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.
What is Chargeable Weight?
In air freight, carriers charge based on whichever is higher: the actual gross weight of your shipment, or its volumetric weight — a calculated figure that represents how much space the cargo occupies in the aircraft's hold. This prevents light but bulky cargo from being transported at the same rate as dense goods.
The standard formula is: Volumetric Weight (kg) = L × W × H (cm) ÷ 6,000. Most IATA member airlines use a divisor of 6,000 (so 1 m³ = 166.67 kg chargeable weight). Express carriers — FedEx, UPS, DHL — typically use 5,000, making volumetric weight relatively heavier and more likely to apply.
Volumetric Weight (kg) = (L × W × H in cm) ÷ Factor
— Factor = 6,000 (IATA standard) or 5,000 (express)
Chargeable Weight = MAX(Gross Weight, Volumetric Weight)The IATA Standard: 6,000 vs 5,000 Divisor
The volumetric divisor determines how aggressively space is priced relative to weight. The IATA standard divisor of 6,000 means that 6,000 cubic centimetres equals 1 kg of chargeable weight, or equivalently, 1 cubic metre equals 166.67 kg. This has been the default for the majority of airline cargo carriers since IATA Resolution 600a standardised the calculation.
Express and integrator carriers (DHL Express, FedEx, UPS, TNT) typically use a divisor of 5,000, which means 1 cubic metre equals 200 kg of chargeable weight. This lower divisor makes volumetric weight higher for the same dimensions, reflecting the fact that express carriers offer door-to-door delivery with faster transit times and the space in their aircraft is at a premium. The practical effect is that express shipments are more likely to be charged on volumetric weight than on actual weight.
Some carriers use their own custom divisors. For example, certain Middle Eastern and Asian carriers may offer a divisor of 6,000 for general cargo but 5,000 for e-commerce parcels. Always confirm the applicable divisor with your carrier or freight forwarder before quoting a shipment, as the difference between 5,000 and 6,000 can change a volumetric weight calculation by 20%.
How Carriers Round Chargeable Weight
Rounding rules vary by carrier and can materially affect your invoice. Under IATA rules, chargeable weight is typically rounded up to the next 0.5 kg. So a calculated volumetric weight of 167.1 kg would be charged as 167.5 kg. Some carriers round to the next whole kilogram, making that same shipment 168 kg chargeable. Express carriers often round each piece individually before summing, while traditional airlines may round only the total. For multi-piece shipments, this distinction can mean a difference of several kilograms.
Additionally, most carriers apply a minimum chargeable weight, commonly 1 kg per piece for small parcels or a minimum per-shipment threshold. Even a small envelope may be charged as 1 kg chargeable weight. For consolidations, the total chargeable weight of the entire AWB (Air Waybill) is used, not the sum of individual pieces.
Tips for Reducing Chargeable Weight
Since chargeable weight is the higher of actual and volumetric weight, the goal is to bring both as close together as possible. Light, bulky shipments (where volumetric weight dominates) benefit from tighter packing: reduce box dimensions by eliminating excess dunnage, vacuum-pack soft goods, and avoid oversized cartons. Even removing 2 cm from each dimension of a 50-piece shipment can meaningfully reduce the total volumetric weight.
For dense shipments (where actual weight dominates), the focus shifts to weight reduction: consider lighter packaging materials, ship in bulk rather than individually boxed items, or use lighter pallet materials. Occasionally, switching from air freight to sea freight for the heaviest portion of a mixed-mode shipment is more cost-effective than optimising air freight dimensions.
When booking with express carriers (divisor 5,000), the volumetric break-even density is 200 kg per cubic metre. Any cargo denser than this will be charged on actual weight; anything lighter pays on volume. For standard airlines (divisor 6,000), the break-even is 166.67 kg per cubic metre. Knowing your cargo's density helps you predict whether optimising dimensions or weight will have a bigger impact.
Multi-Piece Shipments and Consolidations
For shipments with multiple pieces of different sizes, each piece is measured individually and its volumetric weight calculated. The total chargeable weight is then the higher of total actual weight versus total volumetric weight — not the sum of per-piece chargeable weights. This means that in a mixed shipment, a few bulky pieces can push the entire consignment onto volumetric billing even if most pieces are dense. When preparing air freight bookings, list every piece with its individual dimensions and weight so the carrier can calculate the correct chargeable weight for the whole AWB.
Consolidators and freight forwarders often aggregate multiple shippers' cargo under a single master AWB. In these cases, the chargeable weight is calculated on the total consolidated shipment, which can sometimes benefit shippers whose cargo would be volumetric on its own but becomes weight-based when combined with denser goods.
Chargeable Weight by Airline
Different airlines use different volumetric factors. Select your carrier below for a pre-configured calculator.
Calculations based on standard formulas. Always verify with your carrier for operational specifications.