Ask most learners what por means in Spanish and they'll say "for"; which is true, but only tells part of the story. Por also means "by", "through", "because of", "per", and "along", depending on context. This makes it one of the richest and most frequently used prepositions in the language, and one of the most important to understand fully.
This article goes deeper into por in Spanish than our overview guide; covering every use with extended examples, common expressions, and a quiz to help you practise. For the full comparison of both prepositions side by side, our por vs para guide is the best starting point.
from duration and reason to rate, passive voice, and time of day!
What Is Por in Spanish?
Por is a preposition: one of those small but essential words that connect other elements in a sentence and show the relationship between them. What makes por in Spanish particularly challenging for English speakers is that it has no single equivalent in English. Depending on the sentence, it can translate as "for", "by", "through", "because of", "along", or "per".
The core meaning of por is backward-looking: it refers to causes, origins, motives, durations, and means. This distinguishes it from para, which looks forward to goals, destinations, and recipients. If you want to express why something happened, how long something lasted, or by what means something was done, por is almost always the word you want.
Duration: 'for' a period of time → Estudié por tres horas (I studied for three hours)
Reason / cause: 'because of', 'out of' → Lo hice por amor (I did it out of love)
Exchange: 'in exchange for' → Lo cambié por otro (I swapped it for another)
Agent (passive): 'by' → Escrito por Lorca (Written by Lorca)
Movement / means: 'through', 'along', 'by' → Viajamos por el norte; hablamos por teléfono
Rate / proportion: 'per' → Cien kilómetros por hora (A hundred kilometres per hour)
Time of day: por la mañana, por la tarde, por la noche
On behalf of: 'for', 'in place of' → Lo haré por ti (I'll do it for you / in your place)
When to Use Por in Spanish?
The most reliable way to remember when to use por in Spanish is the acronym DREAM, introduced in our overview guide. This section expands each category with a wider range of examples to give you a fuller picture of how por works in real sentences.
D
Duration
Viví en Edimburgo por dos años. I lived in Edinburgh for two years.
R
Reason / Cause
Lo hice por amor. I did it out of love.
E
Exchange
Lo vendí por cincuenta libras. I sold it for fifty pounds.
A
Agent (passive)
Fue escrito por Cervantes. It was written by Cervantes.
M
Movement / Means
Viajamos por España; hablamos por teléfono. We travelled through Spain; we talked by phone.
Expressing Cause or Reason
When you want to express the reason something happened or the emotion that motivated an action, use por. In English you might say "because of", "out of", or "for the reason that"; all of these translate to por in Spanish. This is one of the most frequently used functions of por, and it appears constantly in everyday conversation.
Gracias por tu ayuda con los ejercicios.
Thank you for your help with the exercises.
Lo cancelaron por el mal tiempo.
They cancelled it because of the bad weather.
Estoy aquí por ti.
I'm here because of you / for you.
No pudo dormir por los nervios.
She couldn't sleep because of her nerves.
Notice how por here always points to a cause that already exists: something that happened because of something else. This is what distinguishes it from para, which points forward to a goal or purpose. When you want to say "I study in order to learn", that's para; when you say "I thanked her because of her help", that's por.
Indicating Means or Method
Por is used to express the means, channel, or method by which something is done or communicated. This includes forms of transport, technology, and communication: all the different ways one can send, receive, travel, or talk. English uses "by" in most of these contexts.
Nos comunicamos siempre por correo electrónico.
We always communicate by email.
Te mando los documentos por WhatsApp.
I'll send you the documents via WhatsApp.
Prefiero viajar por tren cuando voy al norte.
I prefer to travel by train when I go north.
La noticia se difundió por las redes sociales.
The news spread through social media.
A useful point to remember: whenever you want to say you're doing something by a particular channel or method (by phone, by post, by email, through a platform) por is your word. English speakers sometimes want to use "through" in these sentences, which is also a translation of por.
Tahir osman
Denoting Duration or Time Period
To express how long something lasts or lasted, use por. This is the use most commonly confused with para, because both can follow time-related words. The key distinction: por expresses a period of time (how long); para expresses a point in time (a deadline or due date).
Viví en Madrid por un año.
I lived in Madrid for a year.
Llevan esperando por más de dos horas.
They've been waiting for more than two hours.
Estudiaré por toda la semana.
I'll be studying all week.
Estuvo enferma por varios días.
She was ill for several days.
Por → duration: Viví allí por seis meses. (I lived there for six months.)
Para → deadline: Necesito esto para el viernes. (I need this by Friday.)
Por asks 'how long?'; para asks 'by when?'
Expressing Movement Through a Place
When someone or something moves through, along, or around a place (rather than towards it) use por. This is another key contrast with para, which is used for movement towards a destination. If you're going to Barcelona, that's para; if you're driving through Barcelona en route to somewhere else, that's por.
Paseamos por el centro histórico durante horas.
We walked around the historic centre for hours.
El río pasa por varios pueblos pequeños.
The river runs through several small villages.
¿Puedes entrar por la puerta de atrás?
Can you come in through the back door?
