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Chargeable Weight
Volumetric weight (also called dimensional weight or DIM weight) is a pricing method used by shipping carriers to account for the space a package occupies, not just its mass. Carriers like DHL, FedEx, and UPS charge based on whichever is greater, the actual weight or the volumetric weight. This means a large, lightweight parcel can cost more to ship than a small, heavy one of the same actual weight.
For ecommerce sellers shipping products across marketplaces, understanding volumetric weight is essential for accurate cost estimation. Without it, you risk underpricing shipping or eroding margins on bulky items like pillows, lampshades, and large packaged goods.
The formula is the same across most carriers. Only the divisor changes:
Volumetric Weight (kg) = (Length × Width × Height in cm) ÷ Divisor
| Carrier / Method | Divisor (cm³/kg) | Example: 40×30×20 cm |
|---|---|---|
| DHL Express | 5,000 | 4.8 kg |
| FedEx International | 5,000 | 4.8 kg |
| UPS Worldwide | 5,000 | 4.8 kg |
| Shopee / Lazada Logistics | 5,000 | 4.8 kg |
| Air Freight (IATA) | 6,000 | 4.0 kg |
| Economy Air (TNT) | 4,000 | 6.0 kg |
Most international couriers and marketplace logistics providers use a divisor of 5,000. Air freight uses 6,000, which means the same box has a lower volumetric weight by air, but air freight rates per kg are usually higher, so the total cost may still be more. Economy services sometimes use 4,000, producing a higher volumetric weight and penalising bulky items more aggressively.
DHL is the carrier sellers ask about most, so it is worth setting out exactly what DHL publishes. For DHL Express, the standard volumetric divisor is 5,000 when dimensions are in centimetres and weight is in kilograms:
DHL volumetric weight (kg) = (Length × Width × Height in cm) ÷ 5,000
DHL also expresses the same rule as a volume key: 1 m³ = 200 kg. That is simply the divisor restated, since 1,000,000 cm³ ÷ 5,000 = 200 kg. DHL then compares the volumetric weight against the actual gross weight of the shipment and bills whichever is greater.
DHL Express illustrates the calculation with a 20 kg shipment measuring 75 × 40 × 40 cm:
The shipment is billed as 24 kg despite weighing 20 kg on the scale. You can reproduce this in the calculator above by entering 75, 40 and 40 with an actual weight of 20 kg on the courier setting.
Shippers working in imperial units will see DHL quote a divisor of 139 rather than 5,000. This is not a different rule, it is the same rule converted. One cubic inch is 2.54³ = 16.387 cm³, so dividing cubic inches by 139 gives a result in pounds that matches dividing cubic centimetres by 5,000. The exact conversion works out to 138.4, and DHL publishes 139 as the rounded working figure, so imperial and metric results can differ by roughly 0.4%. The calculator above converts inches and pounds to centimetres and kilograms before applying the 5,000 divisor, which is why its imperial results track the metric calculation exactly rather than the rounded 139.
One caveat worth knowing: DHL does not publish a single universal rounding increment that applies to every service and country. Rounding of the final chargeable weight is set by the service and rate card you ship on, so confirm it against your own DHL account or rate guide rather than assuming a figure. The divisor itself is also negotiable for high-volume accounts.
Carriers compare the volumetric weight to the actual (gross) weight and charge whichever is greater. This is called the chargeable weight. The logic is simple: carriers have limited space on trucks, planes, and ships. A large, light package takes up space that could be used for heavier cargo, so the carrier charges for the space instead.
For multichannel ecommerce sellers, this distinction matters at every fulfilment step, from importing inventory via international freight to last-mile delivery on platforms like Shopee and Lazada.
Marketplace logistics services calculate shipping fees using volumetric weight internally, even if sellers only see a per-order rate on the surface. Understanding the underlying calculation helps explain why two products of the same mass incur different shipping costs:
Both measure space, but they serve different shipping modes. CBM (cubic metres) is a pure volume measurement used for sea freight pricing, where forwarders quote per CBM for LCL and per container for FCL. Volumetric weight converts that volume into a weight equivalent for courier and air freight billing. If you import inventory by sea, use our CBM calculator for freight quotes, or the container loading calculator to see how many cartons fit in a full container. If you ship parcels via courier or air, use this volumetric weight calculator for accurate cost estimates.
Carriers have limited cargo space on vehicles, aircraft, and ships. A large, lightweight package takes up room that could be used for denser cargo. Volumetric weight pricing ensures carriers are compensated for the space occupied, not just the mass carried. Without it, the economics of transporting bulky goods would not work.
Yes. Volumetric weight and dimensional weight (DIM weight) are the same concept with different names. "Volumetric weight" is the preferred term in international logistics and most markets outside the United States. "Dimensional weight" is more common in US domestic shipping. The formula and divisors are identical.
DHL Express divides length × width × height in centimetres by 5,000 to get volumetric weight in kilograms, which DHL also states as a volume key of 1 m³ = 200 kg. It then charges whichever is greater, the volumetric weight or the actual gross weight. DHL's own example is a 20 kg shipment measuring 75 × 40 × 40 cm: 120,000 cm³ ÷ 5,000 = 24 kg volumetric, so the shipment is billed at 24 kg. In inches and pounds DHL quotes the equivalent divisor of 139.
Most international couriers (DHL Express, FedEx International, UPS Worldwide) use a divisor of 5,000 when dimensions are in centimetres and weight is in kilograms, or 139 when dimensions are in inches and weight is in pounds. Air freight follows the IATA standard of 6,000. Some economy services use 4,000. Always check your carrier contract, as high-volume shippers may have a negotiated divisor.
Right-size your packaging to eliminate excess space, use poly mailers instead of boxes for non-fragile items, vacuum-seal soft goods, and negotiate a higher divisor with your carrier. For multichannel sellers managing inventory across platforms, tracking package dimensions in your inventory management system helps identify which products consistently incur volumetric surcharges.