Expressing purpose with damit and um ... zu

In brief

To say why someone does something, German uses damit or um … zu. Both express an intended result: ‘so that’ or ‘in order to’. Choose based on who performs the action in the purpose part.

Form

Main clause + comma + damit + subject + … + conjugated verb at the end; or main clause + comma + um + … + zu + infinitive.

Usage

• Use um … zu when the person doing both actions is the same. The second part does not repeat the subject.
• Use damit when the person or thing carrying out the intended action is different. The damit clause has its own subject.
• With damit, the conjugated verb goes to the end of its clause. Put a comma before either purpose expression.

Examples

• Ich spare Geld, um mir ein Fahrrad zu kaufen. — I’m saving money to buy myself a bike.
• Wir fahren früher los, damit die Kinder pünktlich ankommen. — We’re leaving earlier so that the children arrive on time.
• Ich lerne jeden Tag, damit ich die Prüfung bestehe. — I study every day so that I pass the exam.

Common mistake

❌ Ich öffne das Fenster, um die Kinder frische Luft zu bekommen.

✅ Ich öffne das Fenster, damit die Kinder frische Luft bekommen.

The children, not the speaker, get the fresh air. Use damit with a separate subject when the intended action has a different doer.

Remember

Same doer: um … zu. Different doers: damit.