Free tool
CBM, Chargeable Weight and Amazon Carton Calculator
Enter your carton size, weight and count. You'll see the volume sea freight is priced on, the chargeable weight for air and express, and whether the cartons fit Amazon's US carton limits.
- Total volume (sea freight)
- – CBM
- Total actual weight
- – kg
- Air freight chargeable weight (÷ 6,000)
- – kg
- Express chargeable weight (÷ 5,000)
- – kg
Divisors vary by carrier and contract, and Amazon's limits vary by marketplace. Use these figures to plan, then confirm with your quote and in Seller Central.
How the Numbers Are Calculated
| Figure | Formula | Used for |
|---|---|---|
| CBM | L × W × H (cm) ÷ 1,000,000 × cartons | Sea freight (LCL) pricing |
| Air volumetric weight | L × W × H (cm) ÷ 6,000 × cartons | Air freight |
| Express volumetric weight | L × W × H (cm) ÷ 5,000 × cartons | Express couriers |
| Chargeable weight | Greater of actual and volumetric weight | What air and express bill on |
| Amazon US carton check | Each side ≤ 25 in (63.5 cm), weight ≤ 50 lb (22.7 kg) | Standard FBA cartons |
Related: Amazon FBA box size and weight limits · how freight costs from China are calculated · glossary · all free tools
FAQ
How is CBM calculated?
Multiply length × width × height in metres. In centimetres: L × W × H ÷ 1,000,000. Multiply by the number of cartons for the shipment total.
What is volumetric (dimensional) weight?
A weight based on size rather than mass: L × W × H in cm divided by a divisor. Air freight commonly uses 6,000 and express couriers 5,000. You're billed on whichever is greater, actual or volumetric weight: the chargeable weight.
What are Amazon's carton limits?
For standard cartons sent to US fulfillment centers, no side may exceed 25 inches and a carton may not weigh more than 50 lb, unless it holds a single oversized item. Other marketplaces have different limits, so confirm in Seller Central.
Is this a freight quote?
No. It shows the volume and weights a forwarder will bill on. Rates depend on route, season and service, so ask us for an actual quote.
Turn These Numbers Into a Quote
Send the carton details and destination, and we'll quote sea, air and express side by side.