Base Currency

The base currency is always the first currency listed in a forex pair. In EUR/USD, the euro is the base; in USD/JPY, the dollar is the base. When the exchange rate is quoted, it tells you how much of the second currency (the quote currency) you need to buy one unit of the base.

This convention matters because when you "buy" a currency pair, you're buying the base currency and simultaneously selling the quote currency. If you buy EUR/USD, you're going long on the euro and short on the dollar. Understanding this duality is fundamental to forex trading — every trade is a bet on relative strength.

The base currency also determines how pip values are calculated. For pairs where USD is the quote currency (EUR/USD, GBP/USD), pip values are straightforward in dollar terms. When USD is the base (USD/JPY, USD/CHF), pip values fluctuate based on the exchange rate, adding a small layer of complexity to position sizing.