Air Freight Chargeable Weight Calculator
Air freight is charged on the higher of gross weight and volumetric weight. Calculate IATA and integrator chargeable weights for multi-piece shipments.
Quick Answer
1:6000 Ratio
W/M Revenue Tons
Volumetric chargeable weight is significantly higher for air shipments compared to sea LCL due to density thresholds.
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Overview & methodology
Formula
Volumetric weight (kg) = L × W × H (cm) × quantity ÷ divisorChargeable weight = max(gross weight, volumetric weight)Confirm the divisor, aggregation and rounding rules with your carrier.
| Illustrative piece | Gross weight | Volumetric weight at 6000 |
|---|---|---|
| 100 × 80 × 60 cm | 30 kg | 80 kg |
Use the volumetric weight formula guide and the CBM calculator for volume and container fit.
The 1:6 Air Freight Volumetric Ratio
International air cargo follows the 'Volume-to-Weight' ratio of 1 to 6 (sometimes called the IATA divisor). This means 1 cubic meter is considered to weigh 167 kilograms for billing purposes. If your cargo's actual weight is lower than this threshold, you are billed on the volumetric weight instead. For example, shipping 1 cubic meter of pillows (50kg actual) results in a 167kg chargeable weight, so you pay freight for 167kg even though the cargo only weighs 50kg. This ensures carriers are compensated for light, bulky cargo that occupies significant cabin space.
How chargeable weight is calculated
Chargeable weight = Maximum of (Gross Weight, Volumetric Weight). For each piece, the volumetric weight is calculated as: Volume (L × W × H in cm) ÷ 6000 = Volumetric Weight (kg). The gross weight is simply the actual weight of the piece. Airlines then sum all pieces and round up to the nearest 0.5kg for billing. This tool automates the calculation for multi-piece shipments.
Numerical Example: Volumetric vs. Gross Weight Example
The volumetric weight (167 kg) is higher than the actual weight (100 kg), so you pay for 167 kg. This is typical for light, bulky cargo like pillows, foam, or packaging materials.
IATA standards and integrator alternatives
The standard divisor of 6000 cm³/kg is published by the International Air Transport Association (IATA) in the Air Cargo Tariff (TACT). However, some express couriers (FedEx, UPS, DHL) use a more aggressive divisor of 5000 cm³/kg (1:5 ratio) for their premium services or domestic routes. Always verify the divisor in your freight quote-using 5000 instead of 6000 increases the chargeable weight by 20%, directly impacting your cost.
Minimum charges and rate rounding
Most airlines apply a minimum charge (typically $50–$200) even if the chargeable weight is very low. This protects the carrier from issuing invoices for tiny shipments. Additionally, freight rates are often pro-rated in bands: for example, rates may decrease as weight increases (e.g., $5/kg for 0–50kg, $4.50/kg for 50–500kg, $4/kg for 500kg+). Always ask for the exact rate band breakpoints in your quote.
Comparing air vs. ocean freight
For light, bulky cargo, air is often more economical than ocean LCL because the volumetric weight inflates ocean charges significantly. Ocean uses Weight/Measure (W/M) revenue tons (the larger of W or M), whereas air only applies the volumetric ratio to calculate chargeable weight. However, for dense cargo (actual weight > volumetric weight), ocean LCL may be cheaper even after volumetric surcharges. Use this calculator alongside our CBM Calculator and LCL vs FCL Break-Even tool to compare modes.
Related tools: Compare chargeable weights against our CBM Calculator for sea freight, or check the LCL vs FCL Break-Even to decide whether air or ocean is more economical for your shipment.
Method note: calculations run in your browser using the formulas and published rule books cited on this page. Results are free estimates for planning, with no login required, and should be confirmed with your bank, broker or the official source before you commit.
Frequently asked questions
What is the IATA volumetric divisor?
6000 for general cargo (L × W × H in cm ÷ 6000 = kg). Express integrators (DHL, FedEx, UPS) commonly use 5000 for premium products. Some carriers use 4800 or 4166 on specific lanes.
How is chargeable weight rounded?
Airlines typically round chargeable weight up to the nearest 0.5 kg per piece for consolidations and per shipment for direct AWBs. Rate breaks apply above +45 kg, +100 kg, +300 kg, +500 kg and +1000 kg - a lower rate can offset actual weight, so it may pay to declare higher.
What is chargeable weight in air freight?
Chargeable weight is the higher of actual gross weight and volumetric weight. Volumetric weight is L x W x H in cm divided by 6000 under IATA general cargo practice. Example: a 120 x 80 x 100 cm pallet weighing 150 kg has a volumetric weight of 160 kg, so 160 kg is billed.