The inside dimensions of a box are critical for proper fit around the product. Box manufacturing is base on this fit. At the same time, outside dimensions must be considered for proper palletization and distribution.

Dimensions can be stated in metric units or in inches and fractions.

Dimensions are alwayss given in the sequence of length, width and depth. International organizations use the words length, breadth and height.

Length is always the larger of the two dimensions of the open face of a box as it is set up for filling. Width is the smaller dimension of the open face. Depth is the distance perpendicular to the length and width.

End-opening boxes are measured as though they were top-opening. Boxes with multiple parts, such as telescope styles, may have different dimensions for each part. Box styles that do not have a manufacturer's joint such as wrap-arounds, are measured as they will be after the user's joint (the first closure) has been sealed.

Tubes and folders with three dimensions are measured in the same way as boxes, with length being the larger of the two dimensions of the open face, and width the smaller.

The first of the two dimensions of pads, partition pieces and sheets has the greater stacking strength, that is, parallel to the flute direction of corrugated board, or perpendicular to the grain of soild fibreboard.