LMK is a workhorse phrase. It asks the other person to come back with a reply, a decision, an availability — anything that needs a response when they have one.
Friendly across all registers: casual DMs, work chats, customer-service replies. “Lmk if Saturday works”, “lmk what you think”, “lmk when you’re close”.
Lowercase by default.
Examples
How LMK reads in the wild.
- “lmk if you want me to save you a table”
- “lmk what time works for the call this week”
Where you’ll see it
Common questions
What does LMK mean?
LMK stands for "Let Me Know". Short for “let me know” — the most-used phrase in DMs and group chats.
How is LMK used?
LMK is a workhorse phrase. It asks the other person to come back with a reply, a decision, an availability — anything that needs a response when they have one. Friendly across all registers: casual DMs, work chats, customer-service replies. “Lmk if Saturday works”, “lmk what you think”, “lmk when you’re close”. Lowercase by default.
Where will I see LMK?
LMK is commonly used on iMessage, Slack, Instagram DMs, WhatsApp.