How to Price Oil: Benchmarks, Differentials, Spreads

To price a barrel of oil you do two things: pick the benchmark that matches the barrel's quality and delivery region, then adjust that benchmark by a differential for how your crude differs from it. The Oxford Institute for Energy Studies describes the standard market convention as formula pricing, written as P(X) = P(R) ± D, where P(X) is the price of crude X, P(R) is the reference or marker price, and D is the differential. For a live reference point: Brent crude, the international marker, settled at $105.83 per barrel on September 16, 2026, down 2.7% on the day, while US West Texas Intermediate futures closed at $102.43, down 3.2%, according to CNBC's market report that afternoon.

Quick answer

• The formula: price = benchmark marker ± differential. The differential reflects crude quality (density and sulfur) and delivery location, not a separate market.
• Choose the marker by region: per the Oxford Institute for Energy Studies, nearly all oil traded outside the Americas and the Far East prices off Brent, WTI is the main benchmark for US imports, and Dubai-Oman is the benchmark for Gulf crudes sold into Asia-Pacific.
• Today's level: Brent $105.83 and WTI $102.43 at the September 16, 2026 settlement (CNBC), a Brent-WTI spread of $3.40 by our subtraction. Prices had rallied more than 16% so far in September as fighting escalated in the Persian Gulf.
• Forecasts are not quotes: the EIA's September 2026 Short-Term Energy Outlook, with inputs finalized September 3, 2026, forecast Brent averaging around $90 per barrel in the second half of 2026 and $73.74 in 2027. Events after that date are not in the number.
• Specify the contract: a WTI futures quote refers to a specific delivery month; the CME contract is 1,000 barrels, with a one-cent minimum tick worth $10, physically delivered at Cushing, Oklahoma.

Why oil is priced off a benchmark rather than quoted grade by grade

There are hundreds of distinct crude streams, each with its own density, sulfur content and loading port. Quoting every one independently would be unworkable, so the market prices almost everything against a handful of markers. The Intercontinental Exchange, which lists the Brent complex, puts the role plainly: Brent is "the price of oil," and other grades establish their own value through price relationships to it.

Two terms do most of the work. Light versus heavy refers to density, measured in API gravity; lighter crude yields more gasoline and diesel per barrel with less processing. Sweet versus sour refers to sulfur content; sour crude needs more treating and is worth less to a refinery that lacks the right units. A barrel that is heavier and more sour than the marker prices at a discount; a lighter, sweeter barrel closer to a premium market prices at a premium. Freight is the other half of the differential: a cargo loading in West Africa and discharging in Asia carries a shipping cost that has to sit somewhere in the price, which is why contracts specify whether the price is FOB at the load port or delivered at the destination.

Which benchmark applies to which barrel

ICE notes that these markers all essentially trade at a differential to Brent, which is why a trader watching one regional spread is implicitly watching the others. The benchmarks also behave differently under stress. WTI is delivered inland at a storage hub, so US pipeline and storage bottlenecks can push it to a discount that has nothing to do with global demand, while Brent and Dubai respond faster to seaborne supply disruption. That difference is visible right now: Brent's premium to WTI sits at $3.40 using the September 16 settlements above, during a period when the disruption is concentrated in the Persian Gulf.

What oil costs today, and what moved it

Reported market facts for the current week: CNBC reported Brent settling at $105.83 and WTI at $102.43 on September 16, 2026, with both falling after the US Energy Secretary said a damaged Saudi pipeline would restart within days; the same report noted prices were up more than 16% for the month. Trading Economics reported the same session with Brent near $106 and cited official US data showing commercial crude inventories down 640,000 barrels to 423.4 million barrels, against an American Petroleum Institute estimate that had pointed to a 7.1 million-barrel build.

That inventory gap is a useful illustration of price discovery in practice rather than a forecast: two estimates of the same week's stocks pointed in opposite directions, and the official number is the one the market trades against. The EIA publishes those commercial crude inventory figures weekly on Wednesdays, and CME's own trader education material describes the release as a leading short-term indicator, with a larger-than-expected build implying weaker demand and an unexpected decline implying the opposite.

Set the current quote next to the official forecast and you can see how fast the gap opens. The EIA's September 2026 Short-Term Energy Outlook reported Brent averaging $91 per barrel in August, $7 above July, and forecast around $90 per barrel for the second half of 2026, with quarterly projections of $90.66 in the fourth quarter of 2026 falling to $63.94 by the fourth quarter of 2027. The agency states that it finalized model inputs on September 3, 2026, and that the forecast does not specifically account for market events after that day. Mid-September settlements above $105 sit above that path. The forecast is not wrong as published; it is a monthly average projection built on a known cutoff date, and the spot quote is a settlement at a moment in time. Comparing them tells you how much of the current price is recent event risk.

