How big is a plate LEGO® part?
The exact size of a plate — length, width, and height in mm, inches, and cm — with the math and a to-scale diagram.
Exact dimensions
Length (2 studs)
15.8 mm
Width (4 studs)
31.8 mm
Height
3.2 mm
plate height
The math
length = 2 × 8 − 0.2 = 15.8 mm · width = 4 × 8 − 0.2 = 31.8 mm · height = 3.2 mm
Common plate sizes
| Size | Length | Width | Height |
|---|---|---|---|
| 1×1 plate | 7.8 mm | 7.8 mm | 3.2 mm |
| 1×2 plate | 7.8 mm | 15.8 mm | 3.2 mm |
| 2×4 plate | 15.8 mm | 31.8 mm | 3.2 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.