GET /api/chargeable-weight?l=120&w=80&h=100&gw=500What Is Chargeable Weight?
Chargeable weight is the figure airlines use to price your air freight shipment. It is always the greater of two values: the actual gross weight (what the shipment weighs on a scale) or the volumetric weight (a calculated figure based on the shipment's dimensions). This principle — known in the industry as “weight or measure” — ensures carriers are compensated fairly for both the mass and the space a shipment occupies in the aircraft.
A heavy, compact shipment (like machine parts) will typically be charged on actual weight. A light, bulky shipment (like clothing or plastic goods) will be charged on volumetric weight — often significantly more than the actual weight.
The Volumetric Weight Formula
The divisor of 6,000 is the IATA standard used by most international air freight carriers. It assumes a density ratio where 1 cubic metre of cargo should weigh at least approximately 167 kg.
Divisor Variations by Carrier Type
| Carrier Type | Typical Divisor | Effect |
|---|---|---|
| International air freight (IATA standard) | 6,000 | Standard — used by most airlines |
| Express couriers (DHL, FedEx, UPS) | 5,000 | Results in higher volumetric weight |
| Some regional/budget carriers | 4,000 | Results in even higher volumetric weight |
| Sea freight (LCL) | Different model | Uses 1 CBM = 1,000 kg (W/M rule) |
Always confirm the divisor with your carrier before quoting. A shipment quoted at divisor 6,000 will have a different chargeable weight than the same shipment at 5,000. The difference can be significant on bulky cargo.
Worked Examples
A shipment of automotive parts: 5 boxes, each 50 × 40 × 40 cm, weighing 30 kg each.
Volumetric weight: (50 × 40 × 40) × 5 ÷ 6,000 = 67 kg
Chargeable weight: 150 kg (actual wins)
A shipment of textile goods: 3 boxes, each 80 × 60 × 60 cm, weighing 10 kg each.
Volumetric weight: (80 × 60 × 60) × 3 ÷ 6,000 = 144 kg
Chargeable weight: 144 kg (volumetric wins — nearly 5× the actual weight)
How to Reduce Chargeable Weight
- Use right-sized packaging — every centimetre of empty space increases volumetric weight at your expense
- Avoid oversized boxes for small items
- Consider flat-packing or vacuum compression for textiles and soft goods
- For multi-piece shipments, measure each piece separately — the sum of individual volumetric weights may be less than measuring the shipment as one block
- Compare carriers: a carrier using divisor 6,000 will be cheaper for bulky goods than one using 5,000
Frequently Asked Questions
What divisor do most airlines use?
Can I negotiate the volumetric divisor?
What is the “pivot weight” or density break-even?
How does chargeable weight differ for sea freight?
Does chargeable weight include pallet weight?
Formulas and divisors based on IATA Cargo Tariff standards. Carrier-specific divisors may vary — always confirm with your carrier.
How IAG Cargo Calculates Chargeable Weight
IAG Cargo (BA/IB) uses a volumetric factor of 6,000 to calculate dimensional weight. The formula is:
Volumetric Weight (kg) = (L × W × H in cm) ÷ 6,000
Chargeable Weight = MAX(Actual Gross Weight, Volumetric Weight)IAG Cargo follows the IATA standard volumetric factor of 6,000, meaning 1 cubic metre (1,000,000 cm³) of cargo is treated as 166.67 kg of chargeable weight. If your shipment weighs less than this, you will be charged on volume.
Always verify the exact rate basis with IAG Cargo or your freight forwarder before booking, as surcharges, fuel levies, and lane-specific tariffs may apply on top of the base chargeable weight rate.