Worked example: cargo, hedge and gallon

These three calculations are illustrative arithmetic using assumed differentials and volumes, not reported transactions. The benchmark inputs are the September 16, 2026 settlements reported by CNBC.

1. Pricing a physical cargo. Assume a 500,000-barrel cargo of a medium sour Gulf grade sold to an Asian refiner, priced off a monthly average marker of $104.00 per barrel with a contract differential of minus $3.20 per barrel. Cargo price per barrel = $104.00 − $3.20 = $100.80. Cargo value = $100.80 × 500,000 = $50,400,000. Note what the differential is doing: at that discount, a one-dollar move in the marker changes the invoice by $500,000, while renegotiating the differential by 20 cents changes it by $100,000. Term contracts typically fix the differential for a period and let the marker float, so the buyer and seller are arguing about a much smaller number than the headline price.

2. Hedging with futures. A producer expecting to sell 10,000 barrels next month sells 10 CME WTI contracts, since the contract size is 1,000 barrels. If WTI falls $5 per barrel before the producer sells the physical barrels, the futures position gains $5 × 1,000 × 10 = $50,000, offsetting most of the $50,000 shortfall on the physical sale at the lower price. The offset is not exact in practice: the producer's local realized price moves on its own basis differential, and margin is posted and settled daily against the futures position. Using CME's tick convention, each one-cent move in that 10-contract position is $100.

3. Crude cost per gallon. A barrel is 42 US gallons. At the September 16 Brent settlement of $105.83, crude alone is $105.83 ÷ 42 = $2.52 per gallon; at the WTI settlement of $102.43, it is $2.44. This figure is the crude input only. It excludes refining margin, distribution, retail markup and federal and state fuel taxes, so it is a floor for pump economics rather than a pump price forecast.

What makes the price change from one day to the next

The EIA groups the drivers into seven factors covering both physical market dynamics and trading and finance. The ones that move a quote inside a single session are these:

• Supply interruptions and their expected duration. The September 16 decline followed an official statement that a damaged Saudi pipeline outage would be measured in days, while independent analysts cited by CNBC warned satellite imagery of a damaged pumping station suggested weeks. The price moved on the change in expected duration, not on a change in barrels already lost.
• Spare capacity and risk premium. The EIA explains that when a potential disruption coincides with spare production capacity and inventories that look insufficient to offset it, prices can sit above the level current supply and demand alone would justify.
• OPEC production decisions and expectations. The EIA notes that prices respond to expected future supply and demand, and that lags in OPEC's target adjustments can themselves affect prices.
• Inventories. The weekly EIA stock change is the market's most frequent read on whether the physical balance is tightening or loosening.
• Demand, especially non-OECD. The EIA points out that a better economic outlook raises expected future prices, which increases the incentive to hold inventory, which reduces available current supply and pushes current prices up.
• Financial market positioning. The EIA describes both commercial hedgers such as oil companies and airlines and non-commercial investors trading oil instruments, with futures serving as a venue for price discovery.

One caution on reading these together: a price move that coincides with a headline does not establish that the headline caused it. The defensible statement is the one CNBC made, that prices fell on a session in which the pipeline restart guidance landed.

Four mistakes that produce the wrong number

• Quoting a benchmark as someone's realized price. As the mineral-interest platform Valor notes for royalty owners, the owner is paid the operator's actual sale price less post-production deductions and the local basis differential, which typically runs below the headline spot number.
• Mixing a settlement with an intraday print. On September 16, 2026, Fortune reported Brent at $108.34 at 7 a.m. Eastern, while CNBC reported a $105.83 settlement that afternoon. Both can be accurate. Always record benchmark, contract month and timestamp.
• Treating Brent and WTI as interchangeable. They are different grades at different delivery points, and the spread is itself a traded market.
• Using an annual average forecast as a spot price. The EIA's $91.01 average projection for 2026 Brent, as reported from the September 2026 STEO, is a full-year mean, not a price you can transact at on any given day.

What to do next

Write down the four fields that define any oil price before you use one: benchmark, contract or assessment month, timestamp, and differential. If you are pricing a real barrel rather than reading a headline, the single most useful next step is to pull the EIA's weekly petroleum status data for the current week and compare its inventory change with the differential in your own contract, because that is where your price and the benchmark part company.