Base Currency
Quick Answer
The base currency is the first currency shown in a forex pair and represents the currency being priced in terms of the second, or quote, currency. In EUR/USD, for example, EUR is the base currency. If EUR/USD is 1.1000, one euro is valued at 1.10 US dollars.
How does Base Currency work?
Currencies in the foreign-exchange market are quoted in pairs because one currency is being valued relative to another.
A currency pair is commonly written as:
Base Currency / Quote Currency
For example:
EUR/USD
Here:
EUR = Base Currency
USD = Quote Currency
If EUR/USD is quoted at:
1.1000
the quotation means:
1 EUR = 1.10 USD
The base currency is treated as one unit, and the exchange rate tells the trader how many units of the quote currency are required to represent that unit.
ISO 4217 provides the internationally used three-letter currency codes, such as EUR for the euro, USD for the US dollar and JPY for the Japanese yen. The ordering and quotation conventions used in foreign-exchange markets determine which currency appears as the base and which appears as the quote currency.
Key features of Base Currency
Several characteristics are important when reading currency pairs:
It appears first: In a standard currency pair such as GBP/USD, GBP is the base currency.
It is valued in the quote currency: The exchange rate tells you how many units of the second currency correspond to one unit of the base currency.
It helps determine directional interpretation: If EUR/USD rises, the euro has appreciated relative to the US dollar, assuming the quotation convention remains unchanged.
Buying a currency pair means buying the base currency: In conventional forex terminology, buying EUR/USD represents buying EUR while selling the equivalent value of USD.
Selling reverses the relationship: Selling EUR/USD represents selling the base currency against the quote currency.
It is not necessarily the trader's account currency: The currency used to denominate a trading account is a separate concept.
Simple Base Currency example
Suppose:
GBP/USD = 1.3200
The base currency is:
GBP
The quote currency is:
USD
The quotation means:
£1 = $1.32
Now suppose GBP/USD rises to:
1.3400
The number of US dollars required to represent one British pound has increased:
£1 = $1.34
In simple terms, GBP has strengthened relative to USD over that movement.
If the pair instead falls from 1.3200 to 1.3000, one pound buys fewer US dollars, meaning GBP has weakened relative to USD.
This example is illustrative only and does not represent current FxGrow prices or a forecast of GBP/USD.
Potential benefits and uses
Understanding base currency helps traders correctly interpret forex quotations.
It can help with:
identifying which currency is being bought or sold;
understanding whether a currency has strengthened or weakened;
reading bid and ask prices correctly;
interpreting profit-and-loss movements;
understanding currency exposure;
distinguishing currency-pair terminology from account-currency terminology.
For instance, if a trader expects the euro to strengthen relative to the US dollar, that view relates directly to the base/quote structure of EUR/USD.
However, a movement in a pair always represents a relative change between two currencies, not an isolated change in only one currency.
Risks, limitations and common misconceptions
A common misconception is that the base currency is the currency in which the trader's account is denominated.
It is not.
Base currency describes the first currency in a forex quotation, while account currency describes the currency used to express values within a trading account.
For example, a trader could have a USD-denominated account while trading:
EUR/JPY
In that pair:
EUR is the base currency
JPY is the quote currency
The trading account could still be denominated in USD.
Another misconception is that a rising currency pair means both currencies are becoming more valuable. A currency pair expresses one currency relative to another. If EUR/USD rises, the euro has strengthened relative to the dollar, or the dollar has weakened relative to the euro, or a combination of both.
Currency-pair conventions are also important. Traders should read the actual pair rather than assume a particular currency will always be quoted first.