The Calculator
Dimensions (per carton):50 × 40 × 30 cm
Volume (per carton):0.06 CBM
Total actual gross weight:80 kg
Volumetric weight (per total):10 kg
Rate divisor:÷ 6000 (air)
Chargeable weight: 80 kg
Chargeable Weight Formula
For Air Freight
IATA Standard (international air freight)
Volumetric Weight (kg) = L × W × H (cm) ÷ 6000
Chargeable weight = the greater of (a) actual gross weight, or (b) volumetric weight. The divisor 6000 reflects the standard air cargo density limit of 167 kg/m³ (1,000,000 ÷ 6000 ≈ 167).
For Sea Freight LCL
Standard LCL formula (1 CBM = 1000 kg)
Volumetric Weight (kg) = L × W × H (m) × 1000
For LCL ocean freight, the standard is 1 CBM = 1000 kg chargeable weight. Some carriers use 1 CBM = 500 kg or 1 CBM = 750 kg for specific lanes or container utilization discounts, but 1:1000 is the industry default. For FCL, you pay the container rate, not chargeable weight.
For Express Courier (DHL / FedEx / UPS)
Express courier divisor (varies by carrier)
Volumetric Weight (kg) = L × W × H (cm) ÷ 5000
Express couriers use a divisor of 5000 (more expensive per kg than air freight, because of door-to-door service and faster transit). Some couriers apply dimensional weight on the outer package dimensions, not the actual product size.
Worked Examples
Example 1 — Small parcel by air freight
Cargo: 10 cartons, each 50 × 40 × 30 cm, 8 kg per carton
Step 1: Volume per carton = 50 × 40 × 30 = 60,000 cm³ = 0.06 CBM
Step 2: Total volume = 10 × 0.06 = 0.6 CBM
Step 3: Total actual weight = 10 × 8 = 80 kg
Step 4: Volumetric weight = 0.6 × 1,000,000 ÷ 6000 = 100 kg
Result: Volumetric (100 kg) > Actual (80 kg) → Chargeable weight = 100 kg
Example 2 — Heavy machinery by sea LCL
Cargo: 1 pallet 120 × 100 × 150 cm, gross 200 kg
Step 1: Volume = 1.2 × 1.0 × 1.5 = 1.8 CBM
Step 2: Volumetric weight = 1.8 × 1000 = 1800 kg
Step 3: Actual weight = 200 kg
Result: Volumetric (1800 kg) > Actual (200 kg) → Chargeable weight = 1800 kg
Tip: This shipment is 9× heavier volumetrically than physically — sea FCL would be much cheaper. At 1.8 CBM in a 28 CBM 20GP, you are paying for ~6% of the container. If you have additional cargo to fill the container, switch to FCL.
Example 3 — Dense consumer goods by air
Cargo: 5 cartons, each 30 × 30 × 30 cm, 12 kg per carton (cosmetics, dense bottles)
Step 1: Volume per carton = 30 × 30 × 30 = 27,000 cm³ = 0.027 CBM
Step 2: Total actual = 5 × 12 = 60 kg
Step 3: Volumetric weight = 5 × 27,000 ÷ 6000 = 22.5 kg
Result: Actual (60 kg) > Volumetric (22.5 kg) → Chargeable weight = 60 kg
Insight: Dense, heavy products (cosmetics, electronics, hardware) almost always get charged on actual weight by air. Choose air freight confidently for these — volumetric penalties are rare.
When to Choose Air vs Sea LCL Based on Density
The "break-even density" between air and sea LCL is roughly when the freight cost per kg of chargeable weight is similar. As a rule of thumb:
| Freight Mode | Best for Density (kg/m³) | Typical Transit | Cost per kg (2026 estimate) |
|---|---|---|---|
| Air freight (standard) | > 200 (dense) | 5-9 days | $3-6/kg |
| Air freight (NFO) | > 200 (urgent dense) | 2-4 days | $5-12/kg |
| Sea LCL | 50-500 | 25-40 days | $0.30-1.00/kg (W/M) |
| Sea FCL (40HQ) | Any (high volume) | 15-35 days | $2,500-5,000/container |
| Express (DHL/FedEx) | Any (small parcels) | 4-7 days | $6-15/kg |
Light, bulky items (cushions, foam, plush toys, inflatable products) are penalized heavily on air volumetric weight. Sea LCL is almost always cheaper. Heavy, dense items (batteries, hardware, machinery) can be sent by air without volumetric penalty.
How to Reduce Your Chargeable Weight
- Use smaller cartons: The single biggest lever. A 50×40×30 box (60,000 cm³) costs 100 kg volumetric. Two 35×30×30 boxes (31,500 cm³ each, total 63,000 cm³) cost 105 kg. The savings compound as carton count rises.
- Compress soft goods: Apparel, plush, foam, and textiles compress 30-50% with vacuum bags or compression wrap. The same product shipped compressed can move from 250 kg/m³ to 400+ kg/m³ density.
- Consolidate SKUs efficiently: Don't ship one SKU per carton if the carton is mostly empty space. Multi-SKU cartons often pack tighter.
- Re-measure after packaging: Factories often quote pre-packaging dimensions. After cartons are sealed and stacked, measure again — the actual dimensions may be 10-15% larger due to packaging overhang.
- Choose the right mode: If your cargo is light and bulky, sea LCL is dramatically cheaper than air. Use the calculator above to compare before booking.
Frequently Asked Questions
How is chargeable weight calculated for air freight?
For international air freight (IATA standard), volumetric weight = L × W × H (cm) ÷ 6000. Chargeable weight is the greater of actual gross weight and volumetric weight.
How is chargeable weight calculated for sea freight (LCL)?
For LCL ocean freight, the standard formula is 1 CBM = 1000 kg. Calculate volume in CBM (L × W × H in meters), then multiply by 1000. If actual weight is higher, that is used.
What is the difference between chargeable weight and gross weight?
Gross weight is the actual weight of cargo plus packaging measured on a scale. Chargeable weight is the weight used to calculate the freight cost — the greater of actual gross weight or volumetric (dimensional) weight.
Is volumetric weight the same as chargeable weight?
No. Volumetric weight is one of the two inputs that determine chargeable weight. The other is actual gross weight. Chargeable weight = max(volumetric, actual).
Why is the divisor 6000 for air freight?
The divisor 6000 comes from IATA's standard air cargo density limit of approximately 167 kg/m³ (1,000,000 ÷ 6000 ≈ 167). Aircraft are limited by both weight and space, so carriers charge for whichever is higher.
How do I reduce chargeable weight for my shipment?
Use smaller cartons, compress soft goods with vacuum bags, consolidate SKUs efficiently, re-measure after packaging, and choose sea LCL over air for light-bulky cargo.