Parcel planning
How dimensional weight affects parcel shipping costs
Use a worked example to compare scale weight, dimensional weight and the effect of packing choices.
Sources reviewed
A large box can cost more to ship even if it is light. DHL Express compares the weight on the scale with the weight calculated from the box size and uses the higher figure. For the DHL example, multiply the outside length, width and height in centimeters and divide by 5,000 to get kilograms. Check the divisor and rounding for your own route. DHL dimensional weight guide
Work through two box sizes
Suppose two parcels both weigh 2.4 kg on the scale. Using the DHL example divisor, a 40 × 30 × 25 cm box has a dimensional weight of 6 kg, and a 35 × 25 × 20 cm box has a dimensional weight of 3.5 kg. In this example, dimensional weight is higher than actual weight for both boxes. Comparing box sizes before choosing a route can make a difference of 2.5 kg in billable weight.
Compare the packed parcel
- Ask whether the dimensions in your quote describe the finished outer carton or an estimate before packing.
- If the service offers a packing rehearsal, request the final dimensions, scale weight and packing options in the same message. Say which retail boxes or protective materials matter to you.
- Recheck the revised parcel on the same route first. Compare final charges and size limits, then see whether a second route offers a better fit. iTaoBuy freight estimator
If a different box would change what can travel together, use the guide to comparing separate and combined parcels.