Let me know vs Tell me

When to use each in English, with meaning, register, and examples.

Let me know

Top 1,000 (very common)

Tell me

Top 1,000 (very common)
 Let me knowTell me
Pronunciation🇬🇧 //lɛt miː nəʊ//🇺🇸 //lɛt mi ˈnoʊ//🇬🇧 //tɛl miː//🇺🇸 //tɛl mi//
MeaningTell me when you have information.Say something to someone
ExamplePlease let me know if you can come to the party.Please tell me what happened at the meeting.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
Collocationslet me know, let us know, let him knowtell me the truth, tell me about it, tell me your name, tell me what you think, tell me a story
Antonymskeep me in the dark, withhold information-
Common mistakesUsing 'let me knowed' instead of 'let me know'., Confusing with 'let me knew'., Overusing in formal contexts where more formal phrases are expected.'Tell me' + a complete sentence is incorrect. It should be followed by what you want to know., Confusing 'tell' with 'say'. Use 'tell' when giving information to someone.
Usage notesCommonly used in casual and formal conversation. Best for requesting updates or information. Avoid in very formal writing.Often used in both formal and informal contexts, but can be overly direct in sensitive situations. Use with care.

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Let me know
Tell me

Frequently asked questions: Let me know vs Tell me

What's the difference between Let me know and Tell me?

Let me know: Tell me when you have information. Tell me: Say something to someone

Can you show an example of each?

Let me know: Please let me know if you can come to the party. Tell me: Please tell me what happened at the meeting.

Can I use Let me know and Tell me interchangeably?

Not always. Let me know and Tell me are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.