What is volumetric weight?
Shipping fees are calculated on the amount of space that your shipment occupies in transit rather than the actual weight, this is called the volumetric weight. The actual weight would only be charged when it is higher than the volumetric weight. You can calculate volumetric weight using the formula: Length * width * height (cm) / 5000 or you can use the calculator here.
For example, a parcel weighs 1 kg, 30 x 30 x 30 cm, the volumetric weight is 5.5 kg. Since the volumetric weight is higher than the actual weight of 1 kg, Couriers DHL and UPS will therefore use 5.5 kg for the shipping rates. It is depending on the Carrier, so it is beneficial to reduce parcel volume to save on shipping costs.