What is the standard size of a modular brick?

The standard size of a modular brick is indeed 4" x 2/3" x 8". This size is significant because it accounts for the nominal dimensions used in masonry construction, where the modular brick dimensions are defined to allow for easier calculations when working with mortar joints.

In practice, the 2/3" height translates to approximately 0.667", which, when combined with the thickness of mortar joints, aligns with the typical 4" height and 8" length to ensure a consistent overall height for walls when multiple bricks are used. This modular sizing aids in keeping structures leveled and uniform when built up, ensuring that calculations related to quantity and layout are simplified for builders and architects.