How do you calculate volumetric (dimensional) weight to reduce courier shipping costs?

Couriers charge shipping rates based on whichever is greater: actual physical weight or volumetric (dimensional) weight:

### The Standard Volumetric Weight Formula:

$$\text{Volumetric Weight (kg)} = \frac{\text{Length (cm)} \times \text{Width (cm)} \times \text{Height (cm)}}{\text{DIM Divisor}}$$

### Common Courier Divisors:

• UK Domestic Express (DPD, DHL, FedEx): Usually 5,000 (or 4,000 for some express air freight).


• Royal Mail: Uses fixed dimensional tiered parcel templates (Letter, Large Letter, Small Parcel, Medium Parcel).

### Real-World Example:


• A lightweight cashmere sweater weighs only 0.4kg, but is packed into an oversized $40\times30\times15\text{cm}$ box.


• $\text{Volumetric Weight} = \frac{40 \times 30 \times 15}{5000} = \mathbf{3.6\text{kg}}$.


• The merchant pays the courier for 3.6kg instead of 0.4kg!

### Solution:
Right-sizing packaging to fit products snugly eliminates wasted shipping fees instantly.