Air Freight Chargeable Weight: Why Your Invoice Isn’t Based on Actual Weight

A common surprise for first-time air freight shippers is seeing an invoice based on a weight that doesn’t match what the scale said. This isn’t an error — air freight is billed on whichever is greater: actual weight or volumetric (dimensional) weight.

How Volumetric Weight Is Calculated

Volumetric weight is based on the space a shipment takes up in the aircraft, calculated from its dimensions using a standard industry formula. For light but bulky cargo — think inflatable products, packaging, or foam-padded items — the volumetric weight can end up well above the actual scale weight.

Why Airlines Price It This Way

Aircraft cargo holds are limited by both weight and space. A shipment that’s light but takes up a lot of room uses capacity that a denser, heavier shipment could otherwise fill, so pricing reflects whichever constraint the shipment actually hits.

How to Estimate Your Own Chargeable Weight

Ask your forwarder for the exact volumetric weight formula they use and apply it to your cargo’s packed dimensions before committing to air freight, so there are no surprises on the invoice. If your cargo is bulky relative to its weight, it’s worth asking whether sea freight might actually work out cheaper — see our cost breakdown for importing from China or ask us to calculate both for your shipment.