Free freight tool
Air Freight Chargeable Weight Calculator
Calculate chargeable weight line by line for multiple package sizes. Compare actual and volumetric weight, choose an air-cargo, express-courier or custom divisor, apply rounding, estimate freight and export the audit.
Total chargeable weight
0 kg
Line-by-line total: actual 0 kg; volumetric 0 kg; divisor 5000. Each line uses the higher actual or volumetric result before the selected rounding.
Carrier rules, minimums, per-piece rating and rounding differ. Select the contracted tariff basis; do not use the express divisor for general air cargo or vice versa.
Recommended next step
Audit the calculated weight against the freight invoice.
Detailed learning guide
Read the complete chargeable-weight calculation guideShort answer
How chargeable weight is calculated
Calculate volumetric weight by multiplying length × width × height in centimetres and dividing by the applicable divisor — 6,000 for general air cargo and 5,000 for most express couriers. Compare that figure with the actual gross weight and charge on whichever is higher. In imperial units the equivalents are 166 in³/lb for general air cargo and 139 in³/lb for express.
- General air cargo: L × W × H (cm) ÷ 6,000
- Express courier: L × W × H (cm) ÷ 5,000
- Chargeable weight = greater of actual and volumetric
- IATA practice rounds up to the next 0.5 kg
Actual, Volumetric and Chargeable Weight
- Compare actual and volumetric weight per cargo line
- Calculate multiple package groups
- Apply line rounding and estimate freight cost
- Export an invoice-audit CSV
Air Freight Volumetric Weight Formula
Each cargo line calculates actual weight from weight per piece × quantity and volumetric weight from dimensions, quantity and the selected divisor. The higher line result is rounded as selected, then chargeable lines are summed.
Airlines, couriers and tariffs may compare or round at different levels and may apply minimum weights. Reproduce the contracted rating rule.
Why airlines charge on volume as well as weight
An aircraft runs out of space long before it runs out of lift on most general cargo. A pallet of feather pillows and a pallet of machine parts occupy the same position in the hold, but if the airline charged only by weight it would earn a fraction as much from the pillows. Volumetric weight is the mechanism that prices the space a shipment consumes rather than the mass it contains.
The divisor encodes an assumed cargo density. A 6,000 divisor treats one cubic metre as equivalent to 167 kilograms; a 5,000 divisor treats it as 200 kilograms. Express operators use the tighter 5,000 divisor because their networks are built around small, light, high-value parcels where space is the binding constraint almost every time.
| Mode | Metric divisor | Imperial | Implied density | Typical use |
|---|---|---|---|---|
| General air cargo (IATA) | 6,000 cm³/kg | 166 in³/lb | 167 kg per CBM | Airline and forwarder air freight |
| International express | 5,000 cm³/kg | 139 in³/lb | 200 kg per CBM | DHL, FedEx, UPS and similar networks |
| European road groupage | 3,000 cm³/kg | — | 333 kg per CBM | LTL and groupage trucking |
| Ocean LCL (weight or measure) | 1,000 cm³/kg equivalent | — | 1,000 kg per CBM | Sea freight consolidations |
Divisors are contractual. Some airlines, forwarders and courier accounts apply a negotiated divisor that differs from the published one — always confirm which divisor your rate is quoted against.
The formula and a worked example
Volumetric weight in kilograms equals length × width × height in centimetres, divided by the divisor. Multiply by the number of identical pieces. Then compare the result with the actual gross weight for the same pieces and take the higher figure.
Take four cartons, each measuring 60 × 45 × 40 cm and weighing 14 kg. Each carton is 108,000 cm³. At the general air cargo divisor of 6,000 that is 18.00 kg volumetric per carton, so 72.00 kg for the four. Actual weight is 56.00 kg. Volumetric is higher, so chargeable weight is 72.00 kg. Under an express account at the 5,000 divisor the same cartons yield 21.60 kg each, or 86.40 kg — a 20% increase from the divisor alone.
| Basis | Volumetric per carton | Volumetric total | Actual total | Chargeable |
|---|---|---|---|---|
| Air cargo, 6,000 | 18.00 kg | 72.00 kg | 56.00 kg | 72.00 kg |
| Express, 5,000 | 21.60 kg | 86.40 kg | 56.00 kg | 86.40 kg |
| Road groupage, 3,000 | 36.00 kg | 144.00 kg | 56.00 kg | 144.00 kg |
Four cartons of 60 × 45 × 40 cm at 14 kg each. The cargo has not changed; only the assumed density has.
Density is the number that decides
A shipment is volumetric if its density is below the divisor's implied threshold. Below 167 kg per cubic metre it will always be charged on volume under a 6,000 divisor; above it, on actual weight. Working out the density once tells you which lever — reducing box size or reducing mass — will actually change the bill.
