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This question already has an answer here:

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.

marked as duplicate by Kramii, jncraton, David Lechner, pcantin, Ambo100 Nov 24 '15 at 18:01

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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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