Compare costs before you ship
Convert carton dimensions to cubic meters and compare volumetric CBM with weight tons for an illustrative less-than-containerload (LCL) freight quote.
| Carton volume total | — |
| Weight in metric tons | — |
| Billable weight/measure units | — |
| LCL base freight | — |
| Entered handling fees | — |
| Total illustrative freight | — |
CBM formula for freight shipping
For dimensions in centimeters, CBM = length × width × height × carton count ÷ 1,000,000. A carton measuring 60 × 50 × 40 cm occupies 0.12 cubic meters. Twenty identical cartons occupy 2.4 CBM before additional pallets or packaging.
What does W/M mean in LCL freight?
Weight/measure pricing commonly compares cubic meters with metric tons of cargo, then charges for the larger revenue unit, subject to the carrier’s minimum or rounding rules. For 20 cartons weighing 25 kg each, gross weight is 500 kg, or 0.5 metric tons. In the example above, 2.4 CBM exceeds 0.5 tons. At $85 per W/M unit, base freight is $204. Adding a separately quoted $130 in handling gives $334 total.
Additional costs to plan for
Real LCL quotations can involve CFS receiving, documentation, origin terminal handling, destination handling, customs brokerage, pickup, insurance, duties and taxes. Freight forwarders may charge minimum volume, palletized dimensions or a freight-density conversion different from this example. These should be obtained in writing. For air and express services, see the volumetric-weight calculator; for customs value, see the CIF calculator.
Guide reviewed November 14, 2026. The examples below explain each input, underlying assumptions, and important commercial limitations.
CBM is a measurement of space, not weight
A cubic meter is a unit of volume equal to a cube measuring one meter by one meter by one meter. Freight businesses use CBM to plan container space, consolidation, warehouse capacity and loading arrangements. CBM alone does not tell you what a shipment weighs or how many cartons will fit safely.
If dimensions are in centimeters, multiply length, width and height and divide by one million. Multiply by the number of identical cartons for the shipment total. A single box measuring 60 × 50 × 40 cm occupies 0.12 CBM, so twenty boxes occupy 2.4 CBM before accounting for pallet overhang, packing restrictions, or unusable gaps.
How W/M works for less-than-containerload freight
LCL stands for less than containerload: cargo from multiple shippers shares a container. Many LCL quotes use weight/measure or revenue ton units. The carrier may compare the cargo’s cubic meters with its gross mass in metric tons and charge for the larger, subject to contract minimums and rounding increments.
For the default example, twenty 25 kg cartons weigh 500 kg in total, or 0.5 metric tons. The shipment measures 2.4 CBM, so the larger of the two values is 2.4 W/M units if that is how the quote is written. At $85 per W/M unit, the basic line-haul estimate is $204. If separately quoted terminal and documentation fees total $130, the displayed modeled freight becomes $334.
Carton measurements, pallets, and irregular cargo
Measure finished outside dimensions, not the nominal product package. If a pallet is wrapped, the carrier may calculate volume from the palletized outside length, width and height. Pallet space may be greater than the sum of the individual boxes because gaps, overhang and a pallet base occupy room.
A shipment of differently sized boxes should be calculated by group and totaled, rather than using the dimensions of one carton for every unit. For long or non-stackable machinery, a carrier may impose a measurement rule or minimum charge beyond a simple cube. Request the forwarder’s measurement sheet if the quote seems unusually high.
LCL versus FCL: how to compare quotes
Full containerload, or FCL, typically has a different cost structure from LCL. An FCL quotation covers a specified container movement, while LCL may involve origin handling, consolidation, destination deconsolidation, local delivery and minimum charges. The cheapest choice cannot be determined from volume alone.
If you are approaching a sizeable fraction of a container’s usable capacity, compare written door-to-door LCL and FCL quotes using the same route, transit time and delivery point. Consider cargo security, port delays, detention/demurrage risk, and container utilization. A 20-foot container’s nominal volume is not a promise that all of it is safely usable by your specific cargo.
What freight cost is excluded from the calculator?
This tool includes a simple W/M line-haul estimate and one user-entered fee amount. It does not automatically estimate fuel and security surcharges, origin inland haulage, warehouse receiving, customs duty, import VAT, cargo insurance, port storage, customs bonds, chassis rental, documentation fees, or the final destination delivery.
The quotation currency is not converted automatically. If a forwarder invoices part of the cost in local currency, convert those amounts consistently and document the applied exchange rate. For import-cost planning beyond freight, combine the quote with the global landed cost calculator and CIF calculator.
Practical checklist before booking
Confirm the number of packages, outside dimensions, verified gross weight, total CBM, pallet count, stackability, packaging class, dangerous goods status, and load port/destination port. Ask whether the quoted rate is per CBM, per metric ton, or per W/M, and whether fractional units are rounded to the next full unit.
Request a quote including CFS charges, customs documentation, pickup and delivery, free-storage time and destination handling. Compare offers on the same Incoterm and delivery basis. Keep the actual invoice for improving future forecasts instead of relying indefinitely on an estimated rate.
Frequently asked questions
How many cubic meters are in a 100 × 100 × 100 cm box?
Exactly 1 CBM, because 100 cm equals one meter on each of the three sides.
Is CBM the same as a chargeable freight ton?
Not always. CBM is volume; W/M pricing may compare volume with mass and use whichever creates the greater charge.
Do I include the pallet height?
Include the pallet and wrapping where the forwarder measures the palletized load. Follow the billing terms in the actual quotation.
Does LCL always cost less than FCL?
No. Destination charges, minimums, delivery fees and total volume can make FCL competitive even before a container is filled.
Can this calculate volumetric weight for express courier?
Use our dedicated volumetric-weight calculator. Courier divisor billing and LCL W/M billing are different models.
Sources and related calculators
Important limitations
These figures are estimates and do not represent a government tariff determination or a binding freight quotation. See our calculation methodology and disclaimer.