Delivery vans can only carry so much, and space runs out before weight does. A light parcel that takes up a lot of room still uses space that could carry other parcels.
That's why Next Day carriers, such as DHL, charge on volumetric weight: a weight worked out from the parcel's size. Next Day prices use the same method.
Each parcel is charged on whichever is higher: its actual weight or its volumetric weight.
FAQs
Why is my parcel charged at more than it weighs?
It's light for its size, so it's charged on its volumetric weight instead.
What units should I use?
Measure the length, width and height in centimetres. The result is in kilograms.
Do I need to calculate it myself?
No. Enter each parcel's real size and weight when you book, and the price is worked out for you. It's still worth comparing the two weights before you pack, so you know which one you'll be charged on.
How can I keep it down?
Use the smallest box that fits. Oversized boxes increase volumetric weight.
Fill any empty space so you don't need a bigger box.
Combine items into fewer, smaller boxes where you can.
See Packing your Next Day parcel for more.
Does it apply to every parcel?
Yes. Every parcel is checked, and the higher of the two weights is used.