Volumetric weight: definition, calculation and formula to cut your shipping bill

Volumetric weight expresses an item's volume as a theoretical weight in kilograms.

This formula is commonly used in freight transport to include, alongside weight, the volume of parcels as a billable element.

Carriers have limited space when moving goods by truck, train, ship or plane.

To stay profitable, and to prevent customers from abusing the system with oversized parcels, carriers apply volumetric weight.

A parcel's actual weight is how much the parcel really weighs.

Volumetric weight is a theoretical weight representing what the parcel's volume would weigh.

The carrier always keeps the heavier weight: so if the volumetric weight is greater than the actual weight, the volumetric weight is used.

Careful, this rule is not universal!

Many carriers apply a tolerance in kilograms to the volumetric weight.

DPD, for instance, applies a 7-kilogram tolerance to volumetric weight. This means the volumetric weight must exceed the actual weight by more than 7 kilograms.

If I have a parcel weighing 10 kg and the volumetric weight is 12 kg → 12 − 10 = 2 < 7: the actual weight is used.

If I have a volumetric weight of 18 kg → 18 − 10 = 8 > 7, then the volumetric weight is used.

We need the parcel dimensions: length (cm), width (cm) and height (cm), as well as the volumetric divisor used by the carrier.

Volumetric weight is calculated using the following formula:

Volumetric weight (kg) = length (cm) × width (cm) × height (cm) ÷ volumetric divisor

The conversion factor reflects how much volume matters for a shipment.

The less space a carrier has to move goods, the smaller the divisor (higher volumetric weight).

Conversely, the more space a carrier has, the larger the divisor (lower volumetric weight).

The conversion factor is provided in your transport contract; you can also ask your carriers to send you the information.

* Example for 2 parcels of 120 × 80 × 50 cm: (L × W × H ⁄ divisor) × number of parcels. For sea freight, this formula applies to groupage (LCL); for full container loads (FCL), per-container charges replace volume-based charges.

Carrier	Volumetric divisor	Tolerance
Chronopost	5,000	7 kg
Colissimo	5,000	—
DHL	5,000	—
DPD	5,000	7 kg
FedEx	4,000 – 5,000	—
DB Schenker	—	—
Géodis	—	—
GLS	—	—
Heppner	—	—
Mondial Relay	—	—

"—": the carrier bills by actual weight. FedEx applies a 4,000 or 5,000 divisor depending on the offer.

Most carriers now apply volumetric weight to their shipments. This metric started to spread around 2020, during the onset of COVID-19 and the surge in shipments driven by the growth of e-commerce.

Many domestic offers are not yet affected by volumetric weight, compared with international offers.

As a carrier's customer, volumetric weight gives you no advantage…

However, it is beneficial for the planet:

• By accounting for volumetric weight, we avoid the excesses of over-packaging and therefore the overconsumption of cardboard.
• We also avoid requiring more transport or round trips that emit CO2 into the atmosphere.

Just goes to show: something painful on an invoice can deliver positive externalities for the planet.

In 2026, 1 in 5 shipped parcels is billed by volumetric weight, leading to overbilling of 30 to 50% of the shipping price.

Failing to account for volumetric weight means eating into a margin hard-won throughout the sales process and the logistics chain.

First, define the scope of the problem: at month-end, audit your transport invoices to identify which order and shipment types are charged volumetric weight. Invoices sometimes lack the information needed to justify volumetric weight; you are entitled to ask your carrier for this data, which is essential to justify the invoice.

Here are several ways to reduce the volumetric weight of your shipments:

• Diversify your packaging formats.
• Set a minimum weight per packaging format.
• Favor carriers that do not apply volumetric weight for your bulky shipments.
• Negotiate a tolerance or the divisor on your volumetric weight.