About the author: Alex Mercer has traded currencies for over 10 years, from EUR/USD to illiquid emerging-market exotics. He investigates broker pricing and execution costs and writes to show traders how pairs really behave, beyond the textbook definitions.
You can't buy "the euro" in forex. You can only buy it against something else. That's the first thing to grasp when you look for currency pairs explained in plain English: every forex trade is a bet on one currency versus another, never on a single currency in isolation.
Most guides stop at "base currency first, quote currency second." That's correct, but it won't help you understand why GBP/JPY costs more to trade than EUR/USD, or why four trades on four different pairs can blow up together.
This guide covers how to read a pair, what happens when you buy or sell, the three pair families, how crosses are priced, and the correlation trap that caught me early in my career.
Table of Contents
- How to Read a Currency Pair: Base vs Quote
- Buying vs Selling a Pair: What Happens to Your P&L
- Bid, Ask, and Spread: The Price You Really Pay
- Majors, Minors, and Exotics: The Three Pair Families
- Why the US Dollar Sits at the Centre
- Pair Personalities: Drivers, Nicknames, and Sessions
- Correlations: The Diversification Illusion
- How to Choose the Right Pairs for You
How to Read a Currency Pair: Base vs Quote
Every currency pair has two parts, written with three-letter ISO codes:
- Base currency: the first currency. It always equals one unit.
- Quote currency: the second currency. It shows how much of it you need to buy one unit of the base.
Take EUR/USD = 1.0850. One euro costs 1.0850 US dollars. Euro is the base; dollar is the quote.
What a Rising or Falling Price Means
If EUR/USD rises from 1.0850 to 1.0950, the euro has strengthened against the dollar. Or, viewed from the other side, the dollar has weakened against the euro. Both statements are true at once.
If EUR/USD falls to 1.0750, the reverse applies. The euro buys fewer dollars.
Why the Order Isn't Random
Pair order follows long-standing market convention, not alphabetical logic. Broadly, the euro comes first in most of its pairs, followed by sterling, then the Australian and New Zealand dollars, then the US dollar. That's why you'll see EUR/USD and GBP/USD, but USD/JPY and USD/CAD.
This matters more than it seems. On USD/JPY, a rising price means the dollar is strengthening. On EUR/USD, a rising price means the dollar is weakening. Beginners who trade "the dollar" across several pairs often get the direction backwards on at least one of them.
How Pairs Are Quoted
Most pairs quote to four decimal places, plus a fractional fifth digit on modern platforms. Yen pairs quote to two decimals, plus a fractional third. The smallest standard unit of movement is the pip, covered in depth in our pip guide (update link once published).
Investopedia's currency pair reference provides a good secondary definition if you want another angle (Investopedia, n.d.).
Takeaway: The base currency is always one unit, and the price tells you how much quote currency that one unit costs.
Buying vs Selling a Pair: What Happens to Your P&L
When you trade a pair, you're always doing two things at once. That's the mechanic most competitor guides describe in words but never in numbers.
Going Long (Buying)
Buying EUR/USD means buying euros and selling dollars at the same time. You profit if the euro strengthens against the dollar.
Going Short (Selling)
Selling EUR/USD means selling euros and buying dollars. You profit if the euro weakens against the dollar.
There's no "short-selling restriction" in spot forex. Selling a pair is as routine as buying one, because you're simply holding the other currency.
Worked Example: A Long EUR/USD Trade
- You buy 10,000 euros' worth of EUR/USD (one mini lot) at 1.0850.
- EUR/USD rises to 1.0900, a move of 50 pips.
- On a mini lot, each pip is worth $1, so your profit is 50 × $1 = $50.
- If price had fallen to 1.0800 instead, you'd have lost $50.
Worked Example: A Short USD/JPY Trade
- You sell 10,000 dollars' worth of USD/JPY at 150.00.
- USD/JPY falls to 149.00, a move of 100 pips.
- Each pip is worth ¥100 on this size; 100 pips × ¥100 = ¥10,000.
- Converted at 149.00, that's roughly $67 profit.
Notice how the yen example ends with a conversion step. Your profit is always earned in the quote currency first, then converted into your account currency. That's why the same pip move is worth different amounts on different pairs.
