What Is a Crack Spread? Crude, Product Prices, and a Refining Proxy

The U.S. Energy Information Administration describes crack spreads as differences between wholesale petroleum-product prices and crude-oil prices. The relationship begins with a stated crude input and one or more stated products, such as gasoline or distillate fuel. It is a way to record how those selected price references differ at a defined time.

The word “crack” refers to refining crude oil into smaller, useful products. That production context does not make every price difference a refinery result. A quoted spread may use spot references, futures references, or a mixture that must be disclosed before it can be compared with another number.

Futures versus spot markets explains why an immediate-delivery reference and a dated contract price are different records. State which one appears on each side of a crack-spread calculation.

A single-product, or one-to-one, crack compares one barrel-equivalent of a specified product with one barrel of a specified crude reference. It narrows the question to that product relationship. A multiple-product crack combines selected product references in a stated yield ratio before comparing them with crude.

The common three-to-two-to-one form uses three barrels of crude, two barrels of gasoline, and one barrel of distillate in its stated relationship. EIA describes it as an approximation of a typical U.S. refining yield, not a claim that every refinery produces the same output mix. Other ratios, products, locations, or grades answer different questions.

The 3-2-1 crack spread walks through the unit conversion and ratio record. Do not silently replace its inputs with a different crude, product grade, or product location.

A price difference only becomes interpretable after its units match. Crude is often quoted in dollars per barrel, while a refined product can be quoted in dollars per gallon. EIA's 3:2:1 explanation multiplies a product price by 42 gallons per barrel before comparing it with a barrel-based crude price.

The same discipline applies to futures quotes. A contract's multiplier, minimum price increment, and quote unit describe how a displayed price becomes one contract's dollar scale. Futures tick value and contract multipliers separates those fields from the number of contracts or the current margin requirement.

Two numbers both called a gasoline crack can describe different economic relationships. The crude grade, gasoline formulation, delivery or pricing location, pricing service, quote side, observation time, and month can differ. Local and seasonal product conditions can also diverge from a broad crude-oil reference.

This is a basis-risk problem: a reference used to describe or hedge an exposure may not match the exposure's grade, location, or timing. Futures hedge ratio and basis risk gives a framework for recording that mismatch rather than treating a similar name as proof of equivalence.

A crack spread combines different commodities or product references. A futures calendar spread instead compares different contract months of the same named futures product. The two use the word “spread,” but their inputs, delivery periods, and economic questions are different.

Futures calendar spreads separates the two-month relationship from a crude-to-product relationship. Neither label establishes a future direction, an executable fill, a margin amount, or a complete physical-business result. Read the current product specification before turning a chart label into a position or accounting conclusion.

This guide explains a price relationship, not a recommendation to trade a commodity future, operate a refinery, or infer a company's result. Current contract terms, market data definitions, and account policies control an actual transaction.