Bunker fuel is the general term for fuel oil used to power ocean-going ships and vessels. The name derives from the storage bunkers (tanks) on ships where fuel is held. Historically, bunker fuel referred primarily to heavy fuel oil (HFO), a residual product from crude oil refining that is thick, viscous, and cheap but highly polluting. Since 2020, IMO regulations have transformed the marine fuel mix: most large vessels now burn Very Low Sulphur Fuel Oil (VLSFO, max 0.5% sulphur) or Marine Gas Oil (MGO, max 0.1% sulphur) unless equipped with scrubbers that allow continued use of cheaper High Sulphur Fuel Oil (HSFO). Bunker fuel represents the single largest operating cost for most container shipping and bulk carrier companies.

What is VLSFO and how does it differ from MGO?

VLSFO (Very Low Sulphur Fuel Oil) is a marine fuel blend with a maximum sulphur content of 0.5%, compliant with the IMO 2020 global sulphur cap. It is a blended product — typically combining vacuum gasoil, distillates, and low-sulphur residual components — and is considerably cheaper than MGO while still meeting open-ocean sulphur regulations. MGO (Marine Gas Oil) is a distillate fuel (similar in composition to diesel/gasoil) with max 0.1% sulphur, required in Emission Control Areas (ECAs) such as the North Sea, Baltic Sea, English Channel, and North American coastal zones. MGO is more expensive than VLSFO — typically $50–150/tonne higher — but burns more cleanly and is mandatory near coasts and in ports. HSFO (High Sulphur Fuel Oil, >3.5% sulphur) is still used by vessels fitted with exhaust gas cleaning systems (scrubbers) that remove sulphur oxides before emission.

How do bunker prices affect consumer goods prices?

Marine fuel costs are a significant component of international freight rates, which in turn affect the landed cost of imported goods. Approximately 90% of world trade by volume is carried by sea. When VLSFO bunker prices rise $100/tonne, freight rates on major container routes typically increase by $100–300 per forty-foot equivalent unit (FEU), depending on vessel size and route length. For a container of consumer electronics (say, $50,000 value in 500 units), a $200/FEU freight increase represents approximately $0.40 per unit — a modest direct impact. However, fuel surcharges applied by shipping lines (BAF — Bunker Adjustment Factor, or FAF — Fuel Adjustment Factor) can be more volatile than raw commodity costs, and prolonged high bunker prices contribute to structurally higher freight rates that filter through to retail prices, particularly for bulky or low-value commodities like furniture, appliances, and food.

Marine Fuel & Bunker Costs Guide

Published 1 July 2026 · Updated 19 October 2026

Marine fuel — called bunker fuel in the shipping industry — is the largest single operating expense for ocean-going vessels, typically accounting for 40–60% of total voyage costs. Unlike road transport fuels, marine fuels are traded in a specialised global market with major bunkering hubs in Singapore, Rotterdam, Fujairah (UAE), Houston, and Zhoushan (China). Understanding marine fuel grades, pricing, and regulation is essential for anyone tracking global trade costs, freight rates, or the shipping industry's contribution to fuel demand.

For context on crude oil pricing, which underpins marine fuel costs, see our Brent crude glossary entry and our crude oil benchmarks guide. For comparison with road transport fuel costs, see our trucking fuel costs guide.

Marine fuel grades explained

Grade	Sulphur content	Typical use	Approx. price vs Brent
HSFO (High Sulphur FO)	>3.5% S	Scrubber-fitted vessels only	Brent − $30–50/bbl (~$200–350/t)
VLSFO (Very Low Sulphur FO)	<0.5% S	Standard open-ocean compliance	Brent − $10–20/bbl (~$350–550/t)
MGO (Marine Gas Oil)	<0.1% S	ECA zones, port approach	Brent + $5–15/bbl (~$450–650/t)
LNG (Liquefied Natural Gas)	Near-zero S	Dual-fuel newbuilds; LNG-powered vessels	Varies; linked to JKM/TTF/Henry Hub
Methanol	Zero S	Newer dual-fuel vessels (Maersk, CMA CGM)	Higher than HFO; green methanol premium

VLSFO became the standard marine fuel globally from January 2020 following the IMO 2020 regulation. Before 2020, most vessels burned HSFO — a cheap residual product — without restriction on the open ocean. The switch to VLSFO significantly raised average bunker costs but improved air quality near shipping lanes and ports.

