Girth and volumetric weight calculator. Easy to use. In preparing your parcels please note the following max. dimensions: Length: 175 cm (longest side) Combined dimensions: 300 cm (2 x height + 2 x width + longest side) Weight: 31.5 kg Combined dimensions The DPD girth and volumetric weight calculator below this text will help you find out quickly and simply if your parcel is within the limit for combined dimensions. Volumetric weight The charge for air freight is based on the parcel's volumetric weight, if this is greater than the actual weight in kg. The volumetric weight indicates how much space a parcel takes up in relation to its weight, and is calculated on the basis of the TACT rules operated by IATA (International Air Transport Association)using the following formula: Length x width x height in cm / 6.000 The volumetric weight applies both to road transport and air parcel shipping.