Chargeable weight explained: why light, bulky freight costs more

A trailer runs out of space long before it runs out of payload for most general cargo. A load of cushions can fill the deck while weighing almost nothing, so if it were billed on scale weight alone it would travel nearly free while blocking paying freight. Chargeable weight fixes that by pricing the space a load really occupies.

Each transport mode has a conversion factor between volume and weight. For European road freight the common factor is 1 cubic metre equals 333 kg — equivalently, 1,000 kg fills about 3 m³. Multiply your load's volume in cubic metres by 333 to get its volumetric weight in kilograms.

The factor reflects how much a trailer can carry by weight versus by volume; air freight uses a much lighter factor of around 167 kg per cubic metre because aircraft are weight-limited, which is why the same box is priced very differently by air.

The chargeable weight is simply the greater of the two figures: actual (scale) weight and volumetric weight. Heavy, dense freight is billed on its real weight; light, bulky freight is billed on volume.

Worked example: two pallets, each 1.2 by 0.8 by 1.6 m, total volume about 3.07 m³, weighing 250 kg together. Volumetric weight is 3.07 × 333 ≈ 1,022 kg. Because 1,022 kg is far above the 250 kg scale weight, the load is billed as roughly 1,022 kg. Our chargeable-weight calculator shows which figure governs for your own load.

It is the rule that catches foam, insulation, empty packaging, furniture, textiles, plastics and a lot of e-commerce freight — anything with a low density. If your goods weigh well under 333 kg per cubic metre, expect to be priced on volume rather than the scale.

Because volume drives the price, reducing wasted space pays directly. Remove void fill and oversized boxes, flat-pack or nest where the product allows, compress soft goods, and choose carton sizes close to the product so you are not shipping air. Where the goods can take the weight on top, stackable pallets roughly halve the loading meters and the effective volume — our calculator halves the contribution for stackable lines so you can see the saving.

On partial-load (LTL) road freight, carriers look at both the loading meters a load occupies and its chargeable weight, and price on whichever is more limiting for the truck. Very light, very bulky freight is usually capped by loading meters; dense freight by weight. Both come back to the same idea: you pay for the most constraining resource your load uses on the trailer.

Run your pallets or cartons through the chargeable-weight and CBM calculators to see your volumetric weight, the governing figure and the loading meters before you request a price. Then submit the quote form for a firm written quote on your lane. Calculator figures are indicative; the binding number is the one in your written quote.