The rule for calculating chargeable weight in air freight is simple: compare actual gross weight with volumetric weight, then charge the higher figure. A shipment that weighs 100 kg but fills the space of 160 kg is rated at 160 kg. Junior pricing and operations staff need to know which weight controls before the airline measures the cargo.
How to calculate chargeable weight in air freight
Chargeable weight is always the higher of actual gross weight and volumetric weight, both stated in kilograms.
Use this sequence:
- Get the actual gross weight from the scale. Include product, packaging, pallets, straps and dunnage.
- Measure each piece in centimetres, using the outside edges. Length, width, height.
- Calculate the cubic volume of each piece. Sum the volumes of all pieces in the consignment.
- Divide the total cubic centimetres by 6,000. This gives the volumetric weight in kilograms.
- Compare gross weight with volumetric weight. The higher figure is the chargeable weight.
The chargeable weight is the figure the airline rates. It is the weight used for the air waybill rating.
Air freight chargeable weight formula
Volumetric weight is the calculated part. For dimensions in centimetres:
Volumetric weight (kg) = (Length cm × Width cm × Height cm) ÷ 6,000
For multiple pieces, sum the total volume first, then divide once. This is more accurate than rounding every package separately.
If the dimensions are in metres:
Volumetric weight (kg) = cubic metres × 1,000,000 ÷ 6,000
That is the same as cubic metres × 166.67 kg.
Many air freight quotes in the Gulf use the 6,000 divisor. Some carriers or express products use 5,000. The rate card states the divisor. The lower the divisor, the higher the volumetric weight for the same dimensions.
What is volumetric weight in air freight
Volumetric weight, also called dimensional weight, estimates the weight of the space a shipment occupies. Aircraft have both a weight limit and a volume limit.
Dense cargo reaches the weight limit before the hold is full. Light, bulky cargo fills the hold before the weight limit is reached. Airlines use volumetric weight to charge for the space the cargo consumes.
On Gulf lanes, this often affects garments, packaging, foam, plastic articles and machinery with a large protective crate but modest weight. Ignoring dimensions on those goods under-quotes the shipment.
Actual gross weight: what to include
Gross weight in chargeable weight terms is the weight the airline sees at acceptance. It includes the product, the packaging, the pallet, straps and dunnage.
To avoid under-quoting:
- Weigh the packed shipment, not the product alone.
- Add the pallet weight if the pallet ships with the cargo.
- Use the scale reading. Do not round down.
- Use the same gross weight for the quote and the air waybill.
The commercial invoice may show net weight. Do not quote from net weight.
Worked examples: actual vs volumetric weight
Example 1: bulky cargo
Two cartons, each 120 cm × 80 cm × 50 cm. Total gross weight is 100 kg.
Total volume = 120 × 80 × 50 × 2 = 960,000 cm³ Volumetric weight = 960,000 ÷ 6,000 = 160 kg Chargeable weight = 160 kg
The shipper said 100 kg. The airline rates 160 kg.
Example 2: dense cargo
One crate, 120 cm × 80 cm × 80 cm. Gross weight is 320 kg.
Volume = 120 × 80 × 80 = 768,000 cm³ Volumetric weight = 768,000 ÷ 6,000 = 128 kg Chargeable weight = 320 kg
The gross weight controls because it is higher.
Example 3: mixed pieces
Three cartons: 50 × 40 × 30 cm, 40 × 30 × 20 cm, and 30 × 20 × 15 cm. Total gross weight is 21 kg.
Volume = 60,000 + 24,000 + 9,000 = 93,000 cm³ Volumetric weight = 93,000 ÷ 6,000 = 15.5 kg Chargeable weight = 21 kg
The gross weight controls.
| Shipment | Gross weight (kg) | Total volume (cm³) | Volumetric weight (kg) | Chargeable weight (kg) |
|---|---|---|---|---|
| Bulky | 100 | 960,000 | 160 | 160 |
| Dense | 320 | 768,000 | 128 | 320 |
| Mixed | 21 | 93,000 | 15.5 | 21 |
Mistakes that under-quote an air freight shipment
Each mistake below tends to make the chargeable weight look lower than it is.
- Quoting before dimensions arrive. Gross weight alone misses the volumetric test. Make dimensions part of the enquiry.
- Using inner carton dimensions. The outside edges occupy the aircraft space. Measure the outside, including any bulging sides.
- Forgetting the pallet. A pallet adds height and weight. If the cargo ships on a pallet, the dimensions include it.
- Applying the wrong divisor. A 5,000 divisor produces a higher volumetric weight than 6,000. Check the carrier rate card.
- Calculating per piece and charging the highest piece. Chargeable weight is based on the whole consignment, not one package.
- Rounding dimensions down. Round each dimension up to the nearest whole centimetre, then calculate.
Where chargeable weight belongs in the quote
An air freight quote is usually a rate per kilogram. The quote line should show the chargeable weight, the rate, the currency and the basis. If the warehouse re-measures at acceptance and finds more volume, the airline invoice uses the higher chargeable weight. The quote must then be corrected.
The freight quotation checklist for Gulf forwarders covers the other fields that belong in a quote. When the quote is built in freight quotation software, the weight and the calculation stay with the job instead of living in a separate spreadsheet.
CargoSharks keeps the rate card and the quotation on one job record from enquiry to invoice. That means the chargeable weight used in pricing stays visible when costs are checked against the airline invoice.