The US Federal Reserve publishes reference exchange rates that are useful for checking conversions like these (Federal Reserve, n.d.).
Takeaway: Buying a pair means buying the base and selling the quote, and your profit or loss is calculated in the quote currency before conversion.
Bid, Ask, and Spread: The Price You Really Pay
Every pair has two prices, not one. This is where the real cost of trading hides.
The Two Prices
- Bid: the price at which you can sell the pair.
- Ask (or offer): the price at which you can buy the pair.
- Spread: the difference between them, measured in pips.
If EUR/USD shows 1.08500 / 1.08508, the spread is 0.8 pips. You buy at 1.08508 and could immediately sell at 1.08500, so every trade starts slightly negative.
How Spreads Vary by Pair
Spreads reflect liquidity. The more a pair trades, the tighter its spread. Typical retail spreads on a standard account look something like this (illustrative, and they vary by broker and time of day):
| Pair type | Example | Typical spread range |
|---|---|---|
| Major | EUR/USD | ~0.1–1.2 pips |
| Minor/cross | GBP/JPY | ~1.5–4 pips |
| Exotic | USD/TRY | Often tens of pips or more |
Why Spreads Widen
- Session changes. Spreads often widen at the daily rollover when liquidity thins.
- News releases. Major data, such as US payrolls, can widen spreads sharply for seconds or minutes.
- Weekends and holidays. Monday opens and holiday sessions can carry wider pricing.
- Market stress. During sudden shocks, liquidity can vanish across all pairs.
Exotic Costs Go Beyond the Spread
Exotic pairs often carry large swap rates (overnight financing) because of wide interest rate gaps between the two countries. A trade can look profitable on price and still lose money after a few weeks of negative swaps.
Regulators also treat non-major pairs as riskier. ESMA's retail rules cap leverage at 30:1 for majors but 20:1 for non-major pairs (ESMA, 2018).
Takeaway: The spread is your entry cost on every trade, and it grows as you move from majors to crosses to exotics.
Majors, Minors, and Exotics: The Three Pair Families
Now that you have currency pairs explained at the mechanical level, let's sort them into families. Each family behaves, and costs, very differently.
Major Pairs
Majors pair the US dollar with another heavily traded currency. Most retail brokers list seven:
| Pair | Common nickname |
|---|---|
| EUR/USD | Fiber |
| USD/JPY | Gopher (less common) |
| GBP/USD | Cable |
| USD/CHF | Swissie |
| AUD/USD | Aussie |
| USD/CAD | Loonie |
| NZD/USD | Kiwi |
Majors offer the deepest liquidity, tightest spreads, and the most analysis coverage. They're where nearly every beginner should start.
Minor Pairs (Crosses)
Crosses pair two major currencies without the US dollar. Popular examples include EUR/GBP, EUR/JPY, GBP/JPY, and AUD/JPY. Some brokers call all crosses "minors"; others reserve the term for the most liquid ones.
Crosses let you express a view on two economies without dollar noise. If you think the euro will outperform sterling, EUR/GBP isolates that idea.
Exotic Pairs
Exotics pair a major currency with an emerging-market or smaller currency. Examples: USD/TRY, USD/ZAR, USD/MXN, EUR/PLN.
- Pros: strong trends, high interest rate differentials, distinct macro stories.
- Cons: wide spreads, thinner liquidity, sudden gaps, government intervention, and expensive swaps.
A Note on Classification
These labels are conventions, not regulations. Saxo makes the same point: the "seven majors" list is a market habit rather than a hard rule (Saxo, n.d.). USD/CNY now trades more than several "majors," yet most retail platforms still list it as exotic.
Takeaway: Majors are cheapest and most liquid, crosses remove the dollar, and exotics trade higher reward potential for much higher cost and gap risk.
Why the US Dollar Sits at the Centre
Here's the data the top-ranking pages leave out. It explains why majors are majors.
What the 2025 BIS Survey Shows
The Bank for International Settlements surveys global FX trading every three years. Its April 2025 survey found:
- Total turnover reached $9.6 trillion per day, up 28% from 2022 (BIS, 2025a).
