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An oil refinery separates crude oil into useful streams, converts some of those streams into higher-value products, and treats and blends them to meet specifications. It earns revenue mainly by selling the products it makes, but the gap between product prices and crude costs—a crack spread—is only a rough measure of its economics, not the refinery’s net profit.
What an oil refinery does
A refinery is a conversion business. It takes crude oil and sometimes other feedstocks and produces fuels and chemical feedstocks. The output can include gasoline, diesel and other distillates, jet fuel, liquefied refinery gases, fuel oil, asphalt-related material, and petrochemical feedstocks. No single product mix applies to every refinery: yields depend on the crude processed, the plant’s equipment, product specifications, and market demand.
The U.S. Energy Information Administration (EIA) groups the work into three stages: separation, conversion, and treatment. Crude and finished products are stored and then shipped, for example, by pipeline, train, or truck. EIA’s overview of refinery inputs and outputs explains the process and the range of products.
How crude becomes saleable products
1. Separation sorts components by boiling point
Refineries heat crude and send it into an atmospheric distillation tower. Components with different boiling points separate: lighter fractions rise higher, while heavier material remains lower in the tower. Some refineries use vacuum distillation to further separate heavy material under reduced pressure.
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2. Conversion changes the size or structure of molecules
Distillation separates what is already in the crude; conversion units change molecules to make more useful streams. Catalytic cracking and hydrocracking break heavier molecules into lighter ones. Reforming rearranges molecules in naphtha to create high-octane gasoline components. Alkylation combines certain gaseous byproducts into gasoline components.
3. Treatment and blending meet product requirements
Refineries treat intermediate streams to remove or adjust unwanted components, then blend streams to meet the specifications for products such as gasoline and diesel. The result is a saleable product slate, not simply crude divided into a fixed set of fractions.
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How a refinery makes money
At the simplest level, a refiner buys crude and other feedstocks, processes them, and sells the resulting products. Revenue comes chiefly from product sales. The economic question is whether the value realized from the entire output slate exceeds the costs of crude and other inputs, processing, and running the business.
Beyond feedstock costs, a refinery’s economics can include energy, labor, chemicals, maintenance, regulatory compliance, transport, financing, and fixed operating costs. The value of its products also depends on what it can actually sell them for, which may differ from a wholesale benchmark price. Sales arrangements vary: products may be sold under contracts or on the spot market, and integrated companies may also earn money through trading, pipelines, storage, marketing, or petrochemicals.
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A company example, not an industry average
PBF Energy reported in its 2024 filing that its refineries produced gasoline, distillates including diesel and jet fuel, and other products. It said most refined products were sold through short-term contracts or on the spot market. Gasoline and distillates represented 86.5% of PBF’s revenue in 2024; that figure describes PBF’s reported revenue mix for that year, not all refineries. PBF Energy’s 2024 annual filing provides the company-specific disclosure.
Why an integrated company’s results are not refinery-only profits
A company can own refineries alongside oil production, trading, pipelines, storage, product marketing, and petrochemical operations. Its reported earnings may combine or separately report these activities, so the company’s total result should not automatically be described as refinery profit. For example, PEMEX’s first-quarter 2026 filing distinguishes industrial-process product sales from trading-company and transportation-and-storage activities. PEMEX’s quarterly reports show why segment boundaries matter when interpreting an integrated company’s results.
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What a crack spread tells you—and what it leaves out
A crack spread compares the price of selected refined products with the price of crude oil used to make them. The EIA describes it as an indicator of short-term refinery profitability: it captures part of the product-versus-crude price relationship, but excludes other variable costs and fixed costs. It is therefore a margin proxy, not net profit.
The 3:2:1 crack spread
The commonly quoted 3:2:1 crack spread compares the value of two barrels of gasoline and one barrel of distillate with the cost of three barrels of crude. The difference is expressed per barrel of crude. The ratio is an approximation of a typical U.S. yield pattern; it does not mean every refinery produces exactly two barrels of gasoline and one barrel of distillate for each three barrels of crude processed. Refineries differ in equipment, feedstock, yields, and product markets.
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The EIA’s explanation, updated February 4, 2013, states: “Crack spreads are an indicator of the short-term profit margin of oil refineries because they compare the cost of the crude oil inputs to the wholesale, or spot, prices of the outputs (although they do not include other variable costs or any fixed costs).” See EIA’s 3:2:1 crack spread explanation.
For a fuller view of a refinery’s economics, consider the whole product slate and the plant’s actual circumstances, rather than relying on one benchmark spread. Relevant factors include:
- Crude slate and input cost: the crude grades processed and the prices paid for them.
- Configuration and conversion depth: the equipment available to turn heavier streams into lighter or more valuable products.
- Product mix and realized prices: which products the plant can make and the prices it actually receives.
- Utilization, reliability, and outages: how much the plant runs and whether disruptions limit output.
- Operating and compliance costs: energy, labor, maintenance, chemicals, and regulatory requirements.
- Location and logistics: access to crude, pipelines, transport, customers, and export markets.
A dated snapshot of U.S. refinery conditions
Market margins and operating conditions can move quickly, so current-looking figures need a date and geography. In an analysis published October 5, 2026, the EIA reported that average U.S. refinery utilization was 95% in the third quarter of 2026. It also said gasoline, distillate, and jet fuel crack spreads were elevated: the quarterly gasoline crack spread had more than doubled its year-earlier level, while distillate and jet fuel crack spreads had almost tripled theirs.
For the week ending September 25, 2026, U.S. distillate inventories were 13% below their 2021–2025 five-year average, gasoline inventories were 7% below, and jet fuel inventories were 3% above that average. These are U.S. figures for the stated periods and comparisons, not global averages or a standing description of refinery conditions. The EIA linked the market changes to tight global supplies and disruptions. See its October 5, 2026 review of U.S. petroleum markets.
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