Volumetric weight from the box, the billed weight after rounding and the freight cost
Volumetric weight is length × width × height ÷ divisor, and the chargeable weight is the larger of that and the scale weight, rounded up to the courier's billing step (0.5 or 1 kg). A ratio above 1 means the parcel is bulky for its weight — shrinking the packaging saves more than haggling on rate. Real invoices also add first-kilo pricing, remote-area surcharges and fuel, so this is the base freight only.