Freight Chargeable Weight Calculator
Calculate air freight chargeable weight from actual gross weight and volumetric (dimensional) weight. Supports cm, inches and metres with IATA ÷6000, express courier ÷5000, and custom divisors. Shows which weight the carrier will bill and by how much the two differ.
Enter carton dimensions, piece count and gross weight to instantly find the air freight chargeable weight — the weight the carrier will bill you on.
Formula
Volumetric Weight (kg) = (L × W × H × Pieces) ÷ Divisor | Chargeable = MAX(Actual, Volumetric)
Dimensions must be in centimetres for the standard divisor. The divisor converts cm³ to kg. IATA standard for air cargo is 6000 cm³/kg; express couriers typically use 5000. Chargeable weight is whichever is greater: actual gross weight or volumetric weight.
Worked Example
10 cartons, each 80 × 60 × 50 cm, total gross 85 kg, divisor 6000:
Volume per carton = 80 × 60 × 50 = 240,000 cm³
Total = 240,000 × 10 = 2,400,000 cm³ = 2.400 m³
Volumetric weight = 2,400,000 ÷ 6,000 = 400 kg
Actual = 85 kg → Chargeable = MAX(400, 85) = 400 kg
Despite 85 kg actual weight, the airline charges 400 kg. Packing more densely or reducing carton size would cut this significantly.
Frequently Asked Questions
What is chargeable weight and why does it matter?
Air freight and express courier services do not simply charge on actual weight. They charge on chargeable weight — whichever is greater between actual gross weight and volumetric (dimensional) weight. This system prevents shippers from occupying aircraft hold space with light, bulky goods at the same rate as dense, heavy cargo.
For a shipment that is light relative to its size — foam products, flat-pack furniture, inflatable goods — the volumetric weight will almost always exceed the actual weight, and the carrier will bill on volume. For dense goods — machinery, metal components, liquids — actual weight usually wins.
Knowing your chargeable weight before requesting a quote lets you compare airlines and couriers accurately, verify that quotes are correct, and decide whether to consolidate or repackage shipments before booking.
The formula — how chargeable weight is calculated
Step 1 — Calculate volumetric weight:
Volumetric weight (kg) = (L cm × W cm × H cm × number of pieces) ÷ divisor
IATA air freight
÷ 6,000
Standard airline cargo
Express couriers
÷ 5,000
DHL, FedEx, UPS
Some road / LCL
÷ 4,000
Carrier-specific, verify
Step 2 — Compare and choose:
Chargeable weight = max(actual gross weight, volumetric weight)
The carrier always uses the higher figure. A 20 kg parcel with 180 kg volumetric weight is billed at 180 kg.
Worked example: 15 cartons of camping chairs by air
Lightweight but bulky — a typical volumetric-dominant shipment.
| Item | Value |
|---|---|
| Carton dimensions (L × W × H) | 90 × 30 × 20 cm |
| Number of cartons | 15 |
| Volume per carton (90 × 30 × 20) | 54,000 cm³ |
| Total volume (15 × 54,000) | 810,000 cm³ |
| Actual gross weight | 75 kg |
| Volumetric weight — IATA (÷ 6,000) | 135 kg |
| Volumetric weight — courier (÷ 5,000) | 162 kg |
| Chargeable weight — IATA airline | 135 kg (volumetric wins) |
| Chargeable weight — express courier | 162 kg (volumetric wins) |
| Difference (courier vs airline basis) | +27 kg = 20% more on courier |
The actual weight is only 75 kg, but the airline charges on 135 kg and the courier on 162 kg — both based on volume. Consolidating these 15 cartons more tightly or using vacuum-compressed packaging could bring the volumetric weight closer to actual weight and reduce the freight charge.
When to use this calculator
- →Verifying airline or courier quotes — confirm that the stated chargeable weight matches the actual dimensions
- →Comparing IATA airline freight cost vs express courier cost for the same shipment dimensions
- →Deciding whether to repackage or consolidate before booking to reduce chargeable weight
- →Estimating air freight cost per unit when designing product or packaging specifications
Common mistakes when calculating chargeable weight
Using the wrong divisor for the carrier type
Applying the IATA ÷6000 divisor to a courier like DHL or FedEx gives a lower volumetric weight than they actually charge. Couriers use ÷5000, which produces 20% higher volumetric weights for the same dimensions.
