Tools · Volumetric Weight Calculator
Volumetric weight calculator — find the weight you will actually be billed for.
Air and express carriers charge the greater of actual gross weight and volumetric weight. Enter carton dimensions and the real weight to see which figure applies and how far apart they are — this is the most common reason a freight quote moves after the cargo has been collected.
Billed on volumetric weight · divisor 6000
| Volumetric weight | 56.00 kg |
| Actual gross weight | 48.00 kg |
| Per carton, volumetric | 14.00 kg |
| Total volume | 0.336 m³ |
How it works
Light, bulky cargo pays for the space it occupies.
A carton of cushions and a carton of bearings can read the same on the scale and cost very different amounts to fly. Carriers protect against that by converting volume into a notional weight, then billing whichever number is higher.
Freight planning guide
How volumetric weight becomes chargeable weight
Airlines and express carriers have limited space as well as weight capacity. Volumetric weight converts the space occupied by a package into a comparable kilogram figure, allowing dense and bulky cargo to be rated consistently.
Calculate each package from its packed size
Measure the outside length, width, and height of the finished package in centimetres. Multiply those three dimensions, divide by the divisor in the applicable rate, and multiply by the number of identical cartons. With a divisor of 6,000, a 60 × 40 × 35 cm carton has a volumetric weight of 14 kg. Four identical cartons therefore produce 56 volumetric kg.
Next compare the total volumetric weight with the shipment's total actual gross weight. The greater number is the chargeable weight used as the starting point for the freight rate. If those four cartons weigh 48 kg on the scale, the example would normally be rated on 56 kg before carrier rounding, minimum charges, and other tariff rules are applied.
The divisor must match the service and contract
This calculator provides common planning defaults: 6,000 cm³/kg for air freight and 5,000 cm³/kg for international express. A carrier, lane, product, or negotiated account may use a different divisor or rounding method. The written quotation or service agreement controls, so confirm the divisor before relying on the result for landed-cost decisions.
Packaging changes can directly change chargeable weight. Removing empty space, selecting a better-fitting carton, disassembling a product, or packing more units safely into one outer carton can lower volumetric weight. The goal is not to compress cargo until it becomes vulnerable; it is to remove avoidable volume while preserving protection and carrier acceptance.
For mixed-size shipments, calculate every carton group separately. Carriers may measure individual pieces with automated equipment and round each package before adding the shipment total. Share a packing list with piece-level dimensions and weights so the forwarder can reproduce the carrier's method rather than relying on one average carton.
Inputs that make an air or express quote reliable
- Provide the packed dimensions, gross weight, and quantity for every package type.
- Say whether dimensions are final or supplied before export packing and palletisation.
- Confirm the service—airport-to-airport, door-to-airport, or door-to-door—and the required delivery date.
- Identify batteries, liquids, magnets, chemicals, or other cargo that may change carrier acceptance.
Plan your shipment
Turn the result into a shipping plan.
For an urgent shipment, calculate chargeable weight before comparing air freight and express courier options. Carrier acceptance and the receiving deadline determine the workable service.
For a less urgent shipment, use the CBM calculator to prepare a sea freight comparison. Include the destination and cargo-ready date when requesting rates.
Prepare the remaining inputs with the shipping guide, compare freight solutions, and bring the result to the China freight forwarding team. For more detailed explanations, browse the logistics articles.
What is the difference between volumetric and chargeable weight?
Volumetric weight is the package volume converted into kilograms using a divisor. Chargeable weight is the figure used to begin rating the shipment, usually the greater of total actual gross weight and total volumetric weight. Carrier rounding, minimums, and tariff rules can still affect the final billed weight.
Should I use a 5,000 or 6,000 divisor?
Use the divisor written into the carrier or forwarder quotation. A 6,000 cm³/kg divisor is a common air-freight planning basis, while 5,000 cm³/kg is common for international express. These are defaults, not guarantees. Account agreements, lanes, services, and carriers can apply a different conversion or rounding method.
Can repacking reduce air-freight cost?
It can when the shipment is billed on volumetric weight and the new packaging safely removes unused space. Compare the revised dimensions, material and labour cost, product protection, and carrier requirements before changing the pack. Repacking will not reduce the chargeable figure when actual gross weight remains higher than volumetric weight.
Why is the carrier's measured weight different from my calculation?
Differences can come from final packaging, pallet dimensions, protrusions, scale accuracy, automated dimensioning, per-piece rounding, or a divisor that differs from the planning default. Ask for the carrier's recorded dimensions, gross weight, divisor, and rounding rule, then compare them with the packing list used for the original quotation.
Turn this chargeable weight into a quote.
Send the dimensions and weight above with your origin, destination, and required date. One agent replies with compared air and express options within 24 hours.