What is Base and Quote Currency?
In any currency pair, the first currency listed is the "base" and the second is the "quote." The rate tells you how much quote currency you get for one unit of base currency. In EUR/USD, EUR is the base and USD is the quote.
Definition
Currency pair notation follows a fixed convention: the base currency is always written first, the quote (or "counter" or "term") currency second. When you see "EUR/USD = 1.0851," that means 1 EUR = 1.0851 USD — you trade one unit of the base for 1.0851 units of the quote. Conventions for which currency is base vs quote are set by historical market practice: EUR is base when paired with USD, GBP, JPY, CHF, AUD, CAD; GBP is base when paired with USD, JPY, CHF; AUD is base when paired with USD, NZD, JPY; etc. The hierarchy roughly follows: EUR > GBP > AUD > NZD > USD > CAD > CHF > JPY. This is why you see "GBP/USD" (not USD/GBP) and "USD/JPY" (not JPY/USD).
Worked example
Reading rates: • EUR/USD = 1.0851 → 1 EUR = 1.0851 USD (or $1.085). • USD/JPY = 150.25 → 1 USD = ¥150.25. • GBP/USD = 1.2700 → £1 = $1.27. • AUD/NZD = 1.0850 → A$1 = NZ$1.085. Reversing: if EUR/USD = 1.0851, then USD/EUR = 1 / 1.0851 = 0.9216 (so $1 = €0.92).
Why it matters
Knowing base vs quote prevents costly mistakes when reading rates. The rate is always "1 unit of base = X units of quote" — getting this backwards leads to 10x or 100x miscalculations. Our converter and all major retail tools handle this internally and just show you the result of converting a specific amount, but it helps to understand the convention when reading market news.
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Frequently asked questions
Why is EUR always base versus USD?
Historical convention from the early 1990s when EUR was first quoted (as the ECU before 1999). The European Commission specified that EUR would be quoted as base against all other currencies — a deliberate statement of euro's reserve-currency aspirations. This convention has stuck and is now universal in interbank quoting.
What about EUR/GBP — which is base?
EUR is base, GBP is quote. EUR/GBP = 0.85 means 1 EUR = £0.85. This follows the same EUR-first hierarchy. Some UK-domiciled retail brokers display GBP/EUR (1 GBP = €X) instead because UK customers find that direction more intuitive, but the institutional convention is EUR/GBP.
Why is USD/JPY quoted instead of JPY/USD?
USD is base over JPY because USD outranks JPY in the historical quoting hierarchy. The rate "USD/JPY = 150" means 1 USD = ¥150 — which is much easier to read than "JPY/USD = 0.00667" (1 JPY = $0.00667). The base/quote convention often follows whichever direction produces a more readable number.
Related terms
Cross Rate
A cross rate is the exchange rate between two currencies, neither of which is the US Dollar. Examples include EUR/GBP, AUD/JPY, and CAD/CHF. They are quoted directly even though most underlying liquidity flows through USD legs.
Mid-Market Rate
The mid-market rate is the midpoint between the buy (bid) and sell (ask) price of a currency in the global interbank market. It is the fairest reference rate available and what Google, Reuters, Bloomberg, and Wise all display as "the exchange rate."
Pip (Forex)
A pip ("percentage in point") is the smallest standard price increment for a currency pair, typically the fourth decimal place (0.0001) for most pairs or the second decimal place (0.01) for pairs involving the Japanese Yen.