Volumetric Weight Calculator — DIM Weight for Air & Courier
Answer: Volumetric weight (kg) = (L × W × H in cm × quantity) ÷ divisor. IATA air freight uses 6000; international courier (DHL, FedEx, UPS) uses 5000.
Carriers bill the higher of actual gross weight and this volumetric figure. To compute the chargeable weight, use the chargeable weight calculator.
What is volumetric weight?
Volumetric weight (also called dimensional weight or DIM weight) is a kg figure derived from a shipment’s volume. Air freight and courier carriers bill on the higher of actual gross weight and volumetric weight, so a bulky-but-light shipment is priced on space rather than mass.
volumetric weight (kg) = (L × W × H in cm × quantity) ÷ divisorThe divisor is the cm³ of cargo a carrier treats as 1 kg. IATA air freight uses 6000; most international express services (DHL, FedEx, UPS) use 5000.
How the calculator works
Enter the outer carton dimensions, quantity, and the divisor your carrier uses. The tool converts your dimensions to centimeters, multiplies L × W × H to get volume in cm³, multiplies by quantity, and divides by the divisor to give volumetric weight in kg.
If you don’t know the exact divisor, pick the IATA preset for general air freight or the courier preset for express services. For non-standard carriers (regional integrators, e-commerce parcel networks), enter a custom divisor from the rate card.
Divisors by service (as of May 2026)
| Service | Divisor | Density threshold | Notes |
|---|---|---|---|
| IATA air freight | 6000 | 167 kg/m³ | Industry default for airline-tendered air cargo. |
| DHL Express, FedEx IP, UPS Worldwide | 5000 | 200 kg/m³ | International express; 20% higher bill than IATA on the same cargo. |
| FedEx Ground / UPS Ground (US) | 139 in³/lb | ~10.4 lb/ft³ | Inch-pound divisor; convert to 5000 cm³/kg equivalent. |
| Amazon Partnered Carrier (PCP) | 5000 | 200 kg/m³ | Confirm on the latest FBA rate sheet. |
| Ocean LCL | 1000 (CBM × 1000 kg/m³) | 1000 kg/m³ | Sea freight billed by CBM; only dense cargo bills by actual weight. |
Density threshold = the cargo density below which volumetric weight wins. Anything lighter than the threshold is priced on volume.
Worked example
One carton, 60 × 40 × 50 cm, quantity 4.
- Volume per carton: 60 × 40 × 50 = 120,000 cm³
- Total volume: 120,000 × 4 = 480,000 cm³ (0.48 m³)
- Volumetric weight @ IATA 6000: 480,000 ÷ 6000 = 80 kg
- Volumetric weight @ courier 5000: 480,000 ÷ 5000 = 96 kg
If your actual gross is 60 kg, you are billed on 80 kg (IATA) or 96 kg (courier) — the carrier wins either way because the cargo is below the density threshold.
When does volumetric weight bite?
For air freight, cargo below ~167 kg/m³ pays on volume. That is most consumer goods: apparel, pillows, lampshades, plastic homeware, packaging foam. Heavy categories — books, ceramics, machinery parts, hardware — typically price on actual weight.
A quick test: divide your gross weight in kg by your CBM. If the number is below 167, you will be billed on volumetric for IATA air; below 200 for international express.
Common mistakes
- Using product dimensions instead of outer carton. Carriers measure the box, including tape and protruding labels. Always use packed outer dimensions.
- Forgetting the pallet. A palletised shipment is measured to the pallet footprint and full pallet height. A 120 × 100 × 150 cm pallet adds 1.8 m³ of volumetric weight even if the cartons inside are smaller.
- Assuming 6000 for express. International express divisors are 5000. The 20% delta is the most common rate-shock complaint we see in seller quotes.
- Mixing inches and centimeters in one shipment. Convert everything to the unit your carrier expects (cm for IATA / metric carriers, in for US domestic carriers) before submitting the airway bill.
FAQs
Is volumetric weight the same as chargeable weight?
No. Volumetric weight is one input. Chargeable weight is max(actual weight, volumetric weight) — the figure the carrier actually bills.
Why do carriers use different divisors? Each carrier picks a divisor that protects their economics. A lower divisor (5000) yields a higher volumetric weight, so the carrier collects more on light cargo. IATA’s 6000 is a freight-industry compromise; express carriers tightened to 5000 to price ecommerce parcels.
Does volumetric weight apply to ocean freight? LCL ocean freight prices on CBM, with an effective divisor of 1000 (1 CBM = 1000 kg). For FCL (full container), you pay per container regardless of weight — until you hit a payload limit (~22 tonnes for a 20ft GP, ~26 tonnes for a 40ft).
What about Amazon FBA inbound? Amazon’s Partnered Carrier Program follows courier divisors (5000) for small parcel and a separate calculation for LTL pallet shipments. Confirm against the current FBA inbound rate sheet, which Amazon updates seasonally.
Dated facts (as of May 2026)
- IATA air freight still commonly uses 6000 cm³/kg for international general cargo dimensional weight.
- DHL Express, FedEx International Priority, UPS Worldwide, and many ecommerce parcel services commonly use 5000 cm³/kg for international express.
- Ocean LCL is still quoted primarily by CBM, with 1 CBM = 1000 kg used as the standard volume-to-weight comparison for dense cargo.
After the calculation
Volumetric weight is one input; the full air or courier rate depends on origin/destination, fuel surcharge, security fee, and any oversized/overweight piece surcharges. Use the figure here to compare quotes apples-to-apples, then pair it with the chargeable weight calculator to confirm the billed weight.
Frequently asked questions
- Is volumetric weight the same as chargeable weight?
- No. Volumetric weight is one of the two inputs to chargeable weight. Chargeable weight is the higher of actual gross weight and volumetric weight — that is the figure the carrier actually bills.
- What is the IATA divisor for volumetric weight?
- The IATA standard divisor for general air freight is 6000 cm³ per kg. International express carriers (DHL, FedEx, UPS) use 5000, which produces a 20% heavier volumetric weight on the same cargo.
- Below what density does volumetric weight beat actual weight?
- For IATA air (divisor 6000) the threshold is 167 kg/m³. For courier (divisor 5000) it is 200 kg/m³. If your cargo density is below the threshold, the carrier bills on volumetric weight.
- Do I use the inner product size or the outer carton size?
- Always use the outer packed dimensions including tape, labels, and any protrusions. Carriers physically measure the box on the warehouse floor, so inner dimensions understate the volumetric weight and lead to rebill surprises.
- How does volumetric weight work for palletised shipments?
- The pallet footprint and full pallet height (cargo plus pallet base) determine the volumetric weight. A standard 120 × 100 × 150 cm pallet contributes 1.8 m³ regardless of how the cartons sit on it, so loose loading wastes volumetric weight you have already paid for.
- Does ocean freight use volumetric weight?
- Ocean LCL bills on CBM directly, which is equivalent to a divisor of 1000 (1 CBM = 1000 kg). FCL bills per container until you hit a payload limit, so volumetric weight is rarely a factor for full-container ocean cargo.