Can you settle an argument? I can only find 2 sizes of bricks, Duplo and Classic. My friend swears there is a middle size of Bricks. Help us settle this or we may come to blows.


Besides Classic and Duplo (2x as big in each dimension, hence the name) there are several more official dimensions of LEGO bricks:

  1. Quatro: 2x as big as Duplo in each dimension, so 4x as big as LEGO Classic: http://alpha.bricklink.com/pages/clone/catalogitem.page?P=48201#T=S&O={}

enter image description here

  1. Modulex: Smaller brick width than Classic LEGO (5/8th), and with a 1:1 relation between height and width, whereas Classic LEGO has a 6:5 relation: http://alpha.bricklink.com/pages/clone/catalogitem.page?P=Mx1111L#T=S&O={}maller

enter image description here

  1. Jumbo: Fits in between Duplo and Quatro, 3x LEGO Classic in each dimension: http://alpha.bricklink.com/pages/clone/catalogitem.page?P=x1446#T=S&O={}

enter image description here

  1. Primo: 2x as big as Jumbo in each dimension, hence 6x Classic LEGO: http://alpha.bricklink.com/pages/clone/catalogitem.page?P=31000#T=S&O={}

enter image description here

There are still several more sizes, reported in Dag Bricks' excellent spreadsheet, but they are not similar to normal bricks in form and/or function, such as LEGO Gears, LEGO Soft Bricks and LEGO Tubs and cups.

Here is a comparison picture between all the formats, starting with Modulex and ending with Quatro:

enter image description here

Source used: http://www.dagsbricks.com/2013/09/lego-techniques-system-sizes-wrap-up.html

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