For context on oil tanker types that transport crude and fuel oil to bunkering hubs, see our oil tanker glossary entry.

IMO 2020: the sulphur cap that changed marine fuels

The International Maritime Organization's (IMO) global sulphur cap — effective 1 January 2020 — reduced the maximum permitted sulphur content of marine fuel from 3.5% to 0.5% for vessels operating outside Emission Control Areas (ECAs). Inside ECAs (North Sea, Baltic, English Channel, North American coast, US Caribbean), the limit is 0.1%, met only by MGO or LNG.

The regulation had three options for compliance:

Switch to VLSFO — the simplest path; most vessels adopted this
Install exhaust gas cleaning systems (scrubbers) — allows continued HSFO use; high upfront cost ($2–5m) but lower ongoing fuel cost if the HSFO–VLSFO spread justifies it
Convert to LNG or alternative fuels — primarily for newbuilds given the capital cost involved

IMO 2020's market impact
The transition to VLSFO was initially expected to cause a major disruption to refinery product balances — with high distillate demand to produce VLSFO blends and lower residual demand for HSFO. In the event, the refining industry adapted faster than feared. The VLSFO–HSFO spread widened to $150–250/tonne in 2020–2021 before stabilising at $100–150/tonne in 2024–2026, making the economics of scrubber installation more borderline than initially anticipated for most vessel types.

What drives bunker fuel prices?

Bunker prices are primarily a function of crude oil prices, with refining margins for the specific product grade applied on top:

Crude oil price (Brent/Dubai) — forms the base cost. VLSFO bunker prices in Singapore typically track ~85–90% of the Brent crude price on a $/tonne basis
Refinery complexity and product balance — VLSFO blending requires vacuum gasoil and distillate components; MGO is a straight distillate cut; both are affected by refinery utilisation and product demand globally
Hub-specific supply and demand — Singapore, Rotterdam, and Fujairah each have their own supply-demand balance affecting local prices; Singapore VLSFO typically sets the global benchmark
Currency effects — bunker fuel is universally priced in USD; non-USD operators (European, Japanese, Korean shipping lines) face additional exchange rate exposure
Seasonal demand — shipping activity peaks in Q3–Q4 (pre-Christmas supply chain), pushing bunker demand and prices higher in those periods

Hub	Region served	Annual volumes (Mt/yr approx.)	Key feature
Singapore	Asia-Pacific, trans-Pacific	~50–55 Mt	World's largest bunkering hub; price benchmark for Asia
Rotterdam ARA	Europe, trans-Atlantic	~12–14 Mt	Europe's largest; linked to ARA gasoil/fuel oil markets
Fujairah (UAE)	Middle East, East–West trade	~8–10 Mt	Rapid growth; key Suez transit refuelling point
Houston/US Gulf	Americas, Caribbean	~6–8 Mt	WTI-linked; key for US Gulf exports
Zhoushan (China)	Far East	~5–7 Mt	China's free trade zone bunker hub; rapid growth

Scrubber economics: HSFO vs VLSFO

Exhaust gas cleaning systems (EGCS) — colloquially called scrubbers — allow ships to continue burning cheaper HSFO while meeting IMO 2020 sulphur limits by washing exhaust gases with seawater or fresh water. The economics depend entirely on the spread between HSFO and VLSFO:

A typical large container vessel burns approximately 100–200 tonnes/day of fuel
At a $100/tonne HSFO–VLSFO spread, a 150 t/day vessel saves approximately $15,000/day, or ~$5 million/year at sea
Open-loop scrubber installation cost: approximately $2–4 million; payback period at $100/t spread: less than 1 year for large vessels
However, open-loop scrubbers discharge washwater to sea, and are banned in many ports (China, Singapore in harbour, numerous ECAs)
Closed-loop scrubbers are permitted in restricted zones but cost more and require washwater sludge disposal

As of 2026, approximately 4,500–5,000 vessels (mostly large container ships, tankers, and bulk carriers) are fitted with scrubbers. The HSFO market has consolidated around scrubber-fitted vessels as buyers; non-scrubber shipping cannot legally purchase it for open-ocean use. For refinery product context, see our crude oil glossary entry.

