1 Why oil is priced in US dollars
Crude oil contracts on the NYMEX (WTI futures) and ICE (Brent futures) exchanges are denominated in US dollars. This convention, established through the 1970s OPEC agreements and US dollar dominance post-Bretton Woods, means that when you buy oil internationally, you pay in dollars regardless of your domestic currency.
The consequence is straightforward: any country that imports oil (which includes all but a handful of major producers) is exposed to fluctuations in the USD exchange rate on top of fluctuations in crude price. Japan, which imports 99.7 % of its crude, is an extreme example — see Japan fuel prices for how yen depreciation amplified the 2022–2024 pump price surge.
The Brent crude glossary entry explains how the benchmark price is formed and how a USD 10/barrel move reaches your tank.
2 The pass-through mechanism
When a country's currency depreciates against the USD, the domestic cost of a barrel of crude rises proportionally. However, the pass-through from crude cost to pump price is partial, because the pump price includes fixed-rate local taxes:
Fixed-rate excise duties (like the UK's fuel duty of 52.95p/litre or Japan's JPY 53.8/litre in excises) do not change when the exchange rate moves. This means the tax component absorbs the proportional shock. In a high-tax country where taxes represent 60 % of the pump price, a 10 % depreciation causes only a ~4 % increase at the pump (10 % × 40 % non-tax share).
| Country type | Tax share of pump price | Pass-through of 10 % depreciation |
|---|---|---|
| High-tax (Germany, UK, Norway) | 55–65 % | ~3.5–4.5 % |
| Mid-tax (USA, Australia) | 15–30 % | ~7–8.5 % |
| Low-tax / subsidised (Gulf states) | <10 % | ~9 % (but price is administered) |
See excise duty and pump price anatomy for the component breakdown by country group.
3 Converting prices fairly across currencies
When comparing fuel prices across countries, two conversions are required:
- Currency conversion: convert local price to a common currency (EUR or USD) using the current exchange rate
- Unit conversion: convert to a common volume unit (litre or US gallon) — the US uses gallons, the UK used imperial gallons historically
The FuelTheGuide Explorer performs both conversions automatically via the OpenVan dataset, which provides EUR-base rates for 150+ currencies updated daily. You can select any display currency from the selector.
A common mistake is comparing raw USD-converted prices without accounting for purchasing power — see the reading fuel price data guide for how to interpret apparent outliers. The national average price entry also covers how the source price is constructed before conversion.
4 Currency depreciation and the double shock
For fuel-importing countries, currency depreciation delivers a "double shock." The first shock is the direct import cost increase. The second shock is the effect on debt: many developing countries finance energy infrastructure with USD-denominated loans. A depreciation raises the local-currency debt service burden simultaneously with import costs.
| Country | Currency depreciation (2022–2024) | Additional pump price pressure (approx.) |
|---|---|---|
| Pakistan (PKR) | ~65 % vs USD | +PKR 40–60/litre from FX alone |
| Turkey (TRY) | ~60 % vs USD | Significant — see Turkey article |
| Japan (JPY) | ~40 % vs USD | Required METI subsidy (JPY 6 tn total) |
| Nigeria (NGN) | ~70 % vs USD (post-unification) | Major driver of 2023–2024 pump price surge |
The Pakistan fuel price reform article and Japan fuel prices article on this site cover the two most detailed country-level case studies of this mechanism.
5 Hedging and price lag
Large fuel importers — national oil companies, airline groups, major distributors — use currency and crude hedges to reduce short-term price volatility. A hedge means they lock in a USD exchange rate or a crude price in advance, insulating consumers from sudden swings. The cost of the hedge (a premium paid to the counterparty) is typically absorbed into the distribution margin.
Hedging creates a price lag: when Brent falls sharply, hedged importers may not pass through lower prices immediately because they are locked into higher contracted rates. The reverse is also true: a hedged importer can maintain pump prices when Brent spikes, as Japan's METI scheme demonstrated at the government level.
For airlines, the hedge rationale is covered in fuel hedging by airlines. Sovereign hedges (Mexico, for example, buys put options on crude to protect budget revenues) work on the same principle applied to an oil exporter.
6 Reading exchange-rate-adjusted data
When you use the FuelTheGuide Explorer or download data as CSV, all prices are converted to your selected display currency using the daily OpenVan exchange rates (EUR base). A few things to keep in mind:
- Week-over-week delta includes FX effect: a "rose" indicator may reflect currency movement rather than a local price change
- Purchasing power context matters: USD 2/litre is cheap in Norway (high income) but expensive in Ethiopia (low income) — compare income levels alongside prices
- Approximated prices: some countries with Approx quality badges have prices estimated from regional benchmarks; FX conversion adds a second layer of uncertainty
The full methodology is in how to read fuel price data. To compare prices right now, use the FuelTheGuide Explorer.
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Open the Explorer →Frequently asked questions
Why is crude oil priced in US dollars?
Crude oil has been priced in USD since the Bretton Woods era. The US dollar's role as global reserve currency, deep US financial markets, and dollar-denominated exchange contracts make it the natural settlement currency, exposing all non-dollar economies to exchange-rate risk on imports.
How does a 10 % currency depreciation affect petrol prices?
In high-tax countries where taxes are ~60 % of pump price, a 10 % depreciation causes only ~4 % pump price increase. In low-tax markets the pass-through is closer to 9 %. Fixed-rate excise duties absorb the proportional shock.
What is purchasing power parity (PPP) in the context of fuel prices?
PPP adjusts for the fact that a dollar of income buys different amounts in different countries. Petrol at USD 1.20/litre may be cheap in Germany but represents hours of work in a low-income country. PPP-adjusted burden indexes are the fairest cross-country comparison.
How does the FuelTheGuide Explorer handle currency conversion?
The Explorer converts all prices via EUR as the base currency using daily OpenVan exchange rates. You can select any display currency. All conversions use the same reference rate for internally consistent comparisons.