How to Calculate Freight Shipping Costs

Freight quotes are dense by design. A single line on a rate sheet — "All-in: $1,950" — is almost never the whole invoice, and forwarders who quote that way are either rolling up charges (fine) or hiding them (not fine). If you want to compare two quotes honestly, you need to understand the full cost structure. Here's a clean breakdown.

The components of freight cost

A complete landed cost has six layers:

1. Freight — the base transport cost on the dominant leg (ocean, air, or road).
2. Surcharges — fuel, security, currency and congestion adjustments, usually expressed as percentages or per-unit add-ons.
3. Terminal and handling — THC at origin and destination ports, warehouse handling, CFS fees for LCL.
4. Documentation and customs — export declaration at origin, import declaration at destination, broker fees, certificates.
5. Duties, taxes and VAT — government charges on the customs value.
6. Inland and last-mile — trucking from port to final destination, delivery scheduling, any redelivery attempts.

Skip any of these from your comparison and you'll pick the wrong forwarder.

The two things that determine chargeable weight

Carriers don't bill by actual weight — they bill by the higher of actual weight and volumetric weight, which monetises the space your cargo occupies in a low-density container or plane hold.

Air freight uses a divisor of 6,000: volumetric kg = length × width × height (cm) ÷ 6,000. A 120×80×100 cm carton weighing 200 kg has a volumetric weight of (120·80·100)/6,000 = 160 kg — so you pay for 200 kg (the higher number). A carton of the same dimensions weighing only 60 kg? You pay for 160 kg.

Sea LCL uses weight-or-measure (w/m): 1 CBM = 1,000 kg equivalence. A 2 CBM / 1,800 kg shipment bills as 2 w/m; a 2 CBM / 2,200 kg shipment bills as 2.2 w/m.

Both are designed so that empty-ish cargo pays its fair share of the container or ULD.

A worked example: Dhaka → Antwerp, 180 kg / 0.9 CBM express air

Let's walk through a real-ish quote. Indicative Q1 2026 express air rates DAC → BRU:

• Volumetric weight = (90 × 80 × 125) / 6,000 ≈ 150 kg. Actual 180 kg wins → chargeable weight 180 kg.
• Air freight rate: $4.40/kg → $792.
• Fuel surcharge: 18% of freight → $143.
• Security surcharge: $0.18/kg → $32.
• Origin handling (pickup, X-ray, AWB at HSIA): $95 flat.
• Export declaration Bangladesh (EXP-form + ASYCUDA entry): $55.
• Destination THC Brussels: $85.
• Import declaration Belgium: $90.
• Last-mile delivery to Antwerp warehouse: $110.

Subtotal before duties: $1,402.

Now the government layer. Suppose the cargo is finished cotton knitwear with HS 6109.10, customs value $15,000, Incoterm DAP Antwerp. Bangladesh-origin knitwear qualifies for EU EBA duty-free treatment with a valid REX statement → $0 duty. Without the preference the MFN rate of 12% would apply ($1,800) — which is exactly why the origin paperwork is non-negotiable on this lane. Belgian import VAT is 21% on (customs value + duty + freight up to first EU entry point) — roughly 21% × $15,000 = $3,150. Your Belgian importer can defer this under ET14000 so it's a cashflow item, not a cost.

Landed cost total: $1,402 + $0 + $3,150 = $4,552 on top of the $15,000 goods value — vs the $6,352 you would pay without the REX statement. One piece of paper, $1,800 difference.

Now compare that to a sea option on the same consignment: LCL at $95/CBM + $165 + $145 = $396 freight side, add ~40-day transit. Both are correct answers. Only you can decide which price you're paying for — cost or time.

The surcharges that move

Freight rates move, but the surcharges move more. Watch three:

• Bunker Adjustment Factor (BAF) on sea freight tracks fuel prices. In 2022 it spiked to north of $1,200 per 40' HC; in early 2026 it's running ~$380. Your quote from six months ago is almost certainly wrong today.
• Currency Adjustment Factor (CAF) adjusts for USD volatility on non-USD lanes. On Europe-Asia it's small (1–3%); on Europe-Latin America it can swing 8–12%.
• Peak Season Surcharge (PSS) is exactly what it sounds like — ocean carriers add $200–$600 per container on hot lanes during August-October transpacific peak and before Chinese New Year. If your quote straddles these windows, confirm the surcharge is locked.

The "all-in" trap

When a forwarder quotes "all-in to Antwerp" (or Hamburg, or Jebel Ali, or New York), check the scope carefully. Some mean "to port of discharge including THC" (so you pay import declaration, VAT and delivery). Some mean "DDP to your door." The numbers look similar; the scope can differ by 30% of the total invoice.

The honest comparison format is: for the same Incoterm, the same chargeable units, the same surcharge treatment, and the same inclusion/exclusion of duties and VAT, what's the total? A forwarder who won't give you that breakdown is either lazy or hiding the line you'd object to.

The one rule worth remembering

If you measure your freight spend monthly, the number that matters isn't the freight rate — it's the landed cost per unit moved. The freight rate alone tells you which bid was lowest on one leg; landed cost tells you who actually delivered value. Track the second one.