What Does “LMK” Mean

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“LMK” means “let me know.” It’s a short, casual way to ask someone to tell you something later or give you an update.

People use LMK in text messages, chats, emails, and social media when they want a quick, friendly reply. For example, someone might say, “LMK if you’re free tonight,” which means they want you to tell them if you can make it.

Meaning & Usage

LMK is common in everyday conversation online. It sounds casual and natural, so people often use it with friends, family, or coworkers in informal messages.

Examples

“LMK when you arrive.”
“LMK if you need help.”
“LMK what time works for you.”

Is LMK formal?

No. LMK is informal, so it’s best for casual messages rather than professional writing.

Can LMK be used in email?

Yes, but mainly in short or casual emails. In formal emails, it’s better to write “let me know.”