How is CBM calculated?
Multiply carton length × width × height in meters, then multiply by carton count. With centimeters, use L × W × H × cartons ÷ 1,000,000.
Shipping readiness tool
CBM & volumetric weight calculator for 1688 products
Check carton volume, volumetric weight, actual weight, and chargeable weight before you ask for a China shipping quote or pay a 1688 supplier.
Route-aware freight estimatesTransparent ÷5,000 / ÷6,000 rulesFree, no sign-up
Calculate CBM and chargeable weight
Add product context (optional)Keep the original tool usable without a product match.
Product clue
Attach a product reference to this CBM session
Optional context only. Product matching cannot replace measured packed length, width, height, gross weight or carton count, and it will not change the CBM result.
1688AmazonShopifyAliExpressTikTok ShopOther product linksImageProduct name
Enter valid carton data, then calculate to see the shipment decision.
Quick answer
Use this page to decide the next shipping step
The useful output is not just a number. It shows what changes the decision and what to do before supplier payment.
What is chargeable weight?
For express and air planning, it is usually the higher of actual and volumetric weight. The final basis still depends on the carrier, route divisor, and warehouse measurement; sea/LCL is planned by volume or W/M rules instead.
How many kilograms is 1 CBM?
1 CBM is exactly 1 cubic meter of volume, not a fixed number of kilograms. Actual and chargeable weight depend on product density, packing, shipping mode, and the route divisor.
What should I do with the result?
Check whether every carton fits the selected load unit, then carry the measured carton data into a route-aware freight estimate. Confirm the final quote after warehouse measurement and carrier acceptance.
Billing rules
The same cartons can produce three different billing decisions
Choose the shipping mode before calculating. These are transparent planning defaults, not a carrier quote.
Parcel-level check
Express
L × W × H ÷ 5,000
Each parcel is commonly compared separately, so a mixed shipment can be partly actual-weight and partly volumetric.
The carrier divisor, rounding, and parcel rules can differ.
Consolidated shipment
Air freight
L × W × H ÷ 6,000
Planning compares total gross weight with total volumetric weight for the consolidated shipment.
The final route or carrier divisor can differ.
Volume or W/M
Sea / LCL
CBM · no kg divisor
Plan by shipment volume or W/M rules. FCL decisions also need a physical carton-fit check.
Forwarder minimums and route rules may apply.
Container capacity
Nominal volume is a ceiling, not a packing promise
Use the physical carton-fit result in the calculator. CBM alone cannot prove that every carton will pass the door, orient correctly, or load safely.
20' GP
- Nominal volume
- 33.1 m³
- Reference interior
- 589 × 235 × 239 cm
Planning use
Smaller FCL plans and denser cargo
40' GP
- Nominal volume
- 67.6 m³
- Reference interior
- 1203 × 235 × 239 cm
Planning use
Higher-volume FCL plans without extra height
40' HQ
- Nominal volume
- 76.2 m³
- Reference interior
- 1203 × 235 × 269 cm
Planning use
Higher-volume or taller-carton plans
Planning reference only. Door opening, palletization, carton orientation, void space, weight limits, equipment variation, and loading method reduce usable capacity.
Risk boundaries
Shipping risks this tool exposes early
Volumetric weight
A large, light carton can bill higher than its actual weight.
Shows the chargeable basis and a light-bulky flag.
Mode-specific billing rule
Express and air use route divisors; sea/LCL is planned by CBM or W/M, not a kilogram divisor.
Switch modes to see the relevant planning basis, then confirm the final carrier or forwarder rule.
Sensitive cargo
Battery, liquid, powder, or magnet signals can change route availability.
Routes these to a manual shipping check.
Warehouse measurement
Supplier estimates may not match the packed goods.
Keeps quote confidence low until cartons are measured.
FAQ
CBM calculator questions
What is CBM?
CBM means cubic meter. For a carton it is length × width × height in centimeters divided by 1,000,000, then multiplied by carton count.
How many kilograms is 1 CBM?
There is no fixed conversion. 1 CBM is one cubic meter of volume; its actual and chargeable weight depend on product density, packing, shipping mode, route rules, and measured cartons.
Are dimensional weight and volumetric weight the same?
They usually describe the same size-based shipping concept. The calculated kilograms still depend on the divisor and whether the carrier assesses each parcel or a consolidated shipment.
What is volumetric weight?
Volumetric weight is a shipping weight based on package size. Carriers may charge the higher of actual weight and volumetric weight.
Which divisor should I use?
Use the divisor as a planning assumption. Express and air routes often use different divisors, and the final divisor depends on carrier, line, route, and quote terms.
Why can the quote change after goods arrive at a warehouse?
Final quotes may use measured carton size and actual gross weight, not supplier listing estimates. Repacking can also change carton size and protection.
Does this calculator guarantee shipping price?
No. It calculates shipping-readiness metrics and risk flags. It does not guarantee freight price, carrier acceptance, route availability, customs clearance, or delivery time.
What should I submit after using the calculator?
Submit the product link, keyword, or image clue, destination country, carton dimensions, carton count, gross weight, shipping preference, and any battery or restricted-goods signal.
Related pages
Use the page that matches your next decision
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Need a shipping check before you pay a 1688 supplier?
Send the product link, destination, carton data, and gross weight. Supplymo turns the CBM result into a practical route and cost decision before assisted ordering.