By the Waymore Shipping Operations Team | Last updated: September 12, 2026 | 12 min read

Fuel Surcharges (BAF) & Currency: Why Your Freight Rate Changes

BAF — the Bunker Adjustment Factor — is a surcharge carriers add to freight rates to recover fuel costs, and it is the main reason your China shipping quote changes month to month even when the base rate looks unchanged. Together with currency surcharges (CAF) and seasonal add-ons, fuel-related charges typically make up 10–25% of a long-haul freight invoice, and each line moves on its own schedule.

If you have ever compared this month's quote to last month's and found three new acronyms and a different total, this article is for you. We will break down a real-style China export quote line by line, explain what drives each surcharge, and show you how to compare quotes without getting fooled by a low base rate hiding fat surcharges.

What Is the BAF Fuel Surcharge, Exactly?

Container ships burn enormous quantities of bunker fuel — historically heavy fuel oil, now mostly very-low-sulfur fuel oil (VLSFO) under IMO 2020 sulfur rules. Fuel is typically a carrier's largest variable cost, historically in the range of 10–30% of total operating cost depending on the fuel price cycle and how fast vessels steam. When bunker prices move, carriers cannot re-print their annual contract rates, so they adjust through a surcharge: the Bunker Adjustment Factor.

How it appears on your quote varies by carrier and trade lane:

• Fixed dollar per container: the most common form on trades from China — e.g. $250 per 40HC Shanghai to Los Angeles. Carriers like Maersk publish their current surcharge levels and local charge schedules on their websites (maersk.com), so any forwarder's BAF line can be verified.
• Percentage of freight: some LCL and smaller trades apply BAF as 10–20% of the ocean rate, which scales the surcharge with the base rate.
• Bundled into an all-in rate: many NVOCCs and forwarders (including us) absorb the surcharge into one all-in number — more on why that matters below.

BAF also has a cousin born from environmental regulation: the low-sulfur surcharge (LSS), introduced when IMO 2020 forced the switch from cheap heavy fuel oil to VLSFO costing roughly 50% more. Unlike BAF, LSS tends to be sticky — it was introduced as a structural cost and has largely stayed, which is worth remembering when comparing "all-in" rates that mysteriously omit it.

What Else Is Hiding in Your Rate? The Full Surcharge Family

Fuel is the headline act, but a modern China export quote can carry a dozen adjustable lines. The ones you will actually meet:

Two of these deserve special attention because they distort comparisons. First, CAF sounds trivial at 1–4%, but on a $4,000 rate that is $40–$160 per container, and it compounds the confusion when two quotes were generated in different months. Second, PSS is the most abused surcharge in the industry: introduced "temporarily" in peak season, it has historically lingered for quarters after demand normalized. Analysts who track carrier revenue — see for example the quarterly reporting covered by S&P Global Market Intelligence — have repeatedly noted how surcharge lines cushion carrier earnings when base rates soften.

Anatomy of a Real Quote: Where the Money Goes

Here is a representative all-in quote structure for a 40HC from Shanghai to Los Angeles, in the format we and other transparent forwarders present (numbers illustrative of a typical autumn week):

Note the punchline: surcharge lines add $948 — nearly a quarter of the invoice — on top of the base rate. This is exactly how the "cheap quote" trick works: one forwarder quotes the $2,650 base and quietly adds surcharges later; another quotes $3,908 all-in and looks 32% more expensive on paper. The industry's rate indexes — the Drewry World Container Index and the Shanghai Shipping Exchange's SCFI — publish composite all-in assessments precisely so shippers can compare like with like across ports and carriers. Learning to read them (we have a plain-English walkthrough of the SCFI) turns surcharge confusion into a five-minute check.

Why Does the Currency Surcharge Matter for China Shippers?

Ocean freight is priced globally in US dollars, but carriers pay crews, port fees, agency costs and inland charges in local currencies. When those currencies strengthen against the dollar, carriers' dollar-denominated revenue buys less of their cost base — CAF compensates. For China-origin cargo the effect is usually modest, but two currency-related realities matter to importers:

• Your local-currency freight cost swings twice. If you pay in euros or sterling, you absorb both the freight market's movements and the USD/EUR or USD/GBP rate. A 3% freight increase can become a 6% increase in your currency.
• Renminbi-linked charges at origin. Trucking, warehousing and some origin handling in China are priced in RMB; when forwarders convert to USD for invoicing, the conversion rate they use can vary — one more reason quoted totals drift.

