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German Phrase

Wie ist deine Kundennummer?

/viː ɪst ˈdaɪ̯.nə ˈkʊn.dənˌnʊmɐ/
Meaning"What is your customer number?"
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Meaning

This sentence asks someone to give the number that identifies them as a customer in a company's system. It is a direct, informal way to request that piece of information.

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When to use

Use it in informal business settings – e.g., when speaking with a colleague, a friend who works for a company, or a customer you already know well. In formal contexts you would switch to the polite ‘Sie’ form.

✦Grammar Breakdown

WieistdeineKundennummer?

1

Wie (question word)

‘Wie’ introduces a yes‑no or information‑seeking question and translates to ‘how’ or ‘what’ in English.

2

sein – ist (to be)

‘ist’ is the 3rd‑person singular present of ‘sein’. In questions it works like the English ‘is/are’.

3

deine (possessive adjective)

‘deine’ agrees with the feminine noun ‘Kundennummer’; use ‘dein’ with masculine/neuter nouns.

4

Kundennummer (compound noun)

A compound noun formed from ‘Kunde’ (customer) and ‘Nummer’ (number). The main noun is ‘Nummer’, which is feminine.

🗨In Conversation

A

Wie ist deine Kundennummer?

What is your customer number?

Meine Kundennummer ist 123456.

My customer number is 123456.

B

✕Common Mistakes

  • Wie ist dein Kundennummer?

    ‘Kundennummer’ is feminine, so the possessive must be ‘deine’, not ‘dein’.

  • Wie ist deine Kunden Nummer?

    In German compound nouns are written together; splitting creates a grammatical error.

  • Wie ist deine Kundennummer?

    While understandable, native speakers more often use ‘Wie lautet…’ for numbers and codes.

↔Alternatives

  • Wie lautet deine Kundennummer?

    What is your customer number?

  • Könntest du mir deine Kundennummer nennen?

    Could you tell me your customer number?

  • Darf ich Ihre Kundennummer haben?

    May I have your customer number? (formal)

de

Cultural Tip

German business communication distinguishes clearly between informal (du) and formal (Sie) address. If you are not sure about the relationship, use the polite form: “Wie ist Ihre Kundennummer?” or “Wie lautet Ihre Kundennummer?”. Also, Germans appreciate precision – have the number ready and state it without hesitation.