Volumetric Weight Explained: How Much Do Divisors 5000, 6000 and 8000 Really Differ?
Same carton, three divisors, three different bills. See exactly how volumetric weight works and how to pick a channel that does not punish bulky goods.
The Formula
Volumetric weight (kg) = L × W × H (cm) ÷ divisor
Air freight and express bill on the greater of actual vs volumetric weight — cabin space is the scarce resource, so bulky-but-light cargo pays for space, not weight.
What the Divisor Changes
Take one 50×40×30cm carton (actual weight 5kg):
| Divisor | Volumetric weight | Billed weight | Difference vs 5000 |
|---|---|---|---|
| 5000 | 12.0kg | 12kg | — |
| 6000 | 10.0kg | 10kg | −17% |
| 8000 | 7.5kg | 7.5kg | −37% |
The bigger the divisor, the friendlier it is to bulky goods.
Which Products Care Most
- Pillows, plush toys, clothing in loose packing — volumetric weight can be 5-10x actual weight. A divisor-8000 line halves the bill versus 5000.
- Dense goods (metal parts, books, canned food) — actual weight usually exceeds volumetric, so the divisor barely matters. Prioritize unit rate instead.
- Economy postal — ignores volume entirely and bills actual weight only. The go-to for bulky, low-value, non-urgent goods.
Practical Tips
- Compress before packing: vacuum bags cut apparel volume dramatically.
- Right-size the carton: every 5cm of unused height adds billed weight on volumetric lines.
- Compare channels with the calculator — enter dimensions and it applies each line's divisor automatically.
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