French · Real conversations
How to say “I'll let you know.” in French
Promise to give the other person an update.
Je te tiens au courant.
I'll let you know.
Say what you will confirm or when you expect to know if that detail matters.
Use it in three situations
Confirming availability
Je te tiens au courant.
I'll let you know.
Checking a detail
Je te tiens au courant demain.
I'll let you know tomorrow.
Following up on a plan
Je te préviens quand j'arrive.
I'll let you know when I arrive.
What to watch for
Do not use this alone when the other person needs a confirmed answer immediately.
Read the whole expression before replacing a detail. The natural wording may use a different order or construction from the English sentence.
Your turn
Imagine changing plans. Say this in French: I'll let you know tomorrow.
Reveal a sample reply
Je te tiens au courant demain.
I'll let you know tomorrow.
Build a useful exchange
Explain a change and offer a clear next step.
This expression in other languages
A note on speaking French
Use vous with strangers, staff, and people you address formally; use tu when that relationship is established. Je voudrais and pourriez-vous can make a request considerate. The most appropriate choice depends on the person and the situation.
Keep accents and apostrophes. A familiar spoken expression may differ from its literal English translation. Read the complete line, including the pronoun and the words that connect the request.
