How to Measure A Box

How to Measure A Box

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.

Internal vs External Dimensions

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.

Length x Width x Depth

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.

Click to download this guide as a PDF

Back to News & Information

Join our newsletter to receive exclusive special offers!