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Calculate actual weight, volumetric weight, and chargeable weight for air, sea, and road freight shipments.
Carriers charge based on the greater of actual weight or volumetric (dimensional) weight. Different transport modes use different DIM factors: Air (6000), Road (3000), Sea (CBM-based).
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Key figures every shipper and freight forwarder should know
Shipping weight is the measurement carriers use to determine freight charges. There are two types: actual weight — the true physical mass of a shipment measured on a scale — and volumetric (dimensional) weight, a calculated value based on package dimensions that reflects the space consumed in a vehicle or aircraft.
Carriers use the concept of chargeable weight, which is simply whichever is greater: actual weight or volumetric weight. This ensures that a 1 kg feather pillow in a huge box pays proportionally to the space it occupies, just as a small dense block of metal pays for its mass.
Understanding this mechanism is crucial for cost planning. Businesses that optimize packaging dimensions — trimming even 5 cm from each side — can reduce volumetric weight significantly and cut shipping costs on every single shipment.
Result in kilograms. IATA DIM divisor 6,000 is the international standard for air cargo.
Result in kilograms. Road freight uses 3,000 as the DIM divisor — twice as sensitive to size as air.
Carriers always bill the greater of the two weights. Minimize packaging to reduce volumetric weight.
| Feature | Air Freight | Road Freight | Sea Freight |
|---|---|---|---|
| DIM Divisor | 6,000 | 3,000 | N/A (uses CBM) |
| Pricing Basis | Chargeable weight (kg) | Chargeable weight (kg) | CBM or freight ton |
| DIM Factor (kg/m³) | 166.67 | 333.33 | 1,000 |
| Minimum Charge | Typically 1 kg | Varies by carrier | Often 1 CBM |
| Typical Range | 1 kg – several tons | Up to 24 tons (FTL) | Up to 25,000 tons |
USPS first introduces dimensional weight pricing for parcel post
Containerization revolution standardizes cargo measurements globally
IATA standardizes the 6,000 DIM factor for international air cargo
FedEx extends DIM pricing to domestic ground services
UPS and FedEx apply DIM pricing to ALL shipments — a major industry shift
Average volumetric-to-actual weight ratio exceeds 2:1 for e-commerce
DIM factor standards and best practices for international air freight billing.
View Source →161 billion parcels shipped globally — trends in volumetric vs actual weight.
View Source →Landmark shift applying volumetric pricing to all parcel shipments in 2015.
View Source →I only pay for the actual weight of my package
Since 2015, most carriers charge the GREATER of actual or dimensional weight — a 1 kg item in a large box will be charged volumetrically.
The DIM formula is the same for all carriers
Divisors vary: air freight uses 6,000, road uses 3,000, some express carriers use 5,000. Always confirm with your specific carrier.
Sea freight is always cheapest for heavy cargo
For urgent or high-value shipments under 100 kg, air freight's speed can create more value than the cost premium — calculate total cost including inventory holding.
Packing in a smaller box doesn't matter once it's weighed
Right-sizing packaging reduces dimensional weight, lowers shipping costs by 20–40%, and improves container utilization.
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