Condujimos por la costa toda la tarde.
We drove along the coast all afternoon.
Indicating Exchange or Substitution
Any time something is given, sold, bought, or exchanged in return for something else, por is used. This includes monetary transactions, swaps, and acting on someone's behalf (doing something in place of someone else).
¿Cuánto pagaste por ese cuadro?
How much did you pay for that painting?
Te cambio este libro por ese.
I'll swap this book for that one.
Lo vendí por mucho menos de lo que esperaba.
I sold it for much less than I expected.
Puedo hacer la presentación por ti si quieres.
I can do the presentation for you (in your place) if you like.
Note the difference between the last example and a para sentence: "Hice esto para ti" (I did this for you, as a gift or recipient) vs "Lo hice por ti" (I did it for your sake / in your place). The distinction matters; and is a common point of confusion in por vs para exercises.
Passive Voice — The Agent "By"
In passive sentences (where something is done to the subject rather than by them) por introduces the agent (the person or thing that performed the action). This is directly equivalent to "by" in English passive constructions.
Este libro fue escrito por Gabriel García Márquez.
This book was written by Gabriel García Márquez.
La casa fue diseñada por un arquitecto famoso.
The house was designed by a famous architect.
La canción fue interpretada por varios artistas.
The song was performed by various artists.
This use of por is one of the most straightforward for English speakers, since "by" in a passive sentence maps cleanly onto por. It also rarely causes confusion with para, since para is never used to introduce a passive agent.
Rate and Proportion
Por is used to express rates, frequencies, and proportions; anywhere you would say "per" in English. This is a use that many learners overlook when first studying por in Spanish, but it appears very frequently in everyday contexts.
El límite de velocidad aquí es noventa millas por hora.
The speed limit here is ninety miles per hour.
Cobra veinte libras por hora de clase.
She charges twenty pounds per hour of tuition.
Voy al gimnasio tres veces por semana.
I go to the gym three times a week.
Esta fruta cuesta dos libras por kilo.
This fruit costs two pounds per kilo.
Times of Day
Por is used with the three main divisions of the day in Spanish. Unlike many other languages, Spanish does not use "in" + article for these expressions; instead, it uses por.
Por la mañana siempre tomo un café.
In the morning I always have a coffee.
Solemos cenar tarde, por la noche.
We usually eat dinner late, in the evening.
La reunión será por la tarde.
The meeting will be in the afternoon.
Por la mañana — in the morning
Por la tarde — in the afternoon / evening
Por la noche — at night / in the evening
Note: these are fixed expressions — always por, never para or en
Common Expressions with Por
Beyond its grammatical uses, por appears in a huge number of fixed expressions and idiomatic phrases in Spanish. Learning these as vocabulary chunks (rather than trying to analyse each one grammatically) is one of the most effective ways to make por feel natural in your everyday speech.
- Por favor - Please
- Por eso - That's why, therefore
- Por fin - Finally, at last
- Por cierto - By the way
- Por ahora - For now
- Por supuesto - Of course
- Por ejemplo - For example
- Por lo menos - At least
- Por lo tanto - Therefore, consequently
- Por si acaso - Just in case
Notice how all of these expressions use por to refer to a reason, a basis, or a cause; even the seemingly simple "por favor" contains the logic of doing something "on account of a favour". Understanding the underlying meaning of por makes even fixed expressions easier to remember and use correctly.
Tips for Remembering When to Use Por
Por has eight uses, which can feel overwhelming at first. These four strategies will help you internalise the rules without having to consciously check a list every time you speak.
If you can replace 'for' in your sentence with 'because of', use por.
✓ 'I thanked her because of her help.' → Gracias por su ayuda.
✓ 'He left because of the noise.' → Se fue por el ruido.
✗ 'I bought it for you.' (= intended for you, not because of you) → Use para: Lo compré para ti.
D — Duration: how long something lasts → por dos horas
R — Reason: why something happened → por amor, por el tiempo
E — Exchange: buying, selling, swapping → por diez euros
A — Agent: passive voice 'by' → escrito por Cervantes
M — Movement / Means: through, along, by phone → por España, por teléfono
Plus: Rate (por hora), Time of day (por la mañana), On behalf of (por ti)
Por favor, por supuesto, por ejemplo, por eso, por fin — these are so common that using them repeatedly will train your ear to the sound and feel of por in natural Spanish.
Once these phrases are automatic, extending por to grammatical uses becomes much easier.
Por in Spanish is best learnt through real conversation with corrective feedback. A Superprof Spanish tutor can identify your specific errors, create targeted exercises, and explain each use in context.
Many tutors offer their first lesson free — search for Spanish tutors on Superprof to find one that suits your level and learning goals.
Test your understanding with the flashcard quiz below. Each card shows a sentence in Spanish with a blank; fill it in with por, then tap to check the rule that applies. All eight uses from this guide are covered.
Once you're comfortable with por on its own, the next step is distinguishing it from para in full sentences. For a complete guide to para and how it differs from por in every context, the second subarticle in this series goes into the same level of depth.
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