresses "for doing / because of doing": lo despidieron por llegar tarde.
- Por introduces the agent of passive voice: fue escrito por María.
- A handful of fixed por phrases mark everyday causes: por suerte, por casualidad, por error, por culpa de.
- The headline contrast with para: por looks backward at the cause, para looks forward at the goal.
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Start learning Spanish→Related Topics
- Preposiciones: panorama generalA1 — An overview of the Spanish preposition inventory, their core meanings, and the fundamental rule that prepositions never map one-to-one to English.
- Por para movimiento a travésA2 — When you move through, along, or around a place — not toward a destination — Spanish uses 'por'. The same preposition also covers diffuse location ('por aquí'), routes, and means of transmission ('por teléfono').
- Para para finalidadA2 — Spanish 'para' answers 'what for? / to what end?' — it marks purpose, goal, intended use, recipient, opinion, and employer. It is the forward-looking counterpart to backward-looking 'por'.
- Por vs para: la guía esencialA2 — The classic Spanish preposition contrast: 'por' looks backward (cause, path, exchange, agent), 'para' looks forward (purpose, destination, deadline, recipient). With 20 minimal pairs to make the difference click.
- Por para intercambioB1 — Spanish 'por' marks exchange — money paid, items swapped, substitution, rates and ratios. The thing on the por-side is what is given (or counted) in return for the thing on the other side.
- Errores: traducciones literalesB1 — The constituent words map but the construction doesn't. 'I'm good' (no, thanks) is NOT 'estoy bueno'. 'My name is Juan' is more naturally 'me llamo Juan'. The high-frequency calque traps for English speakers in everyday peninsular Spanish.