Alternative marine fuels: LNG, methanol, and ammonia

The shipping industry faces IMO's ambition to achieve net-zero greenhouse gas emissions by 2050. Road transport fuels (petrol, diesel) are being displaced by electricity; marine fuels face a different transition landscape with several competing alternatives:

Fuel	GHG reduction vs HFO	Infrastructure maturity	Key adopters
LNG	15–20% on life-cycle basis (methane slip offsets)	Good: 200+ LNG bunkering vessels globally	MSC, CMA CGM, Carnival (cruise)
Bio-LNG	Up to 90% well-to-wake	Limited supply; premium cost	Growing; blended with fossil LNG
Methanol (grey)	5–10% vs HFO	Early: ~20 methanol vessels in service	Maersk (174 methanol dual-fuel on order)
Green methanol	~95% well-to-wake	Very limited supply; high cost (~$1,000–1,500/t)	Maersk strategic bet
Ammonia	Near-zero if green	Pre-commercial; pilot vessels only	MAN Energy Solutions engines in development
Hydrogen	Near-zero if green	Very early; energy density challenge	Short-sea/ferry projects

For the broader energy transition context affecting all transport fuels, see our energy transition glossary entry. For aviation fuel's parallel alternative fuel challenge (SAF), see our aviation fuel guide.

How bunker costs affect freight rates and consumer prices

Bunker Adjustment Factor (BAF)
Most container shipping contracts include a Bunker Adjustment Factor (BAF) or Fuel Adjustment Factor (FAF) — a surcharge applied on top of the base freight rate that adjusts periodically (typically quarterly) to reflect current bunker prices. Major carriers (Maersk, MSC, CMA CGM, COSCO) publish BAF schedules that specify the surcharge per TEU per trade lane as a function of the prevailing VLSFO price. When Singapore VLSFO rises from $450/t to $600/t, BAF surcharges on Asia–Europe routes typically increase by $50–100/TEU. This mechanism partially insulates shipping lines from fuel price volatility but passes the cost to cargo owners.

The relationship between bunker costs and freight rates is non-linear because fuel is only one input into shipping economics:

In periods of tight vessel capacity (2021–2022 COVID supply chain crisis), freight rates were driven primarily by supply/demand imbalance; fuel costs were almost irrelevant at $10,000–20,000/FEU spot rates
In periods of loose capacity (2016, 2023–2024), bunker cost changes flow more directly into freight rates because carriers have less pricing power
Bulk commodity freight (iron ore, coal, grain, crude oil on tankers) is more sensitive to bunker costs because freight rates are lower relative to cargo value and fuel is a larger share of voyage economics

For context on how oil sanctions and trade route disruptions affect both bunker demand and supply chain costs, see our Russia oil sanctions 2026 analysis. For OPEC+ production decisions that affect crude oil and hence bunker prices, see our OPEC+ glossary entry.

Marine fuel types, bunkering and consumption explained

Understanding what is bunker fuel requires looking at the full spectrum of marine fuel types used in commercial shipping. The bunker fuel meaning derives from the coal bunkers on early steamships — today it refers to any fuel stored in a vessel's tanks for propulsion. What is heavy fuel oil? HFO (HFO meaning: Heavy Fuel Oil) is the thick, viscous residual product from crude oil refining — the cheapest fuel grade but also the most polluting (3.5%+ sulphur content). Since IMO 2020, HFO use is restricted to scrubber-equipped vessels. Marine diesel vs diesel is an important distinction: marine gas oil (MGO) is a distillate fuel similar in composition to road diesel but manufactured to ISO 8217 marine specifications. Marine gas oil meaning and marine gas oil price track closely with road gasoil/diesel pricing, typically trading at $450–650/tonne depending on crude oil levels. The comparison of HFO vs MGO centres on cost versus emissions: HFO costs $200–350/tonne but requires scrubbers; MGO costs $450–650/tonne but is ECA-compliant without any exhaust treatment. The IEA's international shipping report provides comprehensive data on marine fuel consumption patterns and the transition towards lower-emission fuels.

