How is FCL freight calculated? Which is used as the basis for calculation: weight tons or volume tons?

I. The Core Components of FCL Freight

Full Container Load (FCL) freight is not a single, fixed price. Instead, it is composed of a base freight rate and various surcharges. While the charging structure is generally consistent across different routes and shipping companies, the specific amount fluctuates with market conditions.

  1. Base Freight

This is the core component of the freight rate. Shipping companies set a fixed rate based on the route and container type (e.g., 20GP/40GP/40HC), typically quoted in USD/Container. For example, the base freight rate for a 20GP container from Shanghai to Los Angeles might be USD 1,800/Container, a 40GP container USD 3,200/Container, and a 40HC container USD 3,500/Container. Base freight rates are influenced by factors such as route supply and demand, shipping company capacity, and fuel costs. They tend to rise significantly during peak seasons (such as the pre-Christmas season in Europe and the US), while they may decrease during off-seasons.

  1. Surcharges

Surcharges are additional fees charged by shipping companies to cover non-basic costs (such as fuel fluctuations, port fees, and policy adjustments). They are the most volatile component of full container freight rates. Common types include:

Bunker Surcharge (BAF): This fluctuates with international oil prices and is adjusted monthly or quarterly. It is charged based on container type (e.g., $300/container for a 20GP container and $600/container for a 40GP container). It accounts for the largest proportion of surcharges.

Peak Season Surcharge (PSS): This is charged during peak shipping seasons (e.g., August-October) due to space constraints. It is typically 10%-30% of the base freight rate, or a fixed amount (e.g., $200/container for a 20GP container).

Terminal Handling Charge (THC): This refers to the fees incurred by terminals at the port of departure and the port of destination for loading, unloading, and storing containers. This fee is fixed based on the container type (e.g., RMB 800/container for a 20-gbp container at the port of departure, USD 1,500/container for a 40-gbp container at the port of destination; rates vary significantly between ports).

Other surcharges, such as the Currency Devaluation Charge (CAF), charged in response to exchange rate fluctuations, the Port Congestion Charge (PCC), and the Dangerous Goods Charge (DSC), are triggered based on specific circumstances.

The total freight rate for FCL ocean freight can be calculated as follows: Total Freight = Base Freight + Sum of All Surcharges.

  1. Weight Ton vs. Volume Ton: The Core Difference Between Full Container Load (FCL) and Less Than Container Load (LCL)

Weight Ton (W/T) and Measurement Ton (M/T) are the two core rates for ocean freight. However, the applicable logic for FCL and LCL shipping is completely different. In FCL shipping, these two metrics are primarily used to determine whether the cargo meets the container loading requirements, rather than being directly used as the basis for freight calculation. In LCL shipping, the freight rate is determined by the larger of weight ton or measurement ton.

  1. Definition of Weight Ton and Measurement Ton

Weight Ton: The unit of calculation is the actual gross weight of the cargo (cargo weight + packaging weight). 1 weight ton = 1 metric ton (1000 kilograms, or 1 metric ton).

Volume ton: Calculated based on the volume of cargo. In international shipping, the standard of “1 cubic meter (CBM) = 1 volume ton” is generally used (some regions also use “40 cubic feet = 1 volume ton,” but 1 CBM ≈ 35.315 cubic feet, so the actual difference is negligible).

For example: If a shipment has a gross weight of 20 tons and a volume of 15 cubic meters, the weight ton is 20W/T and the volume ton is 15M/T. If the shipment has a gross weight of 12 tons and a volume of 25 cubic meters, the weight ton is 12W/T and the volume ton is 25M/T.

  1. Full Container Load (FCL) Ocean Freight: The “Limiting Effect” of Weight and Volume Tons

FCL ocean freight is charged per container (e.g., a fixed price for 20gp/40gp). However, there are strict upper limits on container weight and volume. Weight and volume tonnage must meet these limits; otherwise, additional fees may apply or the shipping company may refuse carriage. Taking common container types as an example, standard loading limits are as follows:

20GP (20-foot general purpose container): Volume approximately 33 cubic meters, maximum load capacity approximately 22-25 tons (this varies slightly between shipping lines and routes. For example, US routes typically limit cargo to no more than 22 tons due to port weight restrictions);

40GP (40-foot general purpose container): Volume approximately 67 cubic meters, maximum load capacity approximately 26-28 tons;

40HC (40-foot high cube container): Volume approximately 76 cubic meters, maximum load capacity similar to the 40GP (approximately 26-28 tons, due to the increased height but unchanged load-bearing structure).

