Chargeable Weight Calculator: Air, Courier, Road, Sea

Formula, assumptions, and limits

To calculate chargeable weight, divide the total package volume in cubic centimeters by the carrier’s divisor to get the volumetric weight, then take the greater of that figure and the actual scale weight:

$$W_{\text{vol}} = \frac{L \cdot W \cdot H \cdot n}{D} \qquad W_{\text{chg}} = \max\left(W_{\text{actual}},; W_{\text{vol}}\right)$$

L, W, H - package dimensions in centimeters (the calculator converts from m, mm, or inches). n - number of identical packages. D - the divisor in cm³/kg from the carrier’s tariff. W_actual - total gross weight on the scale, packaging included.

The divisor is the entire game. IATA’s TACT rules set 6,000 cm³/kg for international air cargo, equivalent to 167 kg per cubic meter. DHL, FedEx, and UPS bill international express at 5,000 cm³/kg (200 kg/m³) after their mid-2010s shift from 6,000. US domestic airfreight commonly works at 7,000 cm³/kg (194 in³/lb, about 143 kg/m³), and that factor coexists with the IATA standard rather than having been replaced by it. European road groupage uses roughly 3,000 cm³/kg (333 kg/m³). Sea LCL uses no divisor at all: it bills per revenue ton on the weight-or-measurement rule, 1 m³ or 1,000 kg, whichever is greater.

The break-even density follows directly: cargo denser than the divisor’s kg-per-m³ equivalent pays on actual weight, lighter cargo pays on volume. At 6,000 the threshold is 167 kg/m³; at 5,000 it rises to 200 kg/m³, which is why the courier shift pushed so many borderline shipments from actual into volumetric billing.

Assumptions and limits: the calculator treats all packages as identical rectangles measured at their outermost points; irregular shapes are measured by carriers at the smallest enclosing box. Divisors are tariff terms, not law, and a carrier can apply a different factor by service or contract; the custom-divisor option covers those cases, and the quoted rate sheet always governs. Minimum chargeable weights (couriers commonly bill at least 0.5 kg steps and round up) are not modeled.

Carrier divisor reference

Check the rate sheet before quoting: the divisor is printed on courier tariffs and forwarder quotations, and contract shippers sometimes hold a negotiated 6,000 with a courier that publishes 5,000. US domestic parcel services state the same concept in inches and pounds and revise their parcel dim divisors by tariff year; for those, take the in³/lb figure from the carrier’s current service guide and enter it through the custom divisor after converting (in³/lb × 36.13 = cm³/kg).

How to use this calculator

1. Measure one package’s length, width, and height at the longest points, packaging included.
2. Select the service, which sets the divisor: IATA air, express courier, US domestic air, road groupage, sea LCL, or a custom divisor from your carrier’s tariff.
3. Enter the package count and the total actual gross weight from the scale.
4. Read the volumetric weight, the chargeable weight, and which basis governs.
5. Enter your quoted rate per kilogram (per revenue ton for sea LCL) to price the shipment.

Two worked scenarios

Volumetric governs. 40 cartons of pillows, 50 × 50 × 50 cm, 4 kg each. Volume per carton is 125,000 cm³; total 5,000,000 cm³. At the courier 5,000 divisor the volumetric weight is 1,000 kg against 160 kg actual, so the courier bills 1,000 kg: over six times the scale weight. The same cargo booked as IATA air cargo at 6,000 comes to 833 kg chargeable, and as sea LCL it is 5 m³ = 5 revenue tons.

Actual governs. A 120 × 80 × 60 cm crate of valve castings, one piece, 460 kg. Volume is 576,000 cm³, so air volumetric at 6,000 is 96 kg: the 460 kg actual weight governs on every mode, and on sea LCL the weight side of W/M (0.46 t) still loses to the 0.576 m³ measurement side, making it a 0.576 RT shipment. Density decides everything: the pillows sit at 32 kg/m³, the castings at 799 kg/m³.

Common errors

1. Quoting at 6,000 for a courier shipment. The courier bills at 5,000; the volumetric weight on the invoice comes back 20% above the quote.
2. Using inner carton dimensions. Carriers measure the outermost envelope, including bulges, strapping, and pallet overhang. Two centimeters added to each dimension of a 50 cm cube adds about 12% to the volume; a 2 cm bulge on every face adds 26%.
3. Weighing without packaging. Actual weight is gross, not net. Pallet, crate, and dunnage weight count.
4. Rounding down. Carriers round dimensions and chargeable weight up, commonly to the next 0.5 kg; a hand calculation that rounds down understates the bill.

When to use this calculator

Use this tool when you hold a rate per kilogram and need the billed weight and cost for a specific shipment. If you are still choosing a mode, or need total volume and container fit for a multi-carton consignment, start with the CBM calculator, which compares all modes side by side; this page goes deeper on a single mode with carrier-specific divisors and the freight charge. For full-container decisions, the FCL vs LCL break-even calculator takes over where per-kilogram pricing stops making sense.

About This Chargeable Weight Calculator

Chargeable weight is the greater of actual and volumetric weight, and it is the figure every air, courier, and road freight invoice is built on. This calculator is for shippers, forwarders, and e-commerce operations that need the billed weight before the carrier’s invoice arrives. It takes package dimensions in any common unit, the package count, the actual scale weight, and the service’s divisor, and returns the volumetric weight, the chargeable weight with its governing basis, and the freight charge at your quoted rate.

The divisors follow the published conventions: IATA TACT 6,000 cm³/kg for international air cargo, the 5,000 figure DHL, FedEx, and UPS apply to international express, 7,000 for US domestic airfreight, and the European road-groupage convention near 3,000. Sea LCL is handled on the weight-or-measurement revenue-ton rule rather than a divisor. A custom divisor field covers negotiated contracts and the odd national carrier that publishes its own factor.

The chart shows actual weight against volumetric weight for the selected divisor, so the governing side and the margin between them are visible before the rate is even applied. Density does the deciding, and the chart makes the density verdict obvious at a glance.

Further reading

• Chargeable weight
• CBM (cubic meter) in freight
• CBM calculator
• FCL vs LCL break-even calculator

Frequently asked questions

What is chargeable weight?

Chargeable weight is the figure a carrier bills: the greater of the shipment's actual gross weight and its volumetric weight. Volumetric weight converts package volume to a weight equivalent through the carrier's divisor, so light, bulky cargo pays for the space it occupies.

How is volumetric weight calculated?

Multiply length, width, and height in centimeters to get the volume per package, multiply by the package count, then divide by the carrier's divisor: 6,000 cm3 per kg for IATA international air, 5,000 for most express couriers, 7,000 for US domestic air, about 3,000 for European road groupage.

Why do couriers use 5,000 instead of 6,000?

DHL, FedEx, and UPS moved their international express divisor from 6,000 to 5,000 cm3 per kg in the mid-2010s, which raised volumetric weight on identical cargo by 20%. The IATA 6,000 standard still applies to general air cargo booked through airlines and forwarders.

Is dimensional weight the same as volumetric weight?

Yes. Dimensional weight, volumetric weight, and dim weight name the same concept: package volume converted to a billing weight through the carrier's divisor. US parcel networks state it in inches and pounds, air cargo in centimeters and kilograms, but the max-of-actual-and-volumetric rule is identical.

What chargeable weight applies to sea freight?

Sea LCL does not use a divisor. It bills per revenue ton on the weight-or-measurement (W/M) basis: 1 cubic meter or 1,000 kg, whichever produces the larger figure, which is equivalent to a 1,000 kg-per-cubic-meter break-even density.