Measuring inner product dimensions instead of outer carton dimensions
Carriers charge on the external dimensions of the assembled, sealed shipping carton — including all packaging material. Inner product dimensions are irrelevant. Always measure the outer box ready for shipment.
Using a single-piece weight instead of total shipment weight
Volumetric weight should be calculated on the total shipment (all pieces) and compared against the total actual gross weight. Calculating per piece and multiplying can introduce rounding errors.
Ignoring per-piece rounding
Most airlines and couriers round up each piece to the nearest 0.5 kg before summing. Across a 20-carton shipment, this can add 5–10 kg to the total chargeable weight. The carrier's quote may be slightly higher than this calculator for this reason.
Not comparing across carriers before booking
Carrier differences in divisors (6000 vs 5000) and fuel/security surcharges mean the cheapest rate-per-kg quote is not always the cheapest for your specific shipment dimensions. Always compare total charges, not just per-kg rates.
Using chargeable weight in your freight workflow
Once you have the chargeable weight, it feeds directly into:
- →Freight cost estimate — multiply chargeable weight by the carrier's rate per kg to get the air freight leg cost. Use the Freight Cost per KG Calculator.
- →Landed cost model — enter the air freight cost into the Landed Cost Calculator to calculate total cost per unit including duty and VAT.
- →Packaging spec sheet — record chargeable weight alongside carton dimensions in your product spec sheet so procurement and logistics teams have it for future orders.
- →Supplier quote comparison — when comparing quotes from two origins with different carton specs, run this calculator for each to ensure the freight comparison is on chargeable weight, not just actual weight.
Limitations
This calculator assumes uniform carton dimensions for all pieces. For shipments with mixed carton sizes, calculate each carton type separately and sum. Carrier rounding rules (typically up to the nearest 0.5 kg per piece) are not applied — your carrier's quote may be marginally higher. Fuel surcharges, security fees, remote area surcharges and peak season charges are not included. Always confirm the final chargeable weight and total charges with your airline or freight forwarder before booking.
Frequently asked questions
What is chargeable weight in air freight?
Chargeable weight is the weight the airline or courier uses to calculate your freight charge. It is whichever is greater: the actual gross weight of the shipment, or the volumetric weight calculated from the dimensions. If a shipment is large but light, you pay based on volume rather than actual weight.
How do I calculate volumetric weight?
Volumetric weight = (Length × Width × Height × number of pieces) ÷ volumetric divisor, with dimensions in centimetres. For example: 10 cartons each 80 × 60 × 50 cm = 2,400,000 cm³ ÷ 6,000 = 400 kg volumetric weight. If actual gross weight is 85 kg, chargeable weight is 400 kg.
Which weight is used for billing — actual or volumetric?
The carrier bills on the higher of the two. If your shipment is heavy and compact (dense), actual weight is billed. If it is light and bulky, volumetric weight is billed. Use this calculator to find out which applies before requesting a freight quote.
What divisor should I use for air freight?
The IATA standard divisor for most international air freight and airline cargo is 6,000 cm³/kg. Express couriers such as DHL, FedEx, and UPS typically use 5,000 cm³/kg. Some road freight and LCL sea freight operators use 4,000. Always confirm the divisor with your specific carrier.
How can I reduce chargeable weight?
Reduce outer carton dimensions to remove wasted space, increase packing density, consolidate multiple small shipments into fewer large ones, and use lightweight packaging materials. Even a few centimetres off each dimension reduces volumetric weight significantly across multi-carton shipments.
Does this calculator work for sea freight CBM?
For sea freight LCL, use the CBM Calculator instead. Sea freight is charged per cubic metre (CBM), not chargeable weight, though some LCL operators apply a weight/measure basis charging the greater of 1 CBM or 1,000 kg.