Sea Freight vs Air Freight vs Courier
Choosing a shipping method from China is a balance between cost, speed, shipment size and reliability. Sea freight is generally the economical choice for larger commercial shipments. Transit can take several weeks, and port schedules, consolidation and customs handling add variability, but the cost per unit often falls as volume increases. Less-than-container-load service allows several importers to share a container, while full-container-load service gives one shipper the container.
Air freight is faster and can protect cash flow when inventory is urgently needed, yet it costs much more per chargeable kilogram. It is often useful for moderate-size, higher-value or time-sensitive goods. Express courier services such as DHL, UPS and FedEx are convenient for samples and small consignments because collection, transport and customs presentation are packaged into a more integrated service. Courier rates can become expensive quickly when cartons are heavy or bulky.
The cheapest line on a quote is not automatically the cheapest delivered option. Compare pickup, export handling, main transport, fuel or security surcharges, customs clearance, destination handling and final delivery. Also consider the cost of delay: a faster shipment may be justified if it prevents a stockout, while a slow method may be perfectly suitable for replenishment planned months ahead.
How Freight Quotes Use Weight and Volume
Freight providers rarely charge from scale weight alone. They compare actual gross weight with the space the shipment occupies. For LCL sea freight, the common W/M convention compares metric tons with cubic meters. A 2 CBM shipment weighing 500 kg has a volume measure of 2 and a weight measure of 0.5 metric tons, so 2 W/M is the likely base billing quantity. Minimum charges still apply, and local fees may be quoted per shipment rather than per CBM.
Air freight uses volumetric weight. A common planning conversion is 167 kilograms per CBM, although the exact factor and rounding rule depend on the carrier. Express couriers often use an even higher volumetric conversion, around 200 kilograms per CBM. The calculator compares actual weight with these volume conversions and uses the larger number. It then applies transparent sample rates so you can compare directionally; it is not a live carrier quotation.
Accurate inputs matter. Use gross weight rather than net product weight, and calculate volume from final packed cartons with the CBM Calculator. Ask the supplier whether carton measurements are estimates or confirmed production dimensions. A packaging change can alter chargeable weight even when product quantity stays the same.
Incoterms Basics for Importers
Incoterms define where delivery responsibility, cost and risk transfer between seller and buyer. Under EXW, the buyer takes responsibility from the seller’s premises, so factory pickup and export procedures may be on the buyer. Under FOB for sea shipments, the seller generally handles delivery aboard the vessel at the named port, while the buyer arranges main freight and subsequent costs. Under CIF, the seller arranges ocean freight and insurance to the named destination port, but that does not mean all destination charges are included.
DDP places extensive delivery responsibility on the seller, often to the named destination, but importers should verify who acts as importer of record, how duty is declared and whether the arrangement complies with destination rules. A low DDP quote can hide assumptions that are difficult to audit. Whatever term you choose, write the named place and Incoterms edition on the purchase order and ask for an itemized scope.
How to Use This Estimate
Start with one realistic shipment, then test alternatives. Compare the original order with a smaller air shipment, or split urgent inventory by air while sending the balance by sea. The difference reveals the price of speed. Request formal quotes using the same weight, CBM, origin, destination, cargo description and Incoterm so the comparisons are meaningful.
After selecting a planning estimate, add it to the China Import Cost Calculator with product value, duty, insurance, brokerage and inland transport. Freight cost alone is not landed cost, and the lowest freight mode may not produce the best overall inventory decision.
Frequently Asked Questions
Is sea freight always cheaper than air freight?
Sea freight is usually cheaper for larger shipments, but minimum charges and destination fees can make it less attractive for very small consignments. Compare complete door-to-door quotes.
What is chargeable weight?
Chargeable weight is the billing quantity after comparing actual weight with a carrier’s volumetric conversion. The carrier normally charges whichever basis produces the higher amount.
What does W/M mean on a freight quote?
W/M means weight or measure. For LCL sea freight, one metric ton is commonly compared with one cubic meter, and the larger revenue measure is used for the base rate.
Are customs duty and taxes included in these estimates?
No. The estimates compare transport modes only. Duty, VAT or GST, brokerage, insurance, terminal fees and inland delivery may need to be added separately.
Which Incoterm is best for importing from China?
There is no universal best term. FOB can provide useful control over main freight, while EXW creates more origin responsibility and DDP shifts more logistics responsibility to the seller. Confirm exactly what each quote includes.