An LCL quotation marked “USD/RT” or “USD/W/M” may look straightforward, but errors often arise from the rating basis: using product dimensions instead of packed dimensions, net instead of gross weight, ignoring minimum charges, or applying one Revenue Ton figure to every local charge. The result is a pre-booking budget below the final CFS debit note. This article explains W/M, Revenue Ton, CBM-versus-weight calculations, charge-code review and measurement controls for reliable LCL cost estimates.

Operational update: 17 July 2026 · B2B Logistics

QUICK FACTS

W/M is a comparison basis

Compare metric tonnes with cubic metres; the higher number commonly becomes the LCL charging basis.

Revenue Ton is the billing unit

In many LCL tariffs, Revenue Ton is the billable quantity after the W/M rule is applied; it should not be treated as a universally identical label for every use of Freight Ton.

Not every charge uses the same unit

Ocean freight, CFS, handling and local charges may be rated per W/M, shipment, bill of lading, package or separate minimum.

Packed measurements control

Final charges may change when the CFS reweighs or remeasures cargo and applies rounding or minimum-charge rules.

SCOPE OF APPLICATION

This article applies to ocean Less than Container Load (LCL) shipments, mainly ordinary general cargo that can be packed and consolidated with other shippers’ cargo.

It should not be applied mechanically to dangerous goods, reefer cargo, oversized cargo, non-stackable units, loading-metre cargo or lanes using a special density factor. Those cases require written confirmation from the forwarder or NVOCC.

TERMINOLOGY

Term	Meaning	Operational role
W/M – Weight or Measurement	A comparison between cargo weight and volume, commonly metric tonnes versus CBM.	Determines the chargeable quantity for a rate line marked W/M.
Revenue Ton (RT; some tariffs may use FRT/Freight Ton)	The quantity on which freight is assessed; it may be a weight ton or measurement ton as defined by the tariff.	Do not assume RT, FRT and Freight Ton are coded or defined identically by every provider.
CBM – Cubic Meter	External packaged volume calculated from length, width and height.	Represents the space occupied in the container and CFS.
Gross Weight	Cargo weight including packing, pallets and securing materials.	Converted into metric tonnes and compared with CBM.
Minimum Charge	The minimum billable quantity or amount for a charge line or shipment.	May increase the billed amount above the simple W/M calculation.
CFS	Container Freight Station used to consolidate, deconsolidate and handle LCL cargo.	May reweigh and remeasure cargo for final billing.

COMMERCIAL MECHANISM

LCL combines cargo from multiple shippers in one container. Each shipment consumes both payload and space, so the service provider evaluates both.

Under the common ocean-LCL benchmark of 1 CBM = 1,000 kg, preliminary W/M is the higher of cargo volume in CBM and gross weight in metric tonnes. Light, bulky cargo is generally volume-rated; compact, heavy cargo is generally weight-rated. Inland legs or other charge codes may use a different density factor.

Control point: Revenue Ton is not a tax or surcharge. It is a billing unit. Its exact definition, minimum, rounding and charge-code application remain subject to the applicable quotation or tariff.

W/M AND REVENUE TON FORMULA

Step 1 – CBM: Length (m) × Width (m) × Height (m) × number of packages.
Step 2 – Weight Ton: Gross Weight (kg) ÷ 1,000.
Step 3 – Preliminary W/M: Max(CBM, Weight Ton) under the ratio stated in the quotation.
Step 4 – Charge line: determine that line’s own basis, minimum and rounding; amount = billable units for that line × its rate.

Integrated example: five packages, each 1.2 × 0.8 × 0.75 m, total gross weight 1,800 kg. CBM = 3.60; Weight Ton = 1.80; therefore preliminary W/M is 3.60. If the Ocean Freight line alone states a minimum of 4 RT, that line is billed on 4 RT; per-shipment, per-B/L or differently rated lines must be calculated separately.

THREE CHARGING SCENARIOS

Scenario	CBM	Gross weight	Preliminary W/M	Result
Light, bulky cargo	8.40 CBM	1,600 kg = 1.60 t	8.40 RT	Volume controls because CBM is higher.
Heavy, compact cargo	2.20 CBM	4,500 kg = 4.50 t	4.50 RT	Weight controls because tonnes are higher.
Small shipment with minimum	0.65 CBM	420 kg = 0.42 t	0.65 RT; quoted minimum 1 RT	At least 1 RT is billed for that charge line.
Non-stackable cargo	Geometric volume 3.00 CBM	1,100 kg	May be re-rated higher	Confirm deemed height or occupied-space rule.