- The US dollar was on one side of 89% of all trades.
- The euro followed at 28.9%, the yen at 16.8%, and sterling at 10.2%.
- All of the top 10 most traded pairs involved the US dollar, and USD/CNY rose to 8.1% of global turnover (BIS, 2025b).
(Shares add up to 200% because every trade involves two currencies.)
The Dollar as a "Vehicle Currency"
Because the dollar is so liquid, dealers often route trades through it. Want to swap Polish zloty for Thai baht? There's little direct market for PLN/THB, so the trade often runs PLN → USD → THB.
How Crosses Are Priced
That same logic explains cross pricing. Many cross rates are derived from the two USD pairs behind them:
- EUR/JPY = EUR/USD × USD/JPY. At 1.0850 and 150.00, that's 162.75.
- EUR/GBP = EUR/USD ÷ GBP/USD. At 1.0850 and 1.2700, that's about 0.8543.
Because a cross can reflect the spreads of both underlying pairs, it often costs more to trade. That's a key reason GBP/JPY spreads are wider than either GBP/USD or USD/JPY on their own.
Why This Matters for You
If the dollar moves sharply, as it does after a surprise Federal Reserve decision, almost every major pair reacts at once. Understanding the dollar's central role is the first step toward managing correlation risk.
Takeaway: The US dollar sits on 89% of global trades, which makes USD pairs the cheapest to trade and drives how cross rates are priced.
Pair Personalities: Drivers, Nicknames, and Sessions
Every pair has a personality shaped by the economies behind it. Learn those personalities and charts start to make more sense.
Key Drivers by Pair
- EUR/USD: interest-rate expectations at the ECB and Federal Reserve; eurozone and US data.
- USD/JPY: the gap between US and Japanese bond yields; Bank of Japan policy shifts; intervention risk.
- GBP/USD: Bank of England decisions; UK inflation; often livelier than EUR/USD.
- AUD/USD and NZD/USD: commodity prices, Chinese growth, and global risk appetite.
- USD/CAD: oil prices, given Canada's energy exports.
- USD/CHF: safe-haven demand during market stress.
When Each Pair Moves
Forex trades 24 hours a day on weekdays, but activity isn't equal around the clock.
- Asian session (Tokyo, Sydney): yen and Australian/New Zealand dollar pairs are most active; EUR/USD often ranges quietly.
- London session: the busiest single centre; euro, sterling, and Swiss franc pairs come alive.
- London–New York overlap: roughly 13:00 to 17:00 GMT, typically the most liquid window for USD majors.
- Late New York: liquidity fades and spreads may widen into the daily rollover.
The Reserve Bank of Australia's summary of the 2025 BIS survey shows how concentrated trading is by location and pair, with AUD/USD making up over 41% of Australian FX turnover (RBA, 2025).
What the Pros Say
Kathy Lien, Managing Director of FX Strategy at BK Asset Management, has described her approach this way: "I trade the EUR/USD a lot, but it is not the only one that I trade. I trade almost all the major currency pairs" (Technical Analysis of Stocks & Commodities, 2012). Even seasoned specialists anchor on the majors.
If you trade part-time around a job, our beginner's guide covers how to match sessions to your schedule.
Takeaway: Each pair reacts to its own economic drivers and is most active in specific sessions, so trade pairs when their home markets are open.
Correlations: The Diversification Illusion
This is the gap that cost me the most money, and the one I see beginners repeat every month.
What Correlation Means
Correlation measures how closely two pairs move together. Because so many pairs share the US dollar, many are tightly linked:
- EUR/USD and GBP/USD have historically tended to move in the same direction.
- EUR/USD and USD/CHF have historically tended to move in opposite directions.
- AUD/USD and NZD/USD often move closely together, driven by similar commodity and risk factors.
Correlations shift over time, so check them regularly rather than treating them as fixed.
My Own Case Study
In my second year of trading, I felt clever about "diversifying." Ahead of a US inflation release, I opened four positions, each risking 1% of my account:
- Long EUR/USD
- Long GBP/USD
- Long AUD/USD
- Short USD/CHF
Four pairs. Four "separate" trades. I told myself my total risk was spread out.
