There is often confusion when ordering boxes on the way to measure for them. Many times people have the box faced in the wrong direction when measuring, then the boxes are delivered the size is completely diﬀerent from what they measured for.
For example a 400 x 300 x 250mm box is a completely diﬀerent size than a 300 x 250 x 400mm box.
The measurements of a cardboard box always refer to the internal dimensions of the carton (the usable space), not the external dimensions. This is done to ensure a snug and protective fit around your product.
Depending on the grade and ﬂuting of the cardboard, the internal and external dimensions of a box can diﬀer signiﬁcantly, in some cases even 10mm.
TIP: Remember to leave space for any extra padding you wish to use to protect your product and ﬁnger room to place your product/s into the box. For example, if you are using bubble wrap to cushion the item then you should add at least 5mm to each dimension.
Standard box dimensions are given in the order Length x Width x Height (or Depth).
Make sure to give the dimensions in this order.
Length: is always the longest horizontal measurement or longest opening dimension (unless the box is square i.e length and width are equal).
Width: is the shortest opening dimension.
Height (sometimes referred to as the "depth”): is the vertical dimension of the box when the opening is facing upwards. It always measures distance between TOP and BOTTOM.