How Chargeable Weight Works in Air Freight
Air freight and courier services often compare actual gross weight with volumetric weight. The higher number may become the chargeable weight.
Gross weight vs volumetric weight
Gross weight is the actual shipment weight including packaging. Volumetric weight estimates how much space the shipment uses compared with its weight.
Formula
Volumetric Weight = Length x Width x Height in cm x Number of Packages / Divisor.
Chargeable Weight = the greater of gross weight or volumetric weight.
Step-by-step process
- Measure the outside length, width and height of each package row in centimetres
- Multiply length x width x height x number of packages
- Divide by the divisor requested by the carrier, courier or freight forwarder
- Add volumetric weights across rows when the shipment has mixed package sizes
- Compare total volumetric weight with total actual gross weight
- Use the higher value as the chargeable weight estimate before carrier review
Example 1: dense cargo
25 cartons measure 60 cm x 40 cm x 40 cm. With an air freight divisor of 6000, volumetric weight is 400 kg.
If the actual gross weight is 450 kg, the chargeable weight estimate is 450 kg because the gross weight is greater than the volumetric weight.
Example 2: bulky light cargo
10 cartons measure 80 cm x 60 cm x 60 cm. With a divisor of 6000, volumetric weight is 480 kg.
If the actual gross weight is only 180 kg, the chargeable weight estimate is 480 kg because the shipment takes up more space than its actual weight suggests.
5000 vs 6000 divisor explanation
A divisor of 6000 is often used as an air freight planning estimate. A divisor of 5000 is often seen in courier or express calculations. A lower divisor creates a higher volumetric weight for the same carton size.
These are planning examples only. Carrier formulas, divisors, rounding methods and country rules vary, so final billing weight must be confirmed with the carrier or freight forwarder.
Rounding and remeasurement
Some providers round dimensions upward before calculating volumetric weight. Others round the final chargeable weight to the next half kilogram, full kilogram or service-specific increment.
Cargo may also be remeasured or reweighed after pickup, at the warehouse or at airline acceptance. If the carrier measurement differs from the planning measurement, the final chargeable weight can change.
What can change the final billing weight
- The carrier may reweigh or remeasure cargo after pickup or airport acceptance
- Some services round dimensions or weight upward before calculating charges
- Courier services may use a different volumetric divisor from air freight consolidations
- Oversize, dangerous goods, temperature-controlled or special-handling cargo may have separate rules
- The quote may include minimum charges even when the calculated weight is low
Practical checklist before requesting a quote
- Confirm whether the forwarder wants centimetres, inches or another measurement unit
- Use packed gross weight, including cartons, pallets and packaging
- State the divisor you used if you send your own estimate
- Tell the forwarder whether values are estimates or final warehouse measurements
- Ask whether the carrier rounds dimensions, actual weight or final chargeable weight
Limitations and professional confirmation
Chargeable weight is a billing estimate, not a booking approval. The carrier or forwarder decides the final billing method based on service rules, route, acceptance measurements and any special handling requirements.
Use ShipReady to prepare a clear estimate, then confirm the final divisor, rounding method, minimum charge and measured weight with the provider before booking.
FAQ
Why is volume used for air freight?
Aircraft space is limited, so bulky low-weight cargo may be priced by space rather than actual weight alone.
What is the difference between gross weight and volumetric weight?
Gross weight is the actual packed weight. Volumetric weight is a space-based estimate calculated from package dimensions.
Should I use 5000 or 6000?
Use the divisor requested by your carrier or forwarder. If you are only planning, 6000 is common for air freight and 5000 is common for courier estimates.
Does this apply to sea freight?
Sea freight is often quoted by CBM, container, weight or minimum charges depending on the service.
Can the final chargeable weight be different?
Yes. Carriers may remeasure, reweigh, round up or apply their own service rules before billing.