Understanding volumetric weight and how it affects your shipping price
What volumetric weight is, how couriers calculate it and how smarter packaging keeps your shipping costs down.
Volumetric weight, sometimes called dimensional weight, is one of the most misunderstood parts of parcel pricing. It explains why a box of pillows can cost more to send than a box of books. Once you understand it, you can pack smarter and keep your shipping price low.
Getting volumetric weight right is one of the quickest ways to control shipping costs, because it puts you back in charge of the single biggest variable on bulky parcels. The principles below apply whether you ship with Royal Mail, DHL, DPD, UPS or FedEx.
What volumetric weight means
Couriers have limited space in vans and aircraft, so they charge on whichever is greater: the actual weight of your parcel or its volumetric weight. Volumetric weight is worked out from the length, width and height of the parcel, then divided by a standard figure set by each carrier.
How to calculate it
Multiply length by width by height in centimetres, then divide by the carrier divisor, which is often 5000 for international air services. The result is the volumetric weight in kilograms. If that is higher than the real weight, the price is based on it.
How to keep it down
- Use a box that fits the contents with minimal empty space.
- Avoid oversized packaging for small items.
- Fill gaps with light protective material rather than upsizing the box.
- Enter accurate dimensions when you quote so there are no surprises at collection.
Frequently asked questions
What divisor do carriers use for volumetric weight?
Many international air services divide by 5000, while some road services use 4000. The exact divisor varies by carrier and service, which is why comparing live quotes on your real dimensions matters more than memorising a formula.
Why is my light parcel so expensive to send?
Because it is bulky. When volumetric weight is higher than actual weight, the price is based on the space the parcel takes up. Repacking into a smaller box is the quickest fix.
A quick habit that saves money is to measure the parcel after packing, not before, then quote on those real dimensions. Pigee uses the figures you enter, so accurate measuring at this stage is what keeps the booked price honest.