What LEGO Set Is This From?

How to find out what set your LEGO pieces came from

1. Pick the odd ones out. Printed pieces, unusual shapes and unusual colours say far more than a plain brick, which thousands of sets share.
2. Find each one. Many pieces have a small number molded into them, often on the underside. Type it in, or search by name, or describe the piece in your own words. Not every piece has a number.
3. Choose its colour. The colour does most of the work. A close guess still counts, because easily confused colours earn partial credit.
4. Read the result. The page ranks sets by the pieces they contain, and says when several sets fit equally well. Then check whether your box is complete with the Missing Piece Checker.

When the box mixes several sets

List pieces from all over the box. Once the best set is found, the pieces it explains are set aside and the rest are ranked again, up to 3 sets. A later set needs at least 3 pieces, because one stray piece fits too many sets to mean anything.

How accurate is it?

We replayed the tool on 150 random sets from the 19,905 with parts on file, choosing pieces from each and adding the mistakes people make. This is a simulation on catalog data, measured October 31, 2026, not a trial with real boxes, which can be harder. With this many sets, a difference of a few points between rows is chance.

• Two sets mixed, 8 pieces: every set named in 85% of boxes.
• Three sets mixed, 12 pieces: every set named in 59% of boxes.

What it cannot tell you

It compares your pieces with each set's latest parts list, and counts each listed piece once. It cannot say whether a box is complete from this list alone, and a box of common bricks may fit many sets equally well. Minifigures are not counted. Your list stays in the page's address and is not saved.