LEGO® bricks are measured in a variety of ways. How to create or fill a space of a particular size is a common building concern.

LEGO® bricks are commonly measured in three possible units:

  • Lego Unit (LU): A brick is 6 Lego units tall; a plate is 2 Lego units tall. Studs are placed 5 Lego units apart.
  • LDraw Units (LDU), used by LDraw modeling tools. There are Four LDUs in an LU.
  • Standard metric: One Lego unit slightly below 1.6mm.
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