What is VLSFO? VLSFO (Very Low Sulphur Fuel Oil) became the dominant marine fuel after IMO 2020 mandated a maximum 0.5% sulphur content for open-ocean operation. VLSFO vs HSFO (High Sulphur Fuel Oil) is the central trade-off in modern marine fuel economics: VLSFO costs more ($350–550/tonne) but is compliant without scrubbers, while HSFO ($200–350/tonne) requires a $2–5 million scrubber installation. What is bunkering? The ship bunkering process involves loading fuel from shore-based terminals, barges, or ship-to-ship transfers at major ports. Bunkering is a specialised logistics operation — a large container vessel may take on 3,000–5,000 tonnes of fuel in a single bunkering stop. Low sulfur marine fuel availability has expanded dramatically since 2020, with all major bunkering hubs (Singapore, Rotterdam, Fujairah) now offering VLSFO as their primary product. Bunker fuel price is assessed daily by S&P Global Platts at key ports, with Singapore VLSFO typically serving as the global reference price. The OPEC Monthly Oil Market Report tracks the crude oil fundamentals that drive bunker fuel pricing.

Marine fuel consumption is enormous at the individual vessel level. How much fuel does a cargo ship use? A large container vessel (20,000 TEU capacity) burns approximately 150–250 tonnes of fuel per day at sea — equating to ship fuel cost per day of $50,000–150,000 depending on fuel grade and speed. A ship fuel cost calculator requires three inputs: daily fuel consumption (tonnes/day), fuel price ($/tonne), and voyage days at sea. At 200 tonnes/day VLSFO consumption and $500/tonne price, a 30-day Asia-Europe voyage costs approximately $3 million in fuel alone. Marine fuel oil price volatility makes fuel cost prediction challenging — prices can swing 20–30% within a quarter based on crude oil movements, refinery outages, and seasonal demand. Marine fuel emissions are a major environmental concern: international shipping accounts for approximately 2.5–3% of global CO₂ emissions, and the IMO's Carbon Intensity Indicator (CII) regulation is pushing vessel operators towards slower steaming, alternative fuels, and efficiency retrofits. The BP Statistical Review of World Energy and the EU's maritime emissions framework (FuelEU Maritime) provide the regulatory and market data context for marine fuel transitions.