LCL QUOTATION COMPONENTS

Charge group	Common rating basis	Question to ask
Ocean Freight	Per W/M or Revenue Ton.	Rate, density ratio, minimum and validity.
Origin CFS/Handling	Per W/M, package, shipment or a combination.	Whether weighing, palletising and handling are included.
Destination CFS/Handling	May use W/M with a separate minimum.	Collector, currency, tax and minimum.
Documentation / HBL / D/O	Usually per bill or per shipment.	Do not automatically multiply by Revenue Ton.
Pickup/Delivery	Per truck, distance, weight, CBM or zone.	Not necessarily aligned with ocean W/M.
Special surcharges	DG, non-stackable, oversize, screening or storage.	Trigger condition and billing basis.

DOCUMENTS AND DATA TO CHECK

Document/data	Prepared or issued by	Fields to match
Draft Packing List	Supplier/shipper	Package count, external dimensions, gross weight and packaging type.
Quotation/Tariff	Forwarder or NVOCC	Charge code, unit, minimum, rounding and included/excluded scope.
Booking Confirmation	Booking party	Lane, CFS, cut-off, cargo type and stackability condition.
Warehouse Receipt / Measurement Sheet	CFS or consolidation warehouse	Actual measured volume and weight.
Debit Note/Invoice	Service provider	Rate, RT quantity, exchange rate, tax and extras.
Cargo photographs	Supplier/shipper	Stackability and actual packaged dimensions.

LCL RATING PROCESS BEFORE BOOKING

Standardise package data: use external packed dimensions, gross weight and package count.
Calculate CBM and Weight Ton: total the shipment and retain package-level detail.
Determine preliminary W/M: select the higher quantity using the quotation’s density basis.
Read every charge code: do not multiply all lines by one RT figure where units differ.
Apply minimum and rounding: identify whether they apply per shipment or per charge line.
Build two scenarios: supplier figures and a remeasurement case based on known packaging, pallet or rounding variance; do not add an arbitrary contingency percentage.
Reconcile after CFS receipt: compare the Measurement Sheet with the quotation before accepting the debit note.

Output: a cost sheet showing charge code, unit, RT quantity, minimum, exchange rate and exclusions.

RISKS AND COMMON ERRORS

Error	Impact	Control
Using product dimensions instead of packed dimensions	Understated CBM.	Obtain external carton/pallet dimensions.
Using net instead of gross weight	Packaging and pallet weight omitted.	Use gross weight on the Packing List.
Assuming 1 RT always equals 1 CBM	Heavy cargo is under-rated.	Always compare CBM with metric tonnes.
Multiplying every fee by the same RT	Incorrect scope for per-shipment or per-BL fees.	Read the Unit and Minimum fields for each charge code.
Ignoring non-stackable/oversize status	Higher deemed volume or cargo rejection.	Send photos and dimensions before quotation.
Not checking the CFS measurement	Measurement or data-entry errors may go unnoticed.	Request the Measurement Sheet when variance is material.

OPERATIONAL SOURCES

W/M and Revenue Ton are commercial tariff and quotation rules, not government-fixed fees. Official references:

DHL Global Forwarding – The Cost Drivers of LCL Rates: explains the tonne-versus-CBM W/M method and LCL local charges.
Maersk Shipping Glossary: lists Revenue Ton separately from Weight/Measurement Ton and W/M, reinforcing the need to follow the applicable tariff definition.
Maersk Terms for LCL: illustrates WMU based on gross volume or gross weight, using 1 CBM to 1,000 kg under the published terms.
Kuehne+Nagel Quotation Terms: a Norway-specific example showing that minimums, stackability and deemed-volume rules may be quotation-specific, not a global standard.
Maersk – LCL CBM calculation: confirms volume calculation from cargo dimensions.

FREQUENTLY ASKED QUESTIONS

Are W/M and Revenue Ton the same?

W/M is the selection method; Revenue Ton is the tariff-defined billable quantity. In many LCL quotations RT is derived from W/M after minimum and rounding, but FRT/Freight Ton may be defined or coded differently by the provider.

Does 1 CBM always equal 1 Revenue Ton?

No. Heavy cargo may be rated by metric tonnes, and minimum or special rules may increase the billed quantity.

Will 0.3 CBM be billed at 0.3 times the rate?

Not necessarily. A quotation may impose a minimum RT or minimum monetary charge.

Do I add CBM and tonnes together?

Normally no. Under W/M, the higher converted quantity is selected.

Which figure controls if the CFS measurement is higher?

Final billing often follows the accepted operational measurement under the service terms. Request the Measurement Sheet and challenge abnormal differences.

Are destination local charges always W/M-rated?

No. Some are per W/M, while others are per shipment, bill, package or minimum.

When should LCL be compared with FCL?

When total W/M, minimums, local charges and handling bring LCL close to an FCL quote, or cargo is sensitive to consolidation handling.

APPLICATION NOTE

This article explains rating controls and does not replace a binding quotation. Density ratios, minimums, rounding, stackability conditions, currency and charge codes vary by lane, CFS, forwarder/NVOCC, cargo type and booking date.

When Packing List data differs from CFS measurements, operational evidence should be reviewed before concluding that a charge is incorrect.

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