How air freight charges are calculated confuses many first-time shippers, because the quote is a stack of lines and the largest one, the rate per kilogram, is applied to a weight you may not have expected. This guide takes an air freight charge apart in the order a forwarder builds it: chargeable weight, the base rate, surcharges and accessorial fees, handling and local charges, and customs costs. It then works through a complete invoice with made-up numbers and shows what repacking does to the bill.
For a closer look at the weight rule, see what chargeable weight is. For the lines on any forwarder's quote, see how freight forwarding rates are calculated.
The Building Blocks of an Air Freight Charge
| Line | What it is | How it is usually based |
|---|---|---|
| Base rate | The airline's price for carrying the cargo from airport to airport | Chargeable weight, per kilogram |
| Fuel surcharge | An accessorial fee linked to fuel costs | Often per kilogram, so ask |
| Security surcharge | An accessorial fee linked to security measures | Often per kilogram, so ask |
| Dangerous goods fee | A fee for cargo that needs special handling as dangerous goods | Per shipment or per package, so ask |
| Terminal handling | Handling of the cargo at the airport terminal | Flat or per kilogram, so ask |
| Pickup and delivery | Transport to the origin airport and from the destination airport | Distance and weight |
| Customs charges | Clearance fees, plus duties and taxes | Fees set by the provider, duty set by law |
| Insurance and storage | Optional cover, and storage if cargo waits | Value and time |
IATA's guidance names fuel surcharges, security surcharges, dangerous goods fees and terminal handling fees as examples of accessorial fees, meaning charges beyond the standard shipping cost for special handling needs. It lists pickup and delivery, storage, insurance, customs charges, duties and taxes among the other service charges.
Step 1: Work Out the Chargeable Weight
IATA says carriers can charge by volumetric weight or actual weight and use the higher figure for pricing. It gives the general volumetric rule as the shipment's volume in cubic centimetres divided by 6,000. Every line that is charged per kilogram uses this figure, so an error here runs through the whole bill.
Step 2: Apply the Base Rate
The base rate depends on how the forwarder buys space. IATA describes published tariffs, also called general cargo rates or TACT rates, which are set by each carrier or at industry level and are openly accessible. It also describes rates agreed between an airline and a forwarder, including general, promotional, contract and spot rates. Spot or ad hoc rates, it says, can be called dynamic pricing and depend on capacity, the relationship and priorities.
Published carrier tariffs cover only airport-to-airport transport unless other services are indicated. The rates actually agreed between forwarders and airlines are negotiated, confidential and may differ from the published tariff. In practice, your forwarder's written quote is the number to use, not a published table.
Step 3: Add Surcharges and Accessorial Fees
Surcharges move with conditions. IATA names fluctuating oil prices, government restrictive measures and geopolitical concerns among the market conditions that affect prices. Ask which surcharges your quote includes, how each is calculated and whether any can change before the flight.
Step 4: Add Handling and Local Charges at Both Ends
Terminal handling, documents, export clearance at origin and delivery at destination are usually separate lines. A quote that stops at the destination airport leaves out the clearance and delivery you will still need. Our guide to how sea freight pricing works shows the same layered logic for the other mode.
Step 5: Add Customs, Duty and Taxes
Duty is not part of the freight charge, but freight feeds into it. Section 14 of the Customs Act, 1962 says the transaction value of imported goods includes, to the extent and in the manner the rules specify, the costs of transportation to the place of importation and insurance. For a self-assessed entry, Section 47 makes duty payable when the bill of entry is presented, so the cash has to be ready before the aircraft lands.
A Worked Invoice With Made-Up Numbers
The numbers below are made up to show the method. A shipment is 12 cartons, each 55 x 45 x 40 cm and 14 kg.
| Line | Basis | Amount |
|---|---|---|
| Actual weight | 12 cartons x 14 kg | 168 kg |
| Volumetric weight | 12 x (99,000 cm3 divided by 6,000 = 16.5 kg) | 198 kg |
| Chargeable weight | The higher of the two | 198 kg |
| Base rate | 198 kg x 4.20 | 831.60 |
| Fuel surcharge | 198 kg x 0.60 | 118.80 |
| Security surcharge | 198 kg x 0.15 | 29.70 |
| Origin handling | Flat | 90.00 |
| Destination handling | Flat | 110.00 |
| Customs clearance fee | Flat | 60.00 |
| Delivery | Flat | 80.00 |
| Total before duty and taxes | 1,320.10 |
That is 6.67 per chargeable kilogram, or 7.86 per kilogram of actual weight. The shipment weighs 168 kg but is billed as 198 kg, because the cartons are bulky for what they hold.
