How big is a LEGO® baseplate?
Exact baseplate footprints (16×16, 32×32, 48×48) computed from the 8 mm stud grid, in mm, inches, and cm.
Exact dimensions
Length (32 studs)
256 mm
Width (32 studs)
256 mm
Thickness
varies
baseplates have no single standard thickness
The math
length = 32 × 8 = 256 mm · width = 32 × 8 = 256 mm (baseplates butt edge-to-edge, so no gap)
Common baseplate sizes
| Baseplate | Length | Width |
|---|---|---|
| 16×16 studs | 128 mm | 128 mm |
| 32×32 studs | 256 mm | 256 mm |
| 48×48 studs | 384 mm | 384 mm |
Brick-dimension calculator
Change the part type or stud counts to size any regular brick, plate, or tile.
Footprint = studs × 8 mm − 0.2 mm gap. Brick height 9.6 mm, plate/tile height 3.2 mm. Use the unit buttons above to switch mm / inches / cm.
How these numbers are computed & sources
- Every length is the stud count × the 8 mm stud pitch, minus a 0.2 mm part gap (real parts run slightly under pitch so they clutch and release; baseplates butt together with no gap).
- Brick height is 9.6 mm; a plate (and a tile) is 3.2 mm — exactly one third of a brick.
- Stud diameter 4.8 mm, stud height 1.8 mm. Inches = mm ÷ 25.4; cm = mm ÷ 10.
- These are computed from the standard LEGO System measurements, not an official spec sheet; nominal values, not a tolerance guarantee.
Sources:
- LUGNET building-dimensions FAQ (stud pitch 8 mm, brick height 9.6 mm, plate height 3.2 mm).
- LDraw.org File Format spec: 1 brick = 20x20x24 LDU, 1 plate height = 8 LDU, stud diameter = 12 LDU, with 1 LDU = 0.4 mm exactly.
- bricks.stackexchange.com 'dimensions of a LEGO brick' (3 plates = 1 brick; stud diameter 4.8 mm; ~0.1 mm play).
- Orionrobots LEGO specifications table (stud pitch 8 mm, plate 16/5 mm, brick 48/5 mm).
Last reviewed: 2026-06-22.