How to Calculate Volumetric Weight for Air Freight
Volumetric weight determines how much you actually pay for air freight — and it surprises many first-time shippers. If your cargo is bulky but light, you’ll pay based on size, not weight. Here’s exactly how it works.
The Formula
Volumetric Weight (kg) = Length (cm) × Width (cm) × Height (cm) ÷ 6,000
If you measure in inches: Length × Width × Height ÷ 166
The result is compared to the actual weight. Whichever is greater becomes the chargeable weight — the weight you pay for.
Step-by-Step Calculation
Step 1: Measure the length, width, and height of each package in centimeters. Always round up to the nearest whole centimeter. Measure the widest/tallest/longest point — including any irregular edges.
Step 2: Multiply: L × W × H ÷ 6,000 = volumetric weight in kg.
Step 3: Weigh your cargo on a scale to get the actual weight in kg.
Step 4: Compare. The chargeable weight = MAX(actual weight, volumetric weight).
Real Examples
| Cargo | Dimensions (cm) | Actual Weight | Volumetric Weight | Chargeable Weight | You Pay For |
|---|---|---|---|---|---|
| Electronics box | 60×40×30 | 25 kg | 12 kg | 25 kg | Actual (heavier) |
| Clothing carton | 80×60×50 | 15 kg | 40 kg | 40 kg | Volumetric (bulkier) |
| Machine parts crate | 120×80×60 | 180 kg | 96 kg | 180 kg | Actual (heavier) |
| Foam/packaging pallet | 120×100×150 | 45 kg | 300 kg | 300 kg | Volumetric (6.7× actual!) |
| Pharma carton | 40×30×30 | 8 kg | 6 kg | 8 kg | Actual (heavier) |
Notice the foam pallet: it only weighs 45 kg but takes up 300 kg worth of space in the aircraft. You’d pay for 300 kg — nearly 7× the actual weight. This is why packing efficiently matters enormously for air freight costs.
Divisors by Transport Mode
| Transport Mode | Divisor (cm) | Divisor (inches) | 1 m³ = |
|---|---|---|---|
| Air freight (IATA) | 6,000 | 166 | 167 kg |
| Sea freight (LCL) | N/A | N/A | 1,000 kg (1 CBM = 1 freight ton) |
| Courier (DHL/FedEx/UPS) | 5,000 | 139 | 200 kg |
| Road freight | 3,000–4,000 | varies | 250–333 kg |
Important: Couriers like DHL, FedEx, and UPS use a divisor of 5,000 (not 6,000) — which means the same box costs more via courier than via direct air freight. This is one reason large shipments (over ~100 kg) are usually cheaper with cargo airlines than couriers.
Tips to Reduce Volumetric Weight
- Pack tightly — eliminate dead space inside boxes. Use filler that doesn’t add volume.
- Use smaller packaging — switch from standard to custom-sized cartons.
- Flatten where possible — reduce height, the most expensive dimension.
- Consolidate — combine multiple small packages into one dense shipment.
- Remove unnecessary packaging — retail packaging adds volume with no shipping benefit.
- Consider sea freight for very bulky, non-urgent cargo — the divisor is much more favorable.
Try Our Calculator
Enter your dimensions and weight in our Air Freight Calculator to instantly see your chargeable weight and estimated cost by route.
Frequently Asked Questions
What is volumetric weight?
Volumetric weight (also called dimensional weight or DIM weight) is calculated as L × W × H (cm) ÷ 6,000. Airlines use it to price space-consuming cargo fairly.
Why do airlines use volumetric weight?
Aircraft have limited space AND weight capacity. Lightweight but bulky cargo (like clothing or foam) takes up valuable space that could carry heavier goods. Volumetric weight ensures fair pricing for space used.
What is the divisor for air freight?
The standard IATA divisor is 6,000 (cm) or 166 (inches). Couriers like DHL/FedEx use 5,000, making them more expensive for bulky cargo.
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