German Phrase
Warum rufst du an?
Meaning
The speaker is asking for the reason behind the other person’s phone call. It literally translates to “Why call you at the end?” but idiomatically it means “Why are you calling?”. The question is informal and assumes a familiar relationship.
When to use
Use this sentence when you pick up the phone or answer a missed call and want to know the caller’s purpose. It works in casual conversations with friends, family, or colleagues you address with *du*.
✦Grammar Breakdown
Warumrufstduan?
Warum (question word)
Used to ask for a reason; it always starts a question and is followed by the verb in second position.
rufst (verb conjugation)
Present‑tense, 2nd person singular of the separable verb *anrufen*; the stem is *ruf‑* and the ending *‑st* marks ‘you’.
du (subject pronoun)
The informal singular pronoun; in questions it follows the verb because German is a V2 language.
an (separable prefix)
In main clauses the prefix of a separable verb moves to the end of the sentence, so *anrufen* becomes *rufst … an*.
🗨In Conversation
Warum rufst du an?
Why are you calling?
Ich wollte dich fragen, ob du am Samstag Zeit hast.
I wanted to ask if you’re free on Saturday.
✕Common Mistakes
Warum rufst du?
Missing the separable prefix *an*; *rufen* alone means ‘to shout’, not ‘to call on the phone’.
Warum rufst du an?
If you’re speaking formally, you must use *Sie* instead of *du*.
↔Alternatives
Weshalb rufst du an?
Why are you calling?
Was ist der Grund für deinen Anruf?
What is the reason for your call?
Warum meldest du dich?
Why are you getting in touch?
Cultural Tip
In German phone etiquette it’s common to start a call with a brief greeting (e.g., *Hallo, hier ist …*) before asking *Warum rufst du an?*. Using the separable verb *anrufen* correctly shows you’re comfortable with everyday German. In formal settings you would replace *du* with *Sie*: *Warum rufen Sie an?*.