How many studs does a standard LEGO 2-by-4 brick have?

A standard LEGO 2-by-4 brick has eight studs.

The name “2-by-4” describes the brick’s footprint: two studs across and four studs long. Multiplying those dimensions gives eight studs on its top surface. These studs connect with the undersides of other LEGO elements, allowing bricks to lock together into stable constructions.

The 2-by-4 brick is one of the best-known LEGO elements and is often used to demonstrate the basic geometry of the LEGO building system. Its proportions also help explain how different brick sizes fit together on a common grid. A 2-by-2 brick has four studs, while a 1-by-4 brick has four.

The number of studs is not the same as the number of internal tubes or the total number of plastic components in a brick. Standard bricks typically have hollow undersides with internal structures that help create the characteristic clutch connection between pieces.