Understand what base currency means in forex trading, how it works in currency pairs, and how to distinguish it from the quote currency using simple examples.
Updated October 15, 2026
Understand what base currency means in forex trading, how it works in currency pairs, and how to distinguish it from the quote currency using simple examples.
The base currency in forex trading is the first currency listed in a currency pair, and it’s the currency you’re buying or selling when you open a trade. In EUR/USD, the euro is the base currency and the US dollar is the quote currency. The exchange rate always tells you how much of the quote currency is needed to buy one unit of the base currency, so if EUR/USD is quoted at 1.1000, one euro costs 1.10 US dollars. When you buy a pair, you’re buying the base currency and selling the quote currency, expecting the base currency to strengthen; when you sell a pair, you’re selling the base currency and buying the quote currency, expecting it to weaken. The base currency also determines how trade sizes are measured, because a lot represents a number of units of the base currency. The encouraging truth is that once the base and quote relationship clicks, reading any forex quote becomes straightforward; the honest caveat is that misreading which currency you’re actually trading is one of the most common, and costly, beginner mistakes.
This guide explains exactly what the base currency is and why it matters: how to read a currency pair, what buying and selling a pair really means, how the base currency determines position size, how pip values and profits are calculated, how margin relates to the base currency, why pairs are written in a particular order, and how the base currency differs from your trading account’s base currency. The recurring theme is that every forex trade is a relationship between two currencies, and understanding which side is which is the foundation for every other forex calculation. Skyriss believes that mastering these fundamentals before trading is one of the most effective ways to avoid unnecessary mistakes. This article is educational and does not constitute investment advice; trading forex and CFDs carries a high risk of losing money rapidly due to leverage.
For those who want the essentials immediately, here’s how it works.
Every forex quote is a currency pair written as BASE/QUOTE. The base currency is the first currency, and it always equals one unit. The quote currency, also called the counter currency, is the second currency, and the exchange rate shows how much of it equals one unit of the base. So USD/JPY at 150.00 means one US dollar equals 150 Japanese yen.
When you buy a pair, you buy the base currency and sell the quote currency, profiting if the base currency strengthens relative to the quote. When you sell a pair, you sell the base currency and buy the quote currency, profiting if the base currency weakens. Trade sizes are measured in units of the base currency, so one standard lot of EUR/USD is 100,000 euros. Profits and losses are calculated in the quote currency and then converted into your account currency. Your account’s base currency, the currency your trading account is held in, is a separate concept from the base currency of the pair you trade. The rest of this guide explains each point in depth.
In forex, currencies are always traded in pairs, because you’re exchanging one currency for another. Each currency is identified by a three-letter code: USD for the US dollar, EUR for the euro, GBP for the British pound, JPY for the Japanese yen, and so on.
A currency pair is written with the base currency first and the quote currency second, separated by a slash, such as EUR/USD or GBP/JPY. The price, or exchange rate, tells you how many units of the quote currency are needed to buy one unit of the base currency.
Take GBP/USD quoted at 1.2700. The base currency is the British pound, the quote currency is the US dollar, and the quote means one pound is worth 1.27 dollars. If the rate rises to 1.2800, the pound has strengthened against the dollar, because one pound now buys more dollars. If it falls to 1.2600, the pound has weakened, because one pound now buys fewer dollars.
The key point is that the exchange rate always describes the value of the base currency in terms of the quote currency. A rising price means the base currency is strengthening, or the quote currency is weakening, or both. A falling price means the opposite.
Brokers display two prices for every pair. The bid is the price at which you can sell the base currency, and the ask is the price at which you can buy it. The ask is always slightly higher than the bid, and the difference between them is the spread, one of the main costs of trading. If EUR/USD shows a bid of 1.0998 and an ask of 1.1000, you would buy at 1.1000 and sell at 1.0998.
This is where understanding the base currency becomes essential, because every trade is defined from the base currency’s perspective.
When you buy a currency pair, also called going long, you’re buying the base currency and simultaneously selling the quote currency. You’re expecting the base currency to rise in value relative to the quote currency. Buying EUR/USD, for example, is a view that the euro will strengthen against the dollar.
