Volumetric Weight Explained
Why your 1 kg pillow might be charged at 18 kg — and how to avoid paying more than you should.
The Formula
Example: A box 50×40×30 cm weighing 3 kg: volumetric = 50×40×30÷5000 = 12 kg. You pay for 12 kg, not 3 kg.
Real-World Examples
| Item | Vol. Weight | Actual | Charged |
|---|---|---|---|
Laptop (30×25×5 cm, 2.5 kg) Actual wins — dense item | 0.75 kg | 2.5 kg | 2.5 kg actual |
Pillow (60×50×30 cm, 1 kg) Volumetric wins — bulky/light | 18 kg | 1 kg | 18 kg volumetric |
Shoes (35×25×15 cm, 1.5 kg) Volumetric wins — common trap | 2.6 kg | 1.5 kg | 2.6 kg volumetric |
Books (30×20×20 cm, 5 kg) Actual wins — dense item | 2.4 kg | 5 kg | 5 kg actual |
Bubble wrap roll (50×30×30 cm, 0.3 kg) Massive volumetric premium | 9 kg | 0.3 kg | 9 kg volumetric |
How to Reduce Volumetric Weight
Use the smallest box that safely fits your item with adequate padding. Every cm saved on each dimension reduces volumetric weight significantly.
Compress clothing and soft goods in vacuum compression bags before boxing — reduces box height dramatically.
Cut down over-tall box flaps or choose a lower-profile box — box height is the easiest dimension to reduce.
Use poly mailers instead of boxes for soft goods — mailers have almost zero volumetric overhead.
Measure your packed box precisely before booking — errors in dimensions lead to surprise invoices after delivery.
FAQ
What is volumetric weight?
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Volumetric weight (also called dimensional weight or DIM weight) is a pricing technique used by couriers when a parcel takes up more space relative to its actual weight. Carriers charge the greater of actual weight or volumetric weight. The formula is: Length × Width × Height (in cm) ÷ 5000 = volumetric weight in kg (DHL, FedEx, UPS standard). Some carriers use ÷ 4000 for express services.
Why do couriers charge by volumetric weight?
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Courier networks have limited space in vans, planes and sorting facilities. A bulky lightweight box occupies the same space as a heavy box but contributes less revenue by actual weight. Volumetric pricing ensures carriers are compensated fairly for the space occupied, not just the weight.
How can I reduce my volumetric weight?
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Use the smallest box that safely fits your items — every centimetre saved reduces volumetric weight. For soft goods, use poly mailers or compression bags. For multi-item shipments, consolidate into one well-packed box. Cut down box flaps that extend the height unnecessarily.
Is volumetric weight the same for all carriers?
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No. Most couriers use Length × Width × Height ÷ 5000 (DHL, UPS, FedEx). Some use ÷ 4000 for express or air services (making them more sensitive to dimensions). GLS and DPD may use different divisors. Cargosender applies each carrier's correct formula when calculating quotes.
Does volumetric weight apply to sea freight?
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Sea freight is typically priced by CBM (cubic metre) rather than volumetric weight, so bulky goods are expected to fill volume. For LCL shipments, you pay per CBM or per tonne, whichever is greater. The principle is similar — light but bulky cargo pays by volume.
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