Prices (air freight rates) are always quoted per kg/6 dm3. This can also be called the volume ratio 1 : 6 or 1 m3 = 167 kg. That means you either pay for the weight or the space necessary for the transport of your consignment.
The calcuation is always based on the following equation regardless of whether you are paying for the weight or the space:
Length (cm) x width (cm) x height (cm) / 6000 (equals the volume weight in kg)
|Air freight||1 m3 = 167 kg|
|Truck||1 m3 = 333 kg|
|Sea freight||1 m3 = 1,000 kg|