MK can refer to several different people or characters, and the height depends on which “MK” you mean.

Here are some common possibilities:

  • MKBHD (Marques Brownlee, tech YouTuber) – He has stated his height as 6'3" (about 191 cm).
  • MK / Monkie Kid (from LEGO Monkie Kid) – Official material does not give a precise human-scale height; fans often speculate he’d be around average height for a young Chinese man, roughly 5'6"–5'8" (about 168–173 cm), but this is not official.
  • MK as “Mortal Kombat” – In this case there is no single height, since it refers to a game series; individual characters each have their own heights.

Because “how tall is mk” is ambiguous, I can’t give a single definitive number without knowing who you mean.

If you tell me which MK you’re asking about (for example, MKBHD, Monkie Kid, a footballer, a YouTuber, or a Mortal Kombat character), I can give a much more precise, focused answer.