Rounding, and why it is not a rounding error
Air freight rounds up. Standard IATA practice takes the chargeable weight to the next half kilogram, so 72.1 kg becomes 72.5 kg and 72.6 kg becomes 73.0 kg. Some carriers and some express services round to the next whole kilogram instead. On a single shipment the difference is trivial; across a year of daily consignments it is not.
Where the rounding is applied matters as much as the increment. Rounding each piece line and then summing produces a higher figure than summing first and rounding once, because every line absorbs its own round-up. Reproduce your carrier's actual sequence rather than assuming — this calculator lets you choose, so you can match the tariff instead of arguing with it.
Rate breaks make heavier cheaper
Air cargo rates fall in bands, conventionally quoted as minimum charge, then −45 kg, +45 kg, +100 kg, +300 kg, +500 kg and +1,000 kg. Because the rate per kilogram drops at each break, a shipment just below a break can cost more in total than one just above it.
This is the origin of the 'weight break' or 'as agreed' calculation: if 96 kg at the +45 rate costs more than 100 kg at the +100 rate, the shipment is rated at 100 kg. Reputable forwarders apply the lower of the two automatically. Checking it yourself is a two-minute audit that occasionally finds real money.
Minimum charges
Every air tariff has a minimum charge, and on small shipments it is what you actually pay regardless of the chargeable weight. A 3 kg parcel and a 12 kg parcel on the same lane can cost exactly the same. Below the minimum-charge threshold, optimising dimensions changes nothing.
Per-piece, per-line or per-shipment: where the comparison happens
The single most contested point in chargeable weight is the level at which actual and volumetric are compared. Compare per shipment and a dense carton can offset a light one. Compare per piece and it cannot — each piece is charged on its own higher figure, and the total is always equal to or greater than the shipment-level result.
General air cargo conventionally compares at shipment level: total volume of the consignment against total gross weight. Many express tariffs compare per piece. Mixed consignments of dense and light cartons are where the two methods diverge most, and where invoices most often surprise the payer.
| Piece | Dimensions | Actual | Volumetric at 6,000 | Higher of the two |
|---|---|---|---|---|
| Carton A | 80 × 60 × 50 cm | 12 kg | 40.00 kg | 40.00 kg |
| Carton B | 40 × 30 × 25 cm | 48 kg | 5.00 kg | 48.00 kg |
| Per-piece total | — | 60 kg | 45.00 kg | 88.00 kg |
| Shipment-level total | — | 60 kg | 45.00 kg | 60.00 kg |
The same two cartons produce 88 kg per-piece and 60 kg at shipment level — a 47% difference from the comparison level alone, with no change to the cargo.
Ask which level your rate assumes
A rate quoted per kilogram is meaningless without knowing how the kilograms are counted. Confirm the divisor, the comparison level and the rounding rule at the quotation stage, in writing. All three are contractual, all three are negotiable, and disputes about them after the fact are rarely won.
Reducing chargeable weight legitimately
If your shipment is volumetric, every cubic centimetre you remove is money. If it is weight-controlled, shrinking the box achieves nothing. Establish which you are before redesigning anything.
- Right-size the carton: 5 cm of unnecessary headroom on a 60 × 45 cm footprint is 1,350 cm³, or 0.23 kg chargeable at the 6,000 divisor, on every single carton
- Consolidate small parcels into fewer, denser cartons where the tariff compares per piece
- Check whether a slightly larger carton crosses a rate break and lowers the total cost
- Avoid over-protective void fill that adds volume without adding protection — foam-in-place and right-sized inserts beat loose fill on both counts
- Measure the outermost point including pallet overhang, banding and protruding handles, because that is what the carrier measures
- Where cargo is genuinely dense, ask whether the tariff offers a low-density or high-density rating basis
- Compare a sea-air or road-air routing for low-density cargo, where the divisor penalty is largest
Checking an air freight invoice
- 1Take dimensions and gross weight from the air waybill and the packing list, not from the booking request — the carrier rates on what it measured at acceptance.
- 2Recalculate volumetric weight at the divisor your contract specifies, and confirm the invoice used the same one.
- 3Confirm the comparison level: per piece or per shipment, matching the tariff.
- 4Apply the rounding rule in the same sequence the carrier applies it, then compare against the chargeable weight printed on the AWB.
- 5Check the rate band used against the published breaks, and test whether the next break up would have produced a lower total.
- 6Confirm the minimum charge was not applied above a properly rated weight.
- 7Reconcile surcharges — fuel, security, screening, dangerous goods, terminal handling — as separate lines rather than accepting a bundled total.
