What LEGO Piece Is This?

How to identify a LEGO piece

1. Count the studs. Across, then along: a 2x4 has two rows of four. For a tall piece, the height in bricks or plates helps too.
2. Say what kind of piece it is. A brick is tall, a plate is a third as tall, a tile is a plate with a smooth top, a slope has a slanted face. Technic pieces have round or cross-shaped holes.
3. Add anything unusual. A clip, a hinge, a hole, a curve, a printed picture. A catalog colour you name carries over to each Which sets have it? link, except light and dark gray, names retired in 2004 that most people now use for the bluish grays.
4. Pick yours from the pictures. The page shows up to 24 parts, closest first, with the number molded into many of them.

How accurate is it?

We chose 36 pieces at random, common pieces as often as they turn up in sets, from the 63,251 parts in the catalog, and described each from its picture without reading its name or number first. Measured November 03, 2026. With this few pieces, take the counts as a rough guide.

What it cannot do

It reads the catalog’s name for each part, so a piece whose name uses other words than yours can be missed: a describer’s “ridges” is the catalog’s “notched”. It does not look at photos, and it does not know which printed design is on a piece. The tool itself saves nothing, but your description travels in the page’s address, which the site’s analytics note as they do for any page.