Chargeable weight is the figure a freight rate is applied to. In air freight it is the greater of two numbers: the shipment's actual (gross) weight, and its volumetric (dimensional) weight — the space the cargo occupies, converted into kilograms using a density ratio. The divisor convention most commercial airlines follow is 6,000 cubic centimetres per kilogram, which makes one cubic metre about 167 kg.
If the number on your air freight invoice is larger than the number on your warehouse scale, this rule is usually the whole reason. Nothing has been added to the rate; the rate was applied to a different quantity than the one you assumed.
That distinction matters most before the goods are packed. The quantity is fixed by how the shipment is built — how tightly it is stacked, whether it travels on pallets, how much empty space the packaging carries.
The figures in this article are illustrations for calculation. None of them is a customer case, and none of them is a quotation.
What chargeable weight means in an air freight shipment
An air freight rate is a price per kilogram, and chargeable weight is the kilogram figure that price multiplies. It replaces the question "how heavy is it" with one the carrier can charge on: how much of the aircraft's capacity does this shipment consume — in payload, in floor space, or in both at once.
An aircraft has a weight limit and a volume limit, and they run out at different points. A pallet of machine parts can exhaust the permitted payload with the hold still half empty. A pallet of assembled furniture can fill the same floor positions while weighing a fraction of that. Rating every shipment on scale weight alone would make the second kind unprofitable to carry; rating on volume alone would do the same for the first. The greater-of rule is how the industry prices both.
Air is the mode where this rule bites hardest and where it is quoted most literally. The trade-off against the alternative is set out in our guide to how sea and air freight compare on Indonesia lanes.
The three weights behind one invoice line
Three measurements are involved, and most billing questions come from conflating them.
Actual weight is what the shipment weighs on a scale, complete: goods, inner packaging, outer cartons, pallet bases, strapping and any dunnage. The trade also calls it gross weight. A packing list may also show net weight, which is the goods alone with packaging stripped out, and carriers never rate on it.
Volumetric weight — dimensional weight, volume weight or DIM weight — is not a physical measurement at all. It is derived: the cargo's outside dimensions are multiplied together, and the volume is divided by a fixed ratio to express it in kilograms. It answers "how much would this shipment weigh if it were packed to the minimum density the carrier is willing to carry".
Chargeable weight is the answer to the comparison: whichever of the two is greater. It is the only one of the three that appears as the quantity line in a rate calculation.
Both of the first two are real numbers with different jobs, and only one is meant to match your scale. If your supplier has sent a volume figure, how shipment volume is measured covers where cubic metres come from and why a finished pallet is not the sum of its cartons.
Why a cubic metre becomes about 167 kilograms
The ratio that converts volume into kilograms is a density floor. On a 6,000 divisor, any cargo packed more tightly than that density is billed on its actual weight instead.
The arithmetic is deliberately simple. One cubic metre is 1,000,000 cubic centimetres:
1,000,000 ÷ 6,000 = 166.67 kg per cubic metre
That figure — about 167 kg — is the threshold. Below it, the shipment is light for its size and volume wins. Above it, the cargo is dense enough that its own weight wins. It is the convention Maersk describes for air cargo, noting that the 6,000 divisor is an industry standard set by the International Air Transport Association, and that rates are quoted against the tariffs and rules carriers publish — the IATA air cargo tariff reference is the industry version of that document set.
Three things about the ratio are worth holding separately.
It is not one number for all transport. DHL's freight forwarding guidance works the same shipment through four modes and gets four different volumetric weights, because the ratios differ: air uses 1:6 density, rail 1:3, and less-than-container-load ocean freight 1:1, where one cubic metre counts as 1,000 kg. Road freight varies by carrier and market. The rule never changes; the ratio does.
Carriers are not obliged to use the same ratio. Some airlines apply 5,000 rather than 6,000, which produces a heavier volumetric weight from the same box. Express and courier products work on their own ratios again, and those can differ by market and by product. A published list of dimensional weight shipping factors shows the spread across postal, courier and airline practice — 5,000, 6,000 and 7,000 cubic centimetres per kilogram all appear, alongside the imperial equivalents.
The result is rounded, and usually upward. A volumetric figure landing between two kilograms is normally moved up to the next nominal band, not down. Minimum chargeable quantities and minimum billing weights can apply on top of that, so a small dense carton can still be billed above its scale weight.
How to calculate chargeable weight, step by step
Take the finished shipping units as they will actually travel — pallets included — and work outward.
- Measure each shipping unit at its maximum outside length, width and height, in centimetres, including the pallet base and any wrapping or overhang.
- Multiply the three dimensions of one unit for its volume in cubic centimetres, then multiply by the number of identical units.
- Divide the total volume by the applicable divisor — 6,000 on the convention above, or the carrier's own ratio — for volumetric weight in kilograms.
- Add up the gross weight of the same units, packaging and pallets included.