Frequently asked questions

What is bunker fuel? Bunker fuel is the general term for marine fuel oil stored in a ship's bunker tanks. Historically it meant heavy fuel oil (HFO); since IMO 2020, most vessels use VLSFO (very low sulphur fuel oil, <0.5% S) on the open ocean and MGO (marine gas oil, <0.1% S) in emission control areas. It represents 40–60% of typical vessel operating costs.: Bunker fuel is the general term for marine fuel oil stored in a ship's bunker tanks. Historically it meant heavy fuel oil (HFO); since IMO 2020, most vessels use VLSFO (very low sulphur fuel oil, <0.5% S) on the open ocean and MGO (marine gas oil, <0.1% S) in emission control areas. It represents 40–60% of typical vessel operating costs.
What is VLSFO and how does it differ from MGO? VLSFO is a blended fuel oil with <0.5% sulphur — the IMO 2020 global ocean standard. MGO is a cleaner distillate fuel with <0.1% sulphur, required in ECAs (North Sea, Baltic, English Channel, North American coast). MGO is typically $50–150/tonne more expensive than VLSFO but mandatory near coasts and in ports.: VLSFO is a blended fuel oil with <0.5% sulphur — the IMO 2020 global ocean standard. MGO is a cleaner distillate fuel with <0.1% sulphur, required in ECAs (North Sea, Baltic, English Channel, North American coast). MGO is typically $50–150/tonne more expensive than VLSFO but mandatory near coasts and in ports.
How do bunker prices affect consumer goods prices? Marine fuel costs feed into freight rates via BAF (Bunker Adjustment Factor) surcharges. A $100/tonne VLSFO price rise typically adds $100–300/FEU to container freight rates. Direct per-unit impact on consumer goods is small for high-value items but more significant for bulky, low-value commodities (furniture, appliances, food). Sustained high bunker prices contribute to broader inflationary freight cost pressures.: Marine fuel costs feed into freight rates via BAF (Bunker Adjustment Factor) surcharges. A $100/tonne VLSFO price rise typically adds $100–300/FEU to container freight rates. Direct per-unit impact on consumer goods is small for high-value items but more significant for bulky, low-value commodities (furniture, appliances, food). Sustained high bunker prices contribute to broader inflationary freight cost pressures.
How much fuel does a large cargo ship use per day? A large container vessel (15,000–20,000 TEU) burns approximately 150–250 tonnes of fuel per day at cruising speed (18–22 knots). A VLCC (Very Large Crude Carrier) tanker burns 60–100 tonnes/day. A Capesize bulk carrier burns 40–70 tonnes/day. "Slow steaming" — reducing speed by 10–20% — can cut daily fuel consumption by 25–40% at the cost of longer voyage times. At $500/tonne VLSFO, daily fuel costs for a large container vessel range from $75,000–125,000.: A large container vessel (15,000–20,000 TEU) burns approximately 150–250 tonnes of fuel per day at cruising speed (18–22 knots). A VLCC (Very Large Crude Carrier) tanker burns 60–100 tonnes/day. A Capesize bulk carrier burns 40–70 tonnes/day. "Slow steaming" — reducing speed by 10–20% — can cut daily fuel consumption by 25–40% at the cost of longer voyage times. At $500/tonne VLSFO, daily fuel costs for a large container vessel range from $75,000–125,000.
What is the difference between VLSFO and HSFO? VLSFO (Very Low Sulphur Fuel Oil) has a maximum 0.5% sulphur content and is the IMO 2020 compliant standard for open-ocean use — no exhaust treatment required. HSFO (High Sulphur Fuel Oil) has 3.5%+ sulphur content and is significantly cheaper ($150–200/tonne less than VLSFO) but can only be legally used on vessels equipped with scrubbers (exhaust gas cleaning systems). Scrubber installation costs $2–5 million; the payback depends on the HSFO-VLSFO spread. Approximately 4,500–5,000 vessels globally are scrubber-equipped as of 2026.: VLSFO (Very Low Sulphur Fuel Oil) has a maximum 0.5% sulphur content and is the IMO 2020 compliant standard for open-ocean use — no exhaust treatment required. HSFO (High Sulphur Fuel Oil) has 3.5%+ sulphur content and is significantly cheaper ($150–200/tonne less than VLSFO) but can only be legally used on vessels equipped with scrubbers (exhaust gas cleaning systems). Scrubber installation costs $2–5 million; the payback depends on the HSFO-VLSFO spread. Approximately 4,500–5,000 vessels globally are scrubber-equipped as of 2026.
What is ship bunkering and how does it work? Bunkering is the process of loading fuel onto a vessel. It can be done from shore-based terminals via pipeline connections, from dedicated bunkering barges alongside in port, or via ship-to-ship transfer at anchorage. Large vessels typically bunker 3,000–5,000 tonnes per stop. Major bunkering hubs include Singapore (world's largest, ~50 Mt/year), Rotterdam, Fujairah (UAE), Houston, and Zhoushan (China). Bunker fuel quality and quantity are verified by independent surveyors (e.g. Intertek, Bureau Veritas) to prevent disputes over fuel quantity or off-spec delivery.: Bunkering is the process of loading fuel onto a vessel. It can be done from shore-based terminals via pipeline connections, from dedicated bunkering barges alongside in port, or via ship-to-ship transfer at anchorage. Large vessels typically bunker 3,000–5,000 tonnes per stop. Major bunkering hubs include Singapore (world's largest, ~50 Mt/year), Rotterdam, Fujairah (UAE), Houston, and Zhoushan (China). Bunker fuel quality and quantity are verified by independent surveyors (e.g. Intertek, Bureau Veritas) to prevent disputes over fuel quantity or off-spec delivery.