What Repacking Does to the Bill
Suppose the same goods fit into smaller cartons of 50 x 40 x 35 cm, with the same 14 kg weight. The volumetric weight per carton drops to 11.67 kg, which is below the actual weight, so the cartons are now charged on their real weight.
| Line | Original cartons | Repacked cartons |
|---|---|---|
| Carton size | 55 x 45 x 40 cm (99,000 cm3) | 50 x 40 x 35 cm (70,000 cm3) |
| Volumetric weight per carton | 16.5 kg | 11.67 kg |
| Chargeable weight per carton | 16.5 kg | 14 kg |
| Chargeable weight, 12 cartons | 198 kg | 168 kg |
| Rate, fuel and security (4.95 per kg) | 980.10 | 831.60 |
| Flat charges | 340.00 | 340.00 |
| Total | 1,320.10 | 1,171.60 |
The saving is 148.50, about 11% of the original total, from packing alone. In real life the saving depends on whether your goods and their protection allow smaller cartons, so measure before you assume.
Why Small Shipments Cost More Per Kilogram
Per-kilogram charges scale with weight, but flat charges do not, so the cost per kilogram falls as a shipment grows. Using the made-up rates above (4.95 per kilogram for rate, fuel and security, and 340 in flat charges), the cost per chargeable kilogram changes like this.
| Chargeable weight | Total | Cost per chargeable kg |
|---|---|---|
| 50 kg | 587.50 | 11.75 |
| 198 kg | 1,320.10 | 6.67 |
| 1,000 kg | 5,290.00 | 5.29 |
The flat charges are a third of the bill for the 198 kg shipment and a far larger share for the smallest one. That is why combining small shipments, covered in our guide to reducing air freight costs, can save money even when the weight does not change.
Currency and Payment Terms
IATA notes that air waybill charges are either prepaid by the shipper or collected from the consignee, and that payment should match the currency on the air waybill, which is the origin currency. Ask your forwarder which currency your quote is in, which party is paying each part of the charge and when the invoice is due. If the consignee collects, make sure they know the amount and are ready to pay on arrival, because cargo that is not released waits, and waiting costs money.
Checking the Final Invoice
Compare the invoice with the quote, line by line. Check that the chargeable weight is the one you were quoted, that the rate per kilogram matches, that every surcharge is one you expected and that no extra line has appeared. If something differs, ask for the explanation in writing: a re-measured shipment, a changed surcharge or an extra service are the usual causes. Keep the quote, the air waybill and the invoice together so that you can see where a difference came from, and use what you learn to improve the next quote request.
Why Two Air Freight Quotes Differ
- One uses actual weight and the other uses the higher volumetric weight.
- One lists surcharges and the other bundles them or adds them later.
- One covers airport to airport and the other includes pickup, clearance and delivery.
- One is a spot rate for a specific flight and the other a contract rate.
- One includes insurance or storage and the other does not.
- The validity or the flight differs, so the market conditions differ.
Questions to Ask About an Air Freight Quote
- What chargeable weight is this quote based on, and how was it measured?
- Is the rate a contract rate or a spot rate, and how long is it valid?
- Which surcharges and handling charges are included, and which are extra?
- Does the price end at the airport or at my door?
- Is there a minimum charge for a shipment this size?
- Who pays for storage if the cargo waits for clearance?
Get an Itemised Air Freight Quote From RR Brothers and Logistics
RR Brothers and Logistics gives itemised quotes for air freight, with the chargeable weight basis, surcharges and local charges shown separately. Send us your cargo details with the packed dimensions and weights, and we will show you how each line is built.
Frequently Asked Questions
The chargeable weight is multiplied by the rate per kilogram, then surcharges, handling and local charges are added. Customs duty and taxes are separate and depend on the goods and the tariff.
The higher of the shipment's actual weight and its volumetric weight. IATA gives the general rule for volumetric weight as volume in cubic centimetres divided by 6,000.
IATA names fuel surcharges, security surcharges, dangerous goods fees and terminal handling fees among the accessorial fees. Ask which ones your quote includes and whether they can change.
They may use different weight bases, rate types, surcharges, validity periods and scopes. Put every quote on the same basis before comparing totals.
It can. Under Section 14 of the Customs Act, the transaction value includes, as the rules specify, the cost of transport to the place of importation and insurance.
Yes, if the cargo is charged on volume. Smaller cartons lower the volumetric weight, as the example shows, but only if the goods and their protection allow it.
Sources
- IATA: Air cargo tariffs and rules (rates, surcharges, volumetric weight)
- CBIC: Customs Act, 1962 (Sections 14 and 47)
This article is general information, not legal, tax or customs advice. Rules, rates and procedures change; confirm current requirements with the relevant authority or a licensed customs professional before you ship. Regulatory references were checked against the official sources listed above on 25 October 2026.
Image credits: header photo by Patrick Campanale on Unsplash. Used under the Unsplash License.
Request a Quote