When you sell a currency pair, also called going short, you’re selling the base currency and simultaneously buying the quote currency. You’re expecting the base currency to fall in value relative to the quote currency. Selling EUR/USD is a view that the euro will weaken against the dollar, or equivalently, that the dollar will strengthen against the euro.
Because a view on a currency can require either buying or selling, depending on where it sits in the pair. If you expect the US dollar to strengthen, you would sell EUR/USD, where the dollar is the quote currency, but buy USD/JPY, where the dollar is the base currency. Traders who focus on a single currency, such as the dollar, need to check its position in each pair before placing a trade. Getting this backwards means taking the opposite position to the one intended.
In forex, trade sizes are measured in lots, and a lot always refers to a number of units of the base currency.
A standard lot is 100,000 units of the base currency. A mini lot is 10,000 units, a micro lot is 1,000 units, and some brokers also offer nano lots of 100 units. Buying one standard lot of EUR/USD means buying 100,000 euros. Buying one standard lot of USD/JPY means buying 100,000 US dollars. Buying one standard lot of GBP/JPY means buying 100,000 pounds.
Because the real value of a position depends on the base currency, not just on the lot size. One standard lot of GBP/USD represents 100,000 pounds, which, with GBP/USD at 1.2700, is worth $127,000. One standard lot of USD/CHF represents $100,000. Although both trades are “one lot,” the underlying exposure differs because the base currencies differ. Understanding the notional value of a position in this way is essential for calculating risk accurately.
A pip is the standard unit for measuring price movement in forex. For most pairs, a pip is the fourth decimal place, or 0.0001. For pairs where the Japanese yen is the quote currency, a pip is the second decimal place, or 0.01.
Profits and losses on a forex trade are earned in the quote currency, because the price measures how much quote currency each unit of base currency is worth.
Imagine buying one standard lot (100,000 euros) of EUR/USD at 1.1000 and closing it at 1.1050. The price has risen 50 pips. Each pip on a standard lot of EUR/USD is worth 100,000 multiplied by 0.0001, which equals 10 US dollars. Fifty pips is therefore a profit of $500, earned in US dollars, the quote currency. Had the price fallen 50 pips instead, the loss would have been $500.
The calculation works the same way, but the result is in a different currency. On one standard lot of USD/JPY, a pip is 0.01 yen, so each pip is worth 100,000 multiplied by 0.01, which equals 1,000 yen. If USD/JPY is trading at 150.00, that’s worth about $6.67 per pip. Most trading platforms make this conversion automatically, translating profits and losses into your account currency, but understanding the underlying calculation helps you size positions correctly across different pairs.
When trading forex with leverage, you only need to deposit a fraction of the position’s full value, called margin. The margin requirement is calculated from the position’s notional value, which is based on the base currency amount.
For example, a standard lot of EUR/USD represents 100,000 euros. If EUR/USD is at 1.1000, that position is worth $110,000. With a margin requirement of 3.33%, equivalent to leverage of 30:1, the margin needed would be roughly $3,667. A standard lot of USD/JPY, by contrast, is $100,000, so the same margin rate would require about $3,333.
Because leverage magnifies the effect of every price movement on your account. If you misjudge the notional value of a position, perhaps by overlooking that one lot of a pound-based pair is larger than one lot of a dollar-based pair, you may take on far more risk than intended. Since losses can exceed what you expected, and leverage amplifies losses as much as gains, accurate position sizing is a core part of risk management. Leverage limits and margin requirements vary by broker, jurisdiction, account type and instrument.
You might wonder why the market quotes EUR/USD rather than USD/EUR, or USD/JPY rather than JPY/USD. The order follows market convention, which has developed over time.
The general convention places currencies in a priority order for the base position, commonly given as the euro first, followed by the British pound, the Australian dollar, the New Zealand dollar, the US dollar, the Canadian dollar, the Swiss franc and the Japanese yen. When two of these currencies are paired, the one higher in the order is usually the base. That’s why it’s EUR/USD, GBP/USD and AUD/USD, but USD/CAD, USD/CHF and USD/JPY.