The practical defense is the same as for fuel: fixed, written validity. A rate with a stated validity period and an all-in structure converts currency noise from your problem into your forwarder's problem.

How to Protect Yourself: 5 Practical Rules

1. Demand all-in quotes with a validity date. "Valid 14 days, all-in to door/ port" is a reasonable ask. If a forwarder refuses to state validity, that refusal is information.
2. Normalize every quote to all-in before comparing. Ask specifically: "Does this include BAF, LSS, CAF, PSS, THC and documentation?" The question alone filters out half the market's bad actors. Our guide to hidden fees in freight quotes lists the full interrogation checklist.
3. Ask which surcharges are contractually capped. On ongoing volumes, we cap or absorb PSS and CGS for regular clients — the surcharge that cannot appear is the one you never dispute.
4. Watch the indexes monthly, not daily. BAF and CAF move on monthly-ish cycles; reacting to daily spot noise leads to over-hedging. A monthly review against Drewry or SCFI composites is enough signal for most importers.
5. Understand where discounts actually come from. Surcharges are largely pass-through; the genuine savings live in the base rate, which depends on the space a forwarder controls. That is why our weekly discounted rates page exists — secured space bought well gets passed through, rather than padding the surcharge lines.

One closing reframe: surcharges are not going away. They are how an industry with volatile input costs keeps long-term contracts usable. The importers who lose money on freight are not the ones who pay BAF — everyone pays BAF — but the ones who compare quotes without knowing what is inside them. Ten minutes of line-item literacy, once, protects every quote you will ever receive.

Frequently Asked Questions

What is the BAF fuel surcharge in shipping?

BAF (Bunker Adjustment Factor) is a surcharge carriers add to base ocean freight to recover the cost of bunker fuel, the heavy fuel oil that powers container ships. When fuel prices rise, BAF rises; when they fall, BAF follows with a lag of several weeks. It is typically quoted as a dollar amount per container (for example $180–$500 per 40HC on long-haul trades) or, on some LCL trades, as a percentage of the freight rate.

Why does my freight quote change even when the base rate stays the same?

Because a freight rate is a bundle of components, not one number. The base ocean rate may hold while the surcharges move: BAF tracks fuel prices, CAF tracks currency exchange, and seasonal or congestion surcharges appear and disappear with market conditions. A quote that was valid last month can drift 5–15% this month on surcharges alone, even with the base rate unchanged.

What is the CAF currency adjustment factor?

CAF is a surcharge (or discount) that compensates carriers for exchange-rate movements, because ocean freight is priced in US dollars while much of a carrier's cost base — crew, port charges, local handling — is paid in other currencies. CAF is usually a small percentage of the freight rate, often 1–4%, and changes monthly or quarterly with currency movements.

How much of my ocean freight cost is actually fuel?

Fuel is typically the largest single variable cost in container shipping — historically on the order of 10–30% of a carrier's total operating cost depending on the fuel price cycle and vessel speed. For the shipper, surcharges tied to fuel and other variables usually represent 10–25% of the total freight invoice on long-haul trades, which is why tracking them separately matters.

Can I get an all-in freight rate that includes all surcharges?

Yes. Good forwarders quote all-in rates that bundle base freight, BAF, CAF and standard origin charges into one number, with validity periods stated in writing (commonly 7–30 days). This does not freeze the market — a major fuel spike or a new war-risk surcharge can still change things — but it removes the per-line-item guessing game and makes quotes comparable between forwarders.

Do fuel surcharges apply to air freight too?

Yes. Air freight quotes carry a fuel surcharge (FSC) plus a security surcharge, quoted per kilogram and adjusted roughly monthly by airlines based on jet fuel prices. Air fuel surcharges are typically 15–30% of the air rate on major lanes, so the same monthly-review habit that applies to ocean surcharges applies to air as well.