- 8Export the calculation audit and file it with the AWB so any dispute is evidenced.
Chargeable Weight Calculator FAQ
Practical answers to the questions operators, forwarders and shippers ask most often about chargeable weight calculator results.
What is the chargeable weight formula for air freight?
Volumetric weight in kilograms = (length × width × height in centimetres) ÷ 6,000 for general air cargo, or ÷ 5,000 for most express services. Multiply by the number of pieces, compare the result with the actual gross weight, and the chargeable weight is whichever is greater — then rounded up, conventionally to the next half kilogram.
What is the difference between the 5,000 and 6,000 divisor?
They encode different assumed cargo densities. The 6,000 divisor used for general air cargo treats one cubic metre as 167 kg; the 5,000 divisor used by most international express carriers treats it as 200 kg. The same shipment costs 20% more in chargeable weight under 5,000. Which applies is a matter of contract, not cargo type, so confirm it on your rate sheet.
How do I calculate volumetric weight in inches and pounds?
Divide cubic inches by 166 for general air cargo or by 139 for express, giving the volumetric weight in pounds. These are the imperial equivalents of the 6,000 and 5,000 metric divisors, so they produce the same answer once converted. Keep all three dimensions in the same unit before dividing.
Is chargeable weight the same as gross weight?
Only when the cargo is dense enough that actual weight exceeds volumetric weight. Gross weight is what the shipment physically weighs including packaging. Chargeable weight is the billing figure — the greater of gross and volumetric. Both appear on the air waybill, in separate boxes, and a document where they are identical for low-density cargo is worth a second look.
Should I compare actual and volumetric per piece or for the whole shipment?
It depends on the tariff. General air cargo conventionally compares at shipment level, taking total volume against total gross weight. Many express tariffs compare per piece, which produces a higher total whenever a consignment mixes dense and light cartons. The difference on a mixed shipment can exceed 40%, so confirm the level before you accept a quotation.
How is chargeable weight rounded?
Standard IATA practice rounds up to the next 0.5 kg; some carriers and express services round to the next whole kilogram. The sequence matters too: rounding each line before summing gives a higher figure than summing then rounding once. Reproduce your carrier's actual method rather than assuming the industry default.
What are air freight rate breaks?
Rate bands where the per-kilogram rate steps down as weight increases, conventionally at minimum, −45, +45, +100, +300, +500 and +1,000 kg. Because the rate falls at each break, a shipment just below one can cost more in total than a heavier shipment just above it. Where that happens the shipment should be rated at the higher break — check it, because it is not always applied.
Does volumetric weight apply to ocean freight?
Not in this form. Ocean LCL uses a weight-or-measure basis where one cubic metre is treated as one metric ton — effectively a 1,000 kg per CBM density against air freight's 167 or 200. Applying an air divisor to an ocean shipment, or the reverse, produces answers that are wrong by a factor of five or more.
How can I reduce chargeable weight?
Only if your cargo is volume-controlled. Right-size cartons to eliminate headroom, consolidate where the tariff compares per piece, replace bulky void fill with right-sized protection, and check whether crossing a rate break lowers the total. If the cargo is weight-controlled — density above roughly 167 kg per CBM at a 6,000 divisor — none of that changes the bill, and the lever is the rate itself.
Do carriers measure my cartons themselves?
Yes, routinely, at the point of acceptance. Dimensional scanners at handling facilities measure to the outermost point of the piece as presented, including pallet overhang, banding, protruding handles and any bulge in the carton. Cargo is rated on the measured figure, not the declared one, which is why declared dimensions should be taken from the packed article rather than the flat carton specification.
What is a minimum charge and when does it apply?
The floor price for a shipment on a given lane, applied when the rated weight produces a total below it. Below the threshold, chargeable weight has no effect on price — a 3 kg and a 12 kg parcel may cost the same. It is worth knowing your minimum-charge weight per lane, because consolidating shipments that each fall below it is often free capacity.
Can GainingDocx check the chargeable weight on my air waybills?
Yes. Extracting an air waybill captures pieces, gross weight, chargeable weight, rate class and charge lines as separate structured fields, so the printed chargeable weight can be reconciled against the packing list dimensions and against the freight invoice rather than taken on trust.
Related tools, templates and guides
- Chargeable weight: the complete calculation guideDivisors, rate breaks, rounding and worked examples in long form.
- Air waybill parserExtract pieces, gross weight, chargeable weight and charge lines from a MAWB or HAWB.
- CBM calculatorGet the cubic-metre total that feeds every volumetric calculation.
- Air freight invoice auditReconcile rated weights and surcharges across the AWB, invoice and booking.