LMK stands for “let me know”: lmk which evening works for you. It asks for a reply but isn't urgent; a deadline is added separately: lmk by Friday. In chats it's usually lowercase. It's language for texting friends; in a work email, write Please let me know.
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lmk = let me know; lmk if / when / what / which + clause
- lmk which evening works for you and I'll book a table
- I'm taking the car, lmk if you need a lift
- lmk when the parcel arrives
What changed
First versionlmk me when you have the address
Revisionlmk when you have the address
The M in LMK already stands for me, so lmk me says “let me know me”. Drop the extra me and go straight to what you want to hear about: lmk when you have the address.
IDK means “I don't know”: it's an answer, not a request. ASAP means “as soon as possible” and adds the urgency that LMK doesn't have. Lmk when means “tell me when it happens”, lmk if means “tell me if you need it”.
Your turn
I'll book once you decide. ___ which evening you prefer.
Show the answer
lmk — You need lmk: the writer asks to be told which evening works so they can book a table. IMO means “in my opinion” and isn't a request.
Write a short message to a friend with lmk: ask them to tell you one specific choice, and add a deadline if you like.
lmk by Thursday whether you're joining us for the hike
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