LCL ocean freight often uses a weight/measure (W/M) rating concept. Instead of charging only by cubic meters, the forwarder compares cargo volume with a weight-equivalent measure and bills the larger revenue quantity, subject to the quote’s tariff and minimums.
A common planning convention is 1 revenue ton = 1 cubic meter or 1 metric tonne, whichever produces the larger number. This convention is useful for estimates, but the actual forwarder quote controls the conversion basis, minimum charge and local fees.
What is a revenue ton?
A revenue ton is a billing unit, not necessarily a physical tonne. Under a common W/M convention:
Revenue tons = max(CBM, gross weight in metric tonnes)
If a shipment is 3.6 CBM and weighs 1.8 metric tonnes, the volume measure is larger, so the planning revenue quantity is 3.6 RT. If another shipment is 1.4 CBM but weighs 2.2 tonnes, weight is larger, so the planning quantity is 2.2 RT.
Worked example
| Shipment | CBM | Weight (tonnes) | Planning revenue tons |
|---|---|---|---|
| A | 4.2 | 1.3 | 4.2 |
| B | 2.0 | 2.8 | 2.8 |
| C | 6.0 | 6.0 | 6.0 |
If the ocean freight rate were $85 per revenue ton, Shipment A’s planning base ocean charge would be 4.2 × $85 = $357 before minimums, origin/destination charges and other fees.
Why LCL quotes differ
Two forwarders can quote the same W/M rate but produce different all-in totals because LCL has many additional components:
- origin CFS handling,
- documentation,
- ocean freight,
- destination CFS charges,
- customs/brokerage,
- delivery or drayage,
- minimum billable quantities.
That is why the LCL Chargeable Volume Calculator should be used as a planning aid, not a replacement for the forwarder’s tariff.
Density determines whether weight wins
Under a 1 CBM : 1 tonne convention, cargo denser than 1,000 kg/m³ tends to become weight-driven. Lower-density cargo tends to be volume-driven. Packaging optimization can therefore lower the revenue quantity for bulky cargo until weight becomes the controlling measure.
Use the CBM Calculator to measure shipment volume and compare scenarios before booking.
Minimum charges matter
A small LCL shipment may be subject to a minimum number of revenue tons or minimum charge. If the tariff minimum is 1 RT, a 0.45-CBM lightweight shipment can still be billed at the minimum. Always ask the forwarder to state the minimum explicitly.
W/M is not the same as air-freight volumetric weight
Both concepts compare weight and space, but the conversion factors and modes are different. Air freight commonly uses a volumetric-weight formula; LCL ocean freight often uses W/M revenue units. Do not transfer one formula into the other.
For modal context, see LCL vs FCL Shipping.
Frequently asked questions
Is 1 CBM always equal to 1 revenue ton?
No. It is a common LCL convention, but tariffs and trade lanes can use different rules. Verify the quote.
What if weight and CBM are equal?
The revenue quantity is the same under the common convention.
Does the W/M rate include destination fees?
Not necessarily. Ask for an all-in breakdown rather than assuming the ocean W/M line covers the full door cost.
Sources
PackToolbox guides are built around stated formulas, practical examples and source checks for changeable carrier, freight and logistics rules. Calculators are planning aids; final requirements should be verified with the relevant carrier or service provider.