It wasn't. All four positions were the same bet: short the US dollar. The inflation number came in hot, the dollar jumped, and all four trades hit their stops within about 20 minutes. I lost close to 4% of my account on what was really one idea sized four times.
What I Do Differently Now
- I group trades by currency exposure, not by pair name, before opening anything.
- I cap total exposure to any single currency at the risk I'd accept on one trade, around 1% to 2%.
- I check a correlation table weekly, since relationships drift with central bank cycles.
- I treat crosses as a genuine diversifier when I want to express a view without dollar exposure.
The CFTC's warning applies directly here: forex "is not the place to put any money that you cannot afford to lose" (CFTC, n.d.). Hidden correlation is one of the fastest ways to lose that money.
Takeaway: Pairs that share a currency often move together, so measure risk by currency exposure rather than by the number of trades you hold.
How to Choose the Right Pairs for You
With currency pairs explained from definition to correlation, the final question is practical: which ones should you trade?
A Five-Step Selection Framework
- Start with your schedule. Choose pairs that are active when you can watch the screen. Evening traders in Asia might favour AUD/USD or USD/JPY; London-hours traders might favour EUR/USD or GBP/USD.
- Check the true cost. Compare average spread plus commission against your typical profit target. If costs eat more than 10% to 15% of your target, choose a cheaper pair.
- Match volatility to your stop size. A pair that moves 150 pips a day needs wider stops and smaller positions than one that moves 60.
- Limit your watchlist. Two to four pairs you know deeply beat fifteen you barely understand.
- Map your currency exposure. Make sure your watchlist doesn't quietly concentrate risk on one currency.
Sensible Starting Points
For most new traders, EUR/USD is the logical first pair: deep liquidity, low costs, and abundant analysis. Add one non-dollar cross, such as EUR/GBP or AUD/JPY, once you understand how it's priced.
Save exotics until you understand swaps, gap risk, and position sizing. Our guide on how forex trading works covers the mechanics behind those costs.
Strategy Fit Matters Too
Structure-based approaches, such as order block trading and ICT concepts, tend to work best on liquid majors where price respects levels more cleanly. Automated strategies need the same care; see what a decade of testing taught me about AI trading and bots.
The BIS data reinforces this: the deepest liquidity sits in USD pairs, and that's where pricing is most efficient for retail traders (BIS, 2025b).
Takeaway: Pick a small set of liquid pairs that fit your schedule, cost tolerance, and strategy, then learn their behaviour inside out.
Final Thoughts
Currency pairs explained properly come down to a few ideas. Every pair is a relative bet. The base is one unit, the quote shows its price. Spreads widen as liquidity falls. The US dollar sits at the centre of nearly everything. And correlations can turn "diversified" trades into one oversized position.
Master those ideas and you'll stop seeing a forex platform as a list of tickers. You'll see it as a map of linked economies, which is exactly how professionals read it.
Author Bio
Alex Mercer is an investigative forex strategist with more than a decade of live trading experience across major, cross, and exotic currency pairs. His work focuses on broker transparency, execution costs, and practical risk management for retail traders. He writes for 5dollarsimpact.com and believes good trading education should show the maths behind the marketing.
Fact-Checking Note
This article was fact-checked on 15 October 2026. Turnover and currency-share data come from the BIS Triennial Central Bank Survey (September 2025 release and statistical annex) and the Reserve Bank of Australia's summary tables. Leverage limits come from ESMA's March 2018 press release. The expert quote comes from Kathy Lien's 2012 interview in Technical Analysis of Stocks & Commodities. Exchange rates and spread ranges in examples are illustrative and will differ from live prices.
Risk Disclaimer
Trading foreign exchange and CFDs on margin carries a high level of risk and may not be suitable for all investors. Leverage can work against you as well as for you, and you may lose some or all of your invested capital. This article is for educational purposes only and does not constitute financial or investment advice. Seek independent advice if you have any doubts.
References
Bank for International Settlements. (2025a, September 30). Global FX trading hits $9.6 trillion per day in April 2025 and OTC interest rate derivatives surge to $7.9 trillion – Triennial Survey [Press release]. https://www.bis.org/press/p250930.htm
Bank for International Settlements. (2025b). OTC foreign exchange turnover in April 2025 [Statistical release]. https://www.bis.org/statistics/rpfx25_fx.pdf
Board of Governors of the Federal Reserve System. (n.d.). Foreign exchange rates – H.10. https://www.federalreserve.gov/releases/h10/current/
Commodity Futures Trading Commission. (n.d.). Fraud advisory: Foreign currency (forex) fraud. https://www.cftc.gov/LearnAndProtect/AdvisoriesAndArticles/fraudadv_forex.html
European Securities and Markets Authority. (2018, March 27). ESMA agrees to prohibit binary options and restrict CFDs to protect retail investors [Press release]. https://www.esma.europa.eu/node/84933
Gopalakrishnan, J., & Faber, B. (2012, September). Interview: Kathy Lien of BKForex.com. Technical Analysis of Stocks & Commodities, 30(9), 46–50. https://www.traders.com/Documentation/FEEDbk_docs/2012/09/Interview.html
Investopedia. (n.d.). Currency pair: Definition, uses, and examples. https://www.investopedia.com/terms/c/currencypair.asp
Reserve Bank of Australia. (2025). 2025 BIS Triennial Survey results – Australia [Media release tables]. https://www.rba.gov.au/media-releases/2025/mr-25-28-tables.html
Saxo. (n.d.). The 7 major forex pairs you need to know before you start trading. https://www.home.saxo/learn/guides/forex/the-major-forex-pairs
PART 4: Internal Link Suggestions (5dollarsimpact.com)
| Anchor text | Target URL | Placement |
|---|---|---|
| how forex trading works | https://www.5dollarsimpact.com/2026/10/how-does-forex-trading-work-mechanics.html | Section 8 (included) |
| beginner's guide | https://www.5dollarsimpact.com/2026/10/forex-trading-for-beginners-honest-2026.html | Section 6 (included) |
| order block trading | https://www.5dollarsimpact.com/2026/01/mastering-order-block-trading-strategy.html | Section 8 (included) |
| ICT concepts | https://www.5dollarsimpact.com/2026/01/ict-forex-concepts-explained-traders.html | Section 8 (included) |
| AI trading and bots | https://www.5dollarsimpact.com/2026/01/ai-trading-what-10-years-trading-taught.html | Section 8 (included) |
| pip guide | (your "What is a pip in forex" URL once published) | Section 1 (placeholder link to homepage for now) |
| leverage guide | (your "What is leverage in forex" URL once published) | Section 3, next to the ESMA leverage caps |
PART 5: FAQ (for FAQPage Schema)
1. What is a currency pair? A currency pair quotes the value of one currency against another. In EUR/USD = 1.0850, one euro (the base) costs 1.0850 US dollars (the quote).
2. What are the major currency pairs? Most brokers list seven: EUR/USD, USD/JPY, GBP/USD, USD/CHF, AUD/USD, USD/CAD, and NZD/USD. All include the US dollar and offer the deepest liquidity.
3. What is the difference between a cross pair and an exotic pair? A cross pairs two major currencies without the US dollar, such as EUR/GBP. An exotic pairs a major currency with an emerging-market currency, such as USD/TRY, and usually costs more to trade.
4. Which currency pair is best for beginners? EUR/USD is the most common starting point because it combines deep liquidity, tight spreads, and extensive market analysis.
5. Why do currency pairs move together? Many pairs share a currency, usually the US dollar. When the dollar moves sharply, every pair containing it tends to react, creating correlations between them.
PART 6: TL;DR Summary
- Every forex trade is one currency against another; the base equals one unit, and the quote shows its price.
- Buying a pair buys the base and sells the quote; P&L is calculated in the quote currency first.
- The spread (ask minus bid) is your entry cost and widens from majors to crosses to exotics.
- Majors include USD; crosses exclude it; exotics add emerging-market currencies.
- The US dollar sits on 89% of global trades (BIS 2025), and all of the top 10 pairs include it.
- Crosses are often derived from two USD pairs, which can widen their spreads.
- Pairs sharing a currency are correlated; measure risk by currency exposure.
- Choose a small watchlist matched to your schedule, costs, and strategy.