- Compare the two figures. Whichever is greater is the chargeable weight.
- Apply the applicable rounding and minimum rules, then confirm which figure the quotation is built on.
Two illustrations of the same six steps, using the 6,000 divisor:
Illustration A — light, bulky cargo | Illustration B — dense cargo | |
|---|---|---|
Shipping units | 8 pallets, each 120 × 100 × 110 cm | 6 crates, each 100 × 80 × 60 cm |
Gross weight | 180 kg per pallet (1,440 kg total) | 480 kg per crate (2,880 kg total) |
Total volume | 10.56 m³ (10,560,000 cm³) | 2.88 m³ (2,880,000 cm³) |
Volumetric weight | 1,760 kg | 480 kg |
Density | 1,440 ÷ 10.56 ≈ 136 kg per m³ | 2,880 ÷ 2.88 = 1,000 kg per m³ |
Chargeable weight | 1,760 kg — volume wins by 320 kg | 2,880 kg — actual weight wins by 2,400 kg |
Shipping units
Illustration A — light, bulky cargo
8 pallets, each 120 × 100 × 110 cm
Illustration B — dense cargo
6 crates, each 100 × 80 × 60 cm
Gross weight
Illustration A — light, bulky cargo
180 kg per pallet (1,440 kg total)
Illustration B — dense cargo
480 kg per crate (2,880 kg total)
Total volume
Illustration A — light, bulky cargo
10.56 m³ (10,560,000 cm³)
Illustration B — dense cargo
2.88 m³ (2,880,000 cm³)
Volumetric weight
Illustration A — light, bulky cargo
1,760 kg
Illustration B — dense cargo
480 kg
Density
Illustration A — light, bulky cargo
1,440 ÷ 10.56 ≈ 136 kg per m³
Illustration B — dense cargo
2,880 ÷ 2.88 = 1,000 kg per m³
Chargeable weight
Illustration A — light, bulky cargo
1,760 kg — volume wins by 320 kg
Illustration B — dense cargo
2,880 kg — actual weight wins by 2,400 kg
Illustration A sits below the 167 kg per cubic metre threshold, so space rather than mass is what the rate is applied to. Illustration B is far above it, and its volume is irrelevant to the bill. Had the divisor been 5,000, the same two volumes would have produced 2,112 kg and 576 kg — enough to change the billed quantity materially in the first example and to narrow the margin in the second.
The step people skip most often is the density check, and the comparison becomes concrete once the threshold is written down: about 167 kg per cubic metre on a 6,000 divisor, about 200 kg per cubic metre on a 5,000 divisor.
What packing and density do to the billed weight
Because chargeable weight is the greater of two figures, a packing change only helps when it moves the figure that is currently winning.
For cargo already billed on volume, the lever is the space the shipment claims. Three changes are available before the goods leave the supplier: closing the gaps between cartons so the pallet is a solid block rather than a cage; removing overhang and stray pallet feet that add centimetres to the measured footprint without adding cargo; and cutting single-use filler, which changes dimensions and gross weight at once. Each of those edits the numbers that get multiplied together, and the measurement is normally taken at the maximum outside point of the finished unit.
For cargo billed on actual weight, volume work is wasted effort. What matters there is the weight of the packaging: heavier crating, wet or absorbent padding and steel strapping all sit on the same scale as the goods. Substituting lighter protective material changes the winning figure directly.
There is a line to hold in both cases. Protection is not a cost to be minimised to the last centimetre; damaged cargo costs more than the kilogram difference it saved, and a pallet rebuilt to be shorter can end up unstackable. Where origin consolidation is part of the plan, consolidation and measurement at the origin warehouse is also the point at which the shipped dimensions are finally recorded — worth confirming there rather than assuming a re-stacking agreement held. The most expensive version of this subject is the shipment measured twice, once from the supplier's declared figures and once at the terminal, and billed on the higher.
Where chargeable weight lands in a quotation
A rate per kilogram means little on its own, because the number it multiplies is not fixed until the shipment is built and accepted. In a quotation, chargeable weight is the quantity line: rate per kilogram × chargeable kilograms, before the surcharges and handling items that attach to the lane and the season.
That is also why two quotations for the same goods can sit far apart without either being wrong. One may be built on the supplier's declared dimensions and weight; another on a measurement taken at the origin warehouse after the pallets were rebuilt. One may carry a minimum chargeable quantity the other does not. One may be an airport-to-airport figure and the other door-to-door — and on the consolidated side, what a shared-container quotation includes sets out how that scope is assembled.
The practical habit is to ask for the quantity in kilograms alongside the rate, and to ask which measurement produced it. A quotation showing both is checkable; one showing a total is not.
Ocean freight uses the same rule with different numbers
The greater-of rule is not an air freight peculiarity. It is the general way carriers reconcile weight and space, and ocean freight applies it with a much lower density floor.
