let me know when

USAGE SUMMARY

The part of the sentence "let me know when" is perfectly correct and usable in written English.
You can use this phrase to ask someone to inform you at a future point in time of something. For example: "Let me know when you need help moving."

✓ Grammatically correct

News & Media

Academia

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Let me know when you're ready".

The New York Times

Let me know when you're finished.

The New Yorker

Let me know when it sinks in".

The Guardian - Film

"Let me know when you get to Agadez," he said.

The Washington Post

Just let me know when you miss me ;-)".

The Guardian - Tech

"Let me know when the service will be".

The New Yorker

Let me know when we can catch up.

The Guardian

Let me know when you have an answer.

The Guardian - Opinion

He always let me know when I got it right".

The New York Times - Arts

No, and let me know when someone strings that together.

The Guardian - Opinion

You all just let me know when you're ready to laugh.

The New Yorker

Expert writing Tips

Best practice

When using "let me know when", be specific about what you want to be informed about to avoid ambiguity.

Common error

While versatile, avoid overusing "let me know when" in highly formal or academic writing. Opt for more formal alternatives like "please inform me when" or "kindly notify me when" in those scenarios.

Linguistic Context

The phrase "let me know when" functions as an imperative requesting information. As Ludwig AI confirms, it is a perfectly correct and usable phrase. Its primary function is to prompt someone to provide an update or notification upon the occurrence of a specific event or at a particular time.

Expression frequency: Very common

Frequent in

News & Media

36%

Academia

27%

Formal & Business

18%

Less common in

Science

9%

Encyclopedias

5%

Wiki

5%

Ludwig's WRAP-UP

The phrase "let me know when" is a versatile and widely used expression for requesting information at a later time. As Ludwig AI confirms, this phrase is grammatically sound and appropriate for various contexts. It is most frequently encountered in News & Media, Academia, and Formal & Business settings. While generally neutral in tone, more formal alternatives should be considered for highly formal or scientific communications. By understanding its function, purpose, and appropriate register, you can effectively use "let me know when" to communicate your need for future updates or notifications.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

Tell me when

This is a more direct and concise way of asking for notification.

Notify me when

A slightly more formal synonym for 'tell me'.

Please inform me when

This is a more formal way of asking someone to notify you.

Inform me as soon as

This adds a sense of urgency to the request.

Alert me when

Implies the situation is urgent or important.

Keep me updated on when

This suggests a series of updates rather than a single notification.

Let me have an update when

Similar to 'keep me updated', implying you want progress reports.

Give me a heads-up when

This is an informal way of asking for a warning or notification.

Get in touch when

This is a more generic way of asking someone to contact you.

Drop me a line when

This is an informal way of requesting contact, often via email.

FAQs

How can I use "let me know when" in a sentence?

You can use "let me know when" to ask someone to inform you about something at a later time. For example, "Let me know when you're available for a meeting" or "Let me know when the report is finished".

What's a more formal alternative to "let me know when"?

For more formal situations, you can use phrases like "please inform me when" or "kindly notify me when". These options are suitable for professional or academic correspondence.

Is it okay to use "let me know when" in an email?

Yes, "let me know when" is perfectly acceptable in emails, especially in professional or casual communications. However, consider using a more formal alternative like "please inform me when" for very formal correspondence.

What's the difference between "let me know when" and "tell me when"?

"Let me know when" and "tell me when" are quite similar, but "let me know when" is generally considered more polite. "Tell me when" is more direct and can sometimes sound demanding depending on the context and tone.