From the perspective of a particular country, a direct quote shows the price of one unit of a foreign currency in the domestic currency, while an indirect quote shows the price of one unit of the domestic currency in a foreign currency. For a trader based in the United States, EUR/USD is a direct quote because it shows how many dollars one euro costs, and USD/JPY is an indirect quote because it shows how many yen one dollar buys. In practice, traders simply use the market convention for each pair.
Mathematically, yes. The inverse of a pair is found by dividing one by the exchange rate. If EUR/USD is 1.1000, then USD/EUR would be about 0.9091. However, trading platforms quote pairs using market convention, so traders work with the standard form and express their view by buying or selling.
The term “base currency” is used in two different ways in trading, and they’re easy to confuse.
The base currency of a currency pair is the first currency in the pair, as explained throughout this guide. The base currency of a trading account, more commonly called the account currency, is the currency in which your account balance, margin, profits and losses are held, such as US dollars, euros or UAE dirhams.
Because profits and losses earned in a pair’s quote currency must be converted into your account currency. If your account is held in US dollars and you trade EUR/GBP, your profit or loss is earned in pounds and then converted into dollars at the prevailing rate. That means movements in exchange rates can slightly affect the final value of profits and losses. Choosing an account currency that matches the currency you deposit and withdraw in can also reduce conversion costs.
When you hold a leveraged forex position overnight, a financing adjustment, often called a swap or rollover, is applied. This reflects the interest rate difference between the base and quote currencies, along with any broker charges.
If you buy a pair where the base currency has a higher interest rate than the quote currency, the adjustment may be positive or smaller, depending on the broker’s terms. If the base currency has a lower interest rate, the adjustment is more likely to be a cost. Swap rates differ between brokers and instruments, and they can change as interest rates move, so it’s worth checking them before holding positions overnight.
Understanding the base currency turns forex quotes from abstract numbers into clear statements about relative value. Before every trade, it helps to confirm which currency is the base, what direction your view requires you to trade, how large the position is in base currency terms, what each pip is worth in your account currency, and how much margin and risk the trade involves.
Skyriss offers CFD trading on major, minor and exotic currency pairs within a regulated environment, with platform tools that display pip values, margin requirements and position sizes. Using a demo account to practise reading quotes, placing trades and calculating outcomes is a practical way to build confidence before trading with real capital.
The base currency is the first currency in a pair. In EUR/USD, the euro is the base currency. The exchange rate shows how much of the second currency, the quote currency, is needed to buy one unit of the base currency.
The quote currency, also called the counter currency, is the second currency in a pair. In EUR/USD, the US dollar is the quote currency. Profits and losses on a trade are calculated in the quote currency.
Buying a pair means buying the base currency and selling the quote currency at the same time. You profit if the base currency strengthens against the quote currency.
Selling a pair means selling the base currency and buying the quote currency. You profit if the base currency weakens against the quote currency.
Yes. A lot always refers to units of the base currency. One standard lot of EUR/USD is 100,000 euros, while one standard lot of USD/JPY is 100,000 US dollars.
Market convention places currencies in a priority order for the base position, with the euro ranked first. As a result, whenever the euro is paired with another major currency, it’s quoted as the base.
No. The base currency of a pair is the first currency in that pair. Your account currency is the currency in which your trading account balance, margin and profits are held. Profits earned in a pair’s quote currency are converted into your account currency.
The base currency is one of the simplest concepts in forex, yet it underpins almost every other part of trading. It’s the first currency in every pair, the currency you’re buying or selling when you open a position, and the unit in which trade sizes are measured. The exchange rate always describes its value in terms of the quote currency, and that relationship determines what a rising or falling price means, how much each pip is worth, how margin is calculated and how profits and losses are earned.
The most important lesson is to always confirm which currency is the base before placing a trade. That single check prevents the common mistake of taking the opposite position to the one intended, and it makes position sizing, risk calculation and analysis far more reliable. With the base and quote relationship clear, every forex quote becomes a straightforward statement about the relative value of two currencies. Start trading the world’s major currency pairs with Skyriss at skyriss.com/get-started.
Celebrate Q4 with
Skyriss. Win an iPhone
Duo, iPhone 18 Pro, PS5
and more.
