# LMK Meaning: What It Means in a Text (and How to Reply)

> LMK means "let me know". Learn what LMK means in a text from a guy or a girl, if it is interest or a polite brush-off, and how to reply to LMK.

Source: https://thecringe.app/meaning/lmk · Updated 2026-10-22

**Short answer:** LMK means "let me know". It asks you to answer, decide or give an update. From a crush it is neutral: "lmk when you're free, I want to see you" is a good sign, but a bare "lmk" can be a polite way to put all the effort on you.

## What does LMK mean?

LMK is short for "let me know". It is very common in plans and everyday logistics:

- "lmk if you're coming tonight"
- "lmk when you get home"
- "lmk what you think"

It is not exactly a question, but it waits for an answer. Some people add "asap" when they need it fast.

## What does LMK mean from a guy?

From a guy, LMK can be sweet or passive. "lmk when you get home safe" shows care. "lmk when you're free" means he wants to see you but wants you to pick the time, which can be respect or low effort.

If he says lmk and then really shows up when you answer, good sign. If you let him know and he goes quiet, that hurts, and our post on being [left on read](https://thecringe.app/blog/left-on-read) can help you read it.

## What does LMK mean from a girl?

From a girl, LMK is often practical and polite. "lmk if you want to come" is a clear invitation. She is being open without pushing. With a smiley or a personal detail ("lmk, I'd really like you there 😊"), it is warmer.

## Is LMK a good sign?

It depends on what they want you to let them know:

- **Good:** "lmk when you're home" or "lmk how the interview goes". They care about your life.
- **Neutral:** "lmk about Saturday". Normal planning.
- **Low effort:** they never suggest anything, they only say "lmk if you want to hang out". You do all the planning.
- **Late night:** "lmk if you're still up" can be a "u up" text in politer words.

Also notice how fast they reply once you do let them know. Our post on [reply time meaning](https://thecringe.app/blog/reply-time-meaning) explains what slow and fast replies can say.

## How to reply to LMK

**Flirty:**

- "letting you know: yes 😌"
- "I'll lmk... if you ask nicely"

**Friendly:**

- "will do! probably around 8"
- "yes I'm in! what time?"

**Busy:**

- "I'll lmk tomorrow, still checking my schedule"
- "not sure yet, will text you tonight"

**Not interested:**

- "I'll see"
- "probably can't, sorry"

The kindest reply is a clear one. A vague "maybe" for days is harder on the other person than a polite no.

## LMK in your WhatsApp chat

Planning chats show who makes the effort. The Cringe report shows who starts conversations, each person's top words and average reply times, so you can see if "lmk" means shared planning or one person always waiting for the other.

**Stop guessing. Check your real chat.** Drop your WhatsApp export and see who texts first, who replies faster and who cares more. Free to upload with no sign-up. Your copy is encrypted and you can delete it anytime. [Analyze my chat for free](https://thecringe.app)

## FAQ

### Is LMK rude?

No. It is a normal, polite way to ask for an answer. It only feels cold when it is the whole message.

### What does LMK mean from a guy you're dating?

Usually it is planning or care, like "lmk when you get home". If he always leaves the plans to you, talk about it.

### What is the difference between LMK and HMU?

LMK asks for information or an answer. HMU ("hit me up") asks you to contact them in general.