By the HBK Customs Compliance Team | Updated October 2026
Your supplier’s packing list shows one CBM or weight. Your forwarder’s quotation or invoice shows a higher one. Two honest figures can describe the same shipment differently, and one of them can still be mistaken.
With chargeable weight for China freight, the gap usually has one of three causes: the figures describe different packing stages or measurements; billing rules set a chargeable quantity that differs from the scale weight, even when the cargo hasn’t changed; or something was recorded incorrectly. A likely cause doesn’t prove an invoice right. An unexplained difference still needs supporting records.
What This Guide Covers
This guide is for Philippine importers checking an estimate or freight invoice. It separates physical measurements, billing quantity and invoice total, then shows what to send us for a review. Our freight forwarding team has untangled this for importers shipping from China to the Philippines since 2011.
Are You Comparing CBM, Gross Weight or Chargeable Weight?
A supplier, a warehouse and a carrier can each hand you a “weight” and mean different things.
| Figure | What it represents | Why confusion happens |
| Net product weight | Weight of the goods without shipment packaging | It may be supplied when the quotation requires packed gross weight |
| Actual gross weight | Physical weight of the packed shipment, including relevant packaging and pallets | It can exceed the product-only weight |
| CBM | Shipment volume expressed in cubic meters | It describes space, rather than physical kilograms |
| Volumetric or dimensional weight | A weight equivalent derived from package dimensions under the applicable service rules | It can exceed actual weight for lightweight, bulky cargo |
| Chargeable weight or quantity | The billing quantity determined under the selected service’s rules | It may differ from both the supplier’s estimate and the scale reading |
Actual Weight vs Volumetric Weight
Actual weight is the physical weight of cargo on a scale. Volumetric weight is calculated by dividing volume by a divisor, so it reflects how much space the cargo occupies. Chargeable weight is usually the higher of actual weight and volumetric weight, which is why light, bulky cargo can bill above its scale weight.
One CBM Is Not 1,000 kg of Cargo
In LCL sea freight, 1 CBM is commonly treated as equivalent to 1,000 kg when comparing volume against weight. That’s a rating convention that catches many importers out. It says nothing about the actual scale weight or total physical weight of your goods: a cubic meter of foam pillows and one of floor tiles weigh nothing alike.
Why the Final Packed Shipment Can Differ From the Supplier’s Estimate
Supplier estimates are often made before the goods are packed. By the time cargo reaches a warehouse, things may have changed.
| Possible explanation | What it means for your figures |
| Product dimensions were supplied instead of packed dimensions | The goods and their completed shipping packages can occupy different amounts of space |
| Packaging changed after the initial estimate | Pallets, crates or protective packaging can change external dimensions and gross weight |
| The shipment quantity or package mix changed | A draft carton count, or dimensions from one carton size, may not describe the complete shipment |
| Measurements or records contain errors | Units, per-carton versus total figures, transcription errors or outdated records can create a mismatch |
Compare Records From the Same Packing Stage
Compare only records describing the same cargo, packing stage, package count and units. With bulky cargo, a few extra centimeter per side move the volume; with heavy cargo, crates and pallets show on the scale.
Hypothetical Example: Loose Cartons to Pallets
| A supplier’s estimate describes loose cartons. Before handover, the cargo is palletized. Product quantity is unchanged, but the final shipping unit has different external dimensions and a higher gross weight. That can explain a higher measurement; it doesn’t prove every invoice increase is justified. |
Why HBK Asks for Packing Details Early
HBK doesn’t palletize or repack cargo at our China consolidation hubs; we receive it as your supplier prepares it. If oversized boxes replace the carton size on the draft packing list, that happened before handover, and the supplier’s records should show it. We cover loose cartons versus pallets in a separate guide.
Why the Same Cargo Can Have a Different Billable Weight
If measurements match but the billed quantity differs, it’s a rating question. Carriers and shippers use different calculations, and the dimensional factor varies by shipping method.
Air Freight and Air Cargo
For China air freight, chargeable weight compares actual gross weight with volumetric weight based on length, width and height. Under IATA air cargo conventions, volume in cubic centimeter is commonly divided by 6,000, roughly 167 kg per CBM. Air carriers can set their own terms, so any quote for air freight from China should state its basis. Our air freight chargeable weight explainer covers the chargeable weight calculation.
Express Courier
Express services often use a different divisor. DHL Express divides volume in cubic centimetres by 5,000, so the same carton can produce a higher dimensional weight by courier than under an air freight service using 6,000.
LCL Sea Freight and Ocean Freight
LCL is usually priced on weight or measure: cubic meter are compared with metric tonnes, and the larger becomes the billing quantity. The Philippine Ports Authority defines a revenue ton for port tariffs the same way, as one cubic metre or 1,000 kg, whichever yields more. HBK’s LCL shipping follows this weight-or-measure pricing for LCL: we charge on volume or weight, whichever is higher.
Rounding, Minimums and Non-Stackable Cargo
Rounding, minimum charges or non-stackable rules can affect billing where the quotation or tariff provides for them. A minimum can raise the billed quantity without changing the cargo’s physical CBM, so label the two figures separately.
What “the Higher Figure” Really Means
Don’t assume two quotes used the same volumetric divisor; check it against the service booked. “The higher figure” is a defined comparison under a stated rule, not license to pick the larger of two conflicting measurements. These are industry conventions, not HBK’s tariff.
Did the Measurement Change, or Did the Total Bill Change?
When an invoice comes in above the estimate, separate three possibilities:
• The measured dimensions or gross weight changed.
• The physical measurements stayed the same, but a different billing rule applied.
• The chargeable quantity stayed the same, but the rate or included services changed.
Charges That Don’t Change the Cargo
An added handling or final delivery charge doesn’t mean the shipment grew. That’s about quotation scope; see what an all-in freight rate includes. One lumped “shipping cost” hides the cause of unexpected freight charges.
When Does a Higher Figure Still Need Clarification?
A difference can be legitimate or a mistake. It stays unresolved when:
• Both records describe the same completed shipment but show different measurements, with no explanation.
• The billed quantity can’t be connected to the recorded weight, dimensions or stated rating rules.
• Package counts, units or measurement dates are missing.
• A packing change is cited, but no records show what changed.
The Sensible Next Step
Review the supporting records and, where practical, confirm with the warehouse or carrier that measured. That isn’t an accusation, nor a reason to accept the gap as normal. There’s no universal “acceptable variance.”
What HBK Needs to Review the Difference
Our customs compliance team already checks the bill of lading, commercial invoice and packing list against each other before cargo arrives. Measurement records get the same discipline.
| Information | What it helps establish |
| Supplier’s latest packing list and shipment reference | Whether both figures concern the same shipment and package count |
| Final packed dimensions, measurement units and gross weight | Whether the estimate describes the completed shipping units |
| Available packing photographs and records of packing changes | Whether the shipment’s presentation changed |
| Warehouse or carrier measurement records, where available | The basis of the later measurements |
| Quotation, booking details and relevant invoice lines | Which service, rate unit and billing rules were applied |
What a Review Can and Can’t Do
We’ll review the records and clarify the quotation basis. We can’t promise a refund or revised invoice, especially on another provider’s bill. For your next air freight quote or booking, final packed details up front keep estimate and invoice aligned.
| Send HBK your supplier’s packing details, available measurement records and freight quotation. Request a shipment review of the shipment information and the basis used for your China-to-Philippines freight estimate. |
