Couriers bill the greater of actual weight and dimensional weight, so oversized boxes cost more.
How to use the Dimensional Weight Calculator
- Length
- Width
- Height
- Actual weight
- Carrier divisor
Results update as you type, and every field accepts the units shown in its menu.
How it works
Multiply the box dimensions and divide by the carrier’s divisor.
Inputs explained
| Field | What to enter |
|---|---|
| Length | In cm |
| Width | In cm |
| Height | In cm |
| Actual weight | Units: kg, lb, g, oz, st |
| Carrier divisor | Choose one: 5000 (most express couriers), 6000 (some postal/economy), 4000 |
What each result means
- Dimensional weight = [Length]×[Width]×[Height]÷[Carrier divisor]
- Billable weight = max([Dimensional weight], [Actual weight])
Example values
How the main result changes when Length changes and everything else stays at the example values above:
| Length (cm) | Billable weight (kg) |
|---|---|
| 25 | 6 |
| 37.5 | 9 |
| 50 | 12 |
| 62.5 | 15 |
| 75 | 18 |
| 100 | 24 |
Formula
DIM weight (kg) = L × W × H (cm) ÷ divisor (often 5000)DIM weight (lb) = L × W × H (in) ÷ 139Worked example
Inputs — Length: 50 cm; Width: 40 cm; Height: 30 cm; Actual weight: 6 kg; Carrier divisor: 5000 (most express couriers).
Results — Dimensional weight = 12 kg; Billable weight = 12 kg.
Frequently asked questions
How can I reduce dimensional weight?
Use the smallest box that protects the item.
Do carriers round up?
Usually dimensions to the next whole cm or inch and weight to the next 0.5 kg or lb.
What formula does the Dimensional Weight Calculator use?
DIM weight (kg) = L × W × H (cm) ÷ divisor (often 5000).