On the 1:1 convention DHL describes, one cubic metre of less-than-container-load cargo counts as 1,000 kg. The threshold is therefore far higher than in air: only genuinely dense cargo — tiles, drums, batteries — is billed on its gross weight, and most consolidated cargo is billed on the volume it occupies. That is the origin of the per-cubic-metre rate structure the trade uses for LCL, and the reason a shipment can be light for air and heavy for sea at the same time.
Full-container cargo works differently again: the box itself is the billed unit, the weight side shows up as a payload limit rather than a rate multiple, and cargo that is over-length or over-weight is normally quoted separately because it cannot be handled like standard freight. On China–Indonesia lanes, what shapes a sea freight quotation follows the same inputs from the carrier side.
What to confirm before you accept a quote
Most billing disputes are answerable before the goods move, if the quotation is interrogated on these points.
What to confirm | Why it changes the number you pay |
|---|---|
The divisor applied | 6,000, 5,000 and a carrier's own ratio produce three different volumetric weights from the same box; ask which one applies, and whether it differs by product or market |
The measurement basis | dimensions declared by a supplier and dimensions measured at acceptance are not always the same figure, and the higher one is normally billed |
What "actual weight" includes | pallet bases, crating, strapping and dunnage all count; net weight does not appear in any rate calculation |
Rounding and minimums | whether the chargeable figure is rounded up to a nominal band, and whether a minimum chargeable quantity or minimum billing weight applies to this shipment |
How the quantity is shown | a quotation stating both the rate and the chargeable kilograms is checkable; one stating only a total is not |
Over-length, over-weight or unstackable cargo | normally quoted outside the standard service and confirmed separately |
The mode basis | air and LCL use different density floors, and full-container cargo is billed per container rather than per kilogram |
The divisor applied
Why it changes the number you pay
6,000, 5,000 and a carrier's own ratio produce three different volumetric weights from the same box; ask which one applies, and whether it differs by product or market
The measurement basis
Why it changes the number you pay
dimensions declared by a supplier and dimensions measured at acceptance are not always the same figure, and the higher one is normally billed
What "actual weight" includes
Why it changes the number you pay
pallet bases, crating, strapping and dunnage all count; net weight does not appear in any rate calculation
Rounding and minimums
Why it changes the number you pay
whether the chargeable figure is rounded up to a nominal band, and whether a minimum chargeable quantity or minimum billing weight applies to this shipment
How the quantity is shown
Why it changes the number you pay
a quotation stating both the rate and the chargeable kilograms is checkable; one stating only a total is not
Over-length, over-weight or unstackable cargo
Why it changes the number you pay
normally quoted outside the standard service and confirmed separately
The mode basis
Why it changes the number you pay
air and LCL use different density floors, and full-container cargo is billed per container rather than per kilogram
Where the shipment has not been built yet, the useful discipline is to state the measurement basis in the enquiry: the number of shipping units, their outside dimensions after packing, and their gross weight. Details sent that way come back as a figure that can be checked against the same arithmetic. Our China–Indonesia freight services, by mode cover the air, sea and consolidated structures those lanes run on.
Chargeable weight questions shippers ask
What is chargeable weight?
The weight the freight rate is applied to: the greater of the shipment's actual weight and its volumetric weight. It is a billing quantity rather than a physical property of the cargo, and it is a number a forwarder must be able to show you.
How do I calculate it?
Multiply the outside dimensions of each shipping unit to get volume, divide by the applicable divisor for volumetric weight, add up the gross weight of the same units, and take the larger of the two. Then apply the carrier's rounding and minimum rules to that figure.
Why divide by 6,000 for volumetric weight?
Because 6,000 cubic centimetres per kilogram is the density floor most commercial airlines work to, and dividing by it expresses volume in kilograms on that basis. One cubic metre then equals about 167 kg. Some carriers use 5,000, which sets a higher floor and a heavier volumetric weight for the same cargo — which is why the divisor is a question rather than a constant.
Is chargeable weight the same thing as gross weight?
No. Gross weight is one of the two numbers the rule compares. When cargo is dense, gross weight becomes the chargeable weight; when it is light for its size, volumetric weight does. The two match only by coincidence.
Can I reduce it?
Only by changing the figure that is currently winning. If volume is winning, tighter palletising, less overhang and less filler reduce the measured dimensions; if actual weight is winning, lighter packaging is the lever. Reducing volume on cargo already billed on weight changes nothing about the bill.
Does the same rule apply to sea freight?
Yes, with a different density floor. Less-than-container-load ocean freight commonly counts one cubic metre as 1,000 kg, so far more cargo is billed on volume than in air freight, while full-container cargo is billed per container. Our freight and shipping cost guides index the rest of this cluster, including volume measurement, container types and mode comparison.
Send the shipment details through the site and we respond within two hours on working days, with a preliminary quotation normally provided within 48 hours once the documents are complete. Shipments that involve special goods, complex clearance or project cargo are confirmed after review rather than on the standard turnaround.