What does this tool tell me?
Whether a 1688 product may be charged by size instead of actual weight, before you request a China shipping quote.
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.
Volumetric, actual & chargeable weightLight-bulky risk flagBuilt for the China shipping quote
Shipping weight before quote
A low unit price can fail when carton size pushes the order into volumetric billing.
Inputs
Carton size, carton count, gross weight, shipping mode
Output
CBM, volumetric weight, chargeable weight, risk flag
Boundary
Final billing still depends on warehouse measurement and carrier rules
The tool
Calculate CBM and chargeable weight
Enter your cartons and shipping mode. The calculator flags when an order is likely billed by size instead of weight.
Free, no sign-up. Results update live as you type.
Shipping mode
Carton dimensions (cm)
Length
Width
Height
Carton count
Gross / carton (kg)
Container
Charged by CBM (volume), not volumetric weight
Total CBM
28.8 m³
Chargeable wt
4500 kg
Volumetric wt
28.8 kg
Actual wt
4500 kg
Charged by actual weight · ~243 cartons fit in 20' GP (≈70.5% packed) · this order uses 87% of its volume
Loading 3D…
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 changes the result?
Carton dimensions, gross weight, carton count, the shipping mode divisor, route rules, and the final warehouse measurement.
What is the next step?
If the result looks bulky or low-confidence, submit the product link, destination, and packing data for a shipping readiness check before paying.
Best fit
Best for products where shipping can erase the price advantage
Strongest for large, light, fragile, multi-carton, or small-batch 1688 products where packed size matters as much as unit cost.
Light bulky items
Find products where volume, not weight, drives freight cost.
Small-batch tests
Check whether a sample or first order is shipping-heavy.
3PL handoff
Prepare carton data before sending goods to a warehouse.
Air vs sea choice
Compare CBM and chargeable weight before picking a route.
Supplier data gaps
Expose when listing dimensions are not quote-ready.
Landed cost prep
Feed shipping weight into the landed-cost decision.
Workflow
CBM check workflow
1
Collect
Carton dimensions, carton count, gross weight, and destination.
2
Calculate
CBM, volumetric weight, actual weight, and the chargeable basis.
3
Flag
Light-bulky, sensitive cargo, missing measurement, or route divisor risk.
4
Review
Warehouse measurement and carrier/route rules before quote approval.
5
Quote
Use measured package data in landed cost and shipping readiness.
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.
Route-specific divisor
Express, air, and sea carriers use different divisors.
Lets you switch shipping mode and treats the divisor as a planning 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.
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
Air vs sea freightChoose the right route from ChinaLanded cost calculatorAll-in cost to your doorIncoterms (FOB, DDP)Who pays freight, duty, and risk1688 shipping to 3PLReceiving, prep, and handoffProduct checkWritten pre-payment decisionRestricted productsScreen before you orderSample reportsSee a full report first
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.