In any currency pair, the base currency is the first currency listed and the quote currency (also called the terms currency) is the second. The exchange rate tells you how many units of the quote currency are needed to buy one unit of the base currency. In EUR/USD at 1.0850, the euro is the base and the US dollar is the quote, so one euro costs 1.0850 dollars.
How Do You Read a Currency Pair?
Read the pair left to right: one unit of the base currency expressed in the quote currency. The base is always the unit being priced; the quote is the price.
So if GBP/USD is 1.2700, one British pound costs 1.27 US dollars. If the rate rises to 1.2750, the pound has strengthened against the dollar, because each pound now buys more dollars.
Why Does the Order Matter?
The order is a market convention, and getting it right is essential to knowing which currency you are actually buying or selling. Buying a pair means buying the base and selling the quote; selling the pair is the reverse.
Conventions are well established — for example, the euro is conventionally the base against the dollar — and a quoted rate only makes sense once you know which currency sits in which position.
Base and Quote vs. American and European Terms?
The same rate can be expressed two ways. A European-terms quote gives the amount of a currency per one US dollar, while an American-terms quote gives dollars per one unit of the other currency. Which currency is base and which is quote determines which of these you are looking at.
Related Terms: Spot Rate, Pip, Currency Pair, Cross Rate, Reciprocal Rate. See the full glossary for more.
This is educational content, not financial or trading advice.