Volumetric Weight Calculator

Enter your parcel details

Length (cm)

Width (cm)

Height (cm)

Actual weight (kg)

Number of parcels

Calculated using the standard UK road courier divisor of 5000 (L × W × H in cm ÷ 5000 = volumetric kg). Air freight and some international services may use a different divisor — check with your carrier for cross-border shipments.

Why it matters

Why couriers charge volumetric weight

A large, light parcel — like a lampshade or a box of soft toys — takes up just as much space in a van as a smaller, heavier one. Couriers charge based on whichever is greater: the actual weight on the scales, or the volumetric weight worked out from the parcel's dimensions. That's called the billable weight, and it's what actually appears on your invoice.

If you're shipping bulky, lightweight products regularly, understanding volumetric weight helps you price your own shipping correctly and avoid surprise invoice adjustments from your carrier.

How volumetric weight is calculated

Volumetric weight (also called dimensional weight) is a way for couriers to charge for the space a parcel takes up, not only how heavy it is. The calculation is simple: multiply the length, width and height of the parcel in centimetres, then divide by a set number. Many UK carriers use 5,000 for standard parcel services, which gives you the volumetric weight in kilograms.

For example, a box measuring 50 cm × 40 cm × 30 cm has a volume of 60,000 cm³. Divided by 5,000, its volumetric weight is 12 kg. If the box only weighs 3 kg on the scales, you will usually be charged for 12 kg, because that is the greater of the two figures.

Actual weight versus chargeable weight

Couriers charge on the chargeable weight, which is whichever is higher: the actual weight or the volumetric weight. Dense items such as books, tools or liquids tend to be charged on actual weight. Light but bulky items such as clothing, pillows or empty packaging tend to be charged on volumetric weight.

Why the divisor can differ

Not every service uses the same divisor. Some carriers and services use different values, and international and pallet services can follow separate rules. That is why we confirm the chargeable weight for your specific service when we quote, rather than relying on a single formula for everything.

How to reduce your volumetric weight and shipping costs

Use boxes that fit the product closely instead of oversized cartons.
Switch to polybags or padded mailers for soft goods that do not need a rigid box.
Remove unnecessary void fill and packaging.
Consider whether a product could be packed flat or in a smaller configuration.
Review your most-shipped products first, since small savings multiply across many orders.

Fulfilment packaging that saves money

If you use a 3PL, packaging choices matter. A fulfilment partner can recommend carton sizes, test different pack formats and keep a range of box sizes in stock so each order ships in the smallest suitable package. Over hundreds or thousands of orders, that can noticeably reduce your delivery costs.

FAQs

Common questions

What is the volumetric weight formula?

Multiply length × width × height in centimetres, then divide by 5,000 for many standard UK parcel services. The result is the volumetric weight in kilograms.

Which weight will I be charged for?

The chargeable weight is the higher of the actual weight and the volumetric weight for your service.

What is volumetric weight?

Volumetric (or dimensional) weight is a pricing method couriers use for large, lightweight parcels. It's calculated from a parcel's length, width and height rather than its actual weight, because bulky items take up van and lorry space regardless of how light they are.

How do I calculate volumetric weight?

Multiply length × width × height in centimetres, then divide by 5000 (the standard UK road courier divisor) to get the volumetric weight in kilograms. Couriers charge based on whichever is higher: the actual weight or the volumetric weight.

Why was I charged more than my parcel's actual weight?

If your parcel is large but light, its volumetric weight can be higher than its actual weight. Couriers charge for whichever figure is greater, known as the billable weight, since a bulky parcel still takes up the same space in a van as a heavier, denser one.

Does this apply to same-day courier and pallet deliveries too?

Yes — volumetric weight principles apply across same-day courier, overnight parcels and pallet distribution, though pallet networks typically use their own space-based pricing bands. Call 0116 444 0444 if you're unsure how your consignment will be charged.