In practice, shippers must ensure that their cargo’s “weight tons ≤ container load limit” and “volume tons ≤ container capacity limit” are within the following limits:

If the weight exceeds the limit (e.g., a 20-gp cargo with a gross weight of 28 tons exceeds the 25-ton limit), the shipping company will charge an “overweight surcharge” (usually $50-200 per ton overweight) or refuse loading due to the vessel’s weight capacity.

If the volume exceeds the limit (e.g., a 20-gp cargo with a volume of 35 cubic meters exceeds the 33 cubic meter limit), the cargo cannot be fully loaded into the container and must be split or replaced with a larger container (e.g., a 40-gp container), indirectly increasing freight costs.

Therefore, in FCL ocean shipping, weight tons and volume tons are used as “loading compliance criteria” rather than freight calculation criteria. As long as the cargo is within the container load and capacity limits, the base freight rate and surcharge for the same container type remain fixed regardless of changes in weight tons and volume tons.

  1. LCL Ocean Freight: The “Greater of Weight Tons and Volume Tons” Logic

Unlike FCL, LCL cargo consists of goods from multiple shippers sharing a single container. Shipping companies or freight forwarders charge freight based on the space occupied by the cargo. In this case, the “greater of weight tons and volume tons” method is used:

First, calculate the cargo’s weight tons (W) and volume tons (M).

Compare W and M, and take the larger value as the “Revenue Ton” (Revenue Ton, R/T).

Freight is calculated as “Revenue Ton × LCL Rate.”

For example, the LCL rate from Shanghai to Hamburg is $80 per chargeable ton. A shipment with a gross weight of 10 tons (10W/T) and a volume of 15 cubic meters (15M/T) would have a chargeable ton of 15M/T, resulting in a freight rate of $1,200. If another shipment with a gross weight of 20 tons (20W/T) and a volume of 12 cubic meters (12M/T) were to have a chargeable ton of 20W/T, resulting in a freight rate of $20,000 per ton.

The core logic of this rule is that heavy cargo occupies more of a vessel’s load-bearing resources, while bulky cargo (larger in size and lighter in weight) occupies more of a vessel’s volumetric resources. Therefore, both shipments should be charged based on the “more resource-intensive dimension” to ensure that transportation costs align with resource usage.

  1. Practical Considerations for Calculating Full Container Load (FCL) Freight Rates

Clearly distinguish between “all-inclusive” and “itemized” rates: Freight forwarders may only quote “basic freight” and conceal surcharges (such as THC and BAF). Ask them to provide a “full cost breakdown” to avoid being forced to pay additional fees later.

Calculate the cargo’s “weight-to-bulk ratio” in advance: For FCL shipments, first calculate the “volume/weight ratio” (i.e., the volume per kilogram of cargo) to determine whether the cargo is “heavy” (e.g., metal products, volume/weight < 0.001 CBM/kg) or “bulky” (e.g., textiles, volume/weight > 0.003 CBM/kg). Then, match the appropriate container type—for heavy cargo, prioritize the “load limit,” while for bulk cargo, prioritize the “volume limit” to avoid wasting resources.

Beware of “hidden overweight charges”: Some routes (such as the US and Canada) have restrictions on the gross container weight (cargo weight + container weight). (For example, the US highway weight limit is 36 tons, and a 20GP container weighs approximately 2.5 tons, so the gross weight must be ≤ 33.5 tons.) Even if you do not exceed the shipping company’s maximum weight, additional charges may apply due to the destination port’s highway weight restrictions. Please confirm this with your freight forwarder in advance.

Peak season surcharges require real-time confirmation: During peak season, surcharges such as PSS and BAF may adjust weekly. Before booking, please ask your freight forwarder for the latest surcharge information to avoid cost overruns due to outdated quotes.

(Note: All fees listed above are for reference only. Please refer to your actual invoice for details. Thank you!)

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