will let you know

USAGE SUMMARY

"will let you know" is correct and usable in written English.
You can use this phrase to let someone know that you will provide them with an update on something later. For example, "I need to check with my boss before I can give you an answer. I will let you know by tomorrow."

✓ Grammatically correct

News & Media

Academia

Science

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

I will let you know.

The New York Times

Someone will let you know".

The New York Times - Sports

The Bagger will let you know.

The New York Times

I will let you know what happens.

The New York Times

"But the marketplace will let you know.

The New York Times - Sports

"We will let you know," Clément said.

The Guardian - Sport

"I will let you know when it happens," he said.

The New York Times

Blow it, and they will let you know.

The New York Times

I will let you know when I receive the answer.

The New York Times

"The audience will let you know," he said.

The New York Times

If the car needs help, it will let you know.

Yale University

Expert writing Tips

Best practice

When using "will let you know", be sure to set realistic expectations about when the information will be provided to maintain trust and avoid frustrating the recipient.

Common error

Avoid using "will let you know" without providing any indication of when the information will be available, as it can leave the recipient feeling uncertain. Instead, specify a timeframe, such as "I will let you know by the end of the day."

Linguistic Context

The phrase "will let you know" functions as a promise or assurance that the speaker intends to provide information to the listener at a later time. As Ludwig AI confirms, it is usable in written English to indicate a future update.

Expression frequency: Very common

Frequent in

News & Media

40%

Academia

30%

Science

10%

Less common in

Wiki

10%

Formal & Business

5%

Reference

5%

Ludwig's WRAP-UP

In summary, "will let you know" is a very common and grammatically correct phrase used to assure someone that you will provide them with information in the future. As Ludwig AI points out, this phrase is widely applicable across various contexts, from News & Media to Academia, maintaining a neutral register. For alternative phrasing, consider options like "I'll inform you later" or "I'll keep you updated", depending on the specific nuance you want to convey. When using this phrase, always set realistic expectations about timing to maintain clarity and trust.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

I'll inform you later

More concise and slightly less formal.

I'll keep you updated

Implies a series of updates rather than a single instance.

I'll get back to you

Suggests a response to a query or request.

I'll update you on that

More direct, indicating a specific piece of information.

I'll notify you when available

Specifically related to availability of something.

I'll advise you accordingly

More formal, suggesting guidance based on information.

I'll communicate the details

Emphasizes the transfer of specific information.

You'll hear from me soon

Less specific about the content, focuses on the timing.

I'll be in touch

General expression indicating future communication.

I'll reach out with more information

Emphasizes the effort to contact with details.

FAQs

How can I use "will let you know" in a sentence?

You can use "will let you know" to indicate that you will provide someone with information at a later time. For example, "I'm waiting for confirmation, but I "will let you know" as soon as I hear back."

What's a more formal alternative to "will let you know"?

For a more formal tone, consider using phrases like "I will inform you", "I will advise you accordingly", or "I will update you on that" depending on the context.

Is it okay to use "will let you know" in professional emails?

Yes, "will let you know" is acceptable in most professional email communications. However, ensure that the level of formality matches the overall tone of the email and relationship with the recipient.

What's the difference between "will let you know" and "will get back to you"?

"Will let you know" generally implies providing information, while "will get back to you" suggests responding to a question or request. Although these alternatives have a subtle difference, it is worth noting that the intended meanings are highly close and might be considered the same.