Forex Trading Explained

Forex - shorthand for foreign exchange - is the global market for trading one currency against another. It dwarfs every other market on earth: roughly $7.5 trillion changes hands every trading day, more than the combined daily turnover of every stock exchange in the world. And unlike stocks, there is no central exchange. Forex is a decentralized, 24-hour, five-day-a-week network of banks, brokers, institutions, and retail traders wired together electronically. This lesson covers how forex actually works - pairs, pips, lots, leverageLeverageControlling a larger position than your capital alone would allow. 2× leverage means a 1% move produces 2% P&L.Read in glossary →, spreads, the four global sessions, and the one mechanic most beginner guides skip: rollover, the daily interest charge (or credit) that quietly makes or breaks multi-day positions.

What is forex - the one-sentence version

Forex is trading one currency for another at an agreed rate, with the goal of profiting from the rate changing. That's it. When you exchange dollars for euros on holiday, you just made an FX trade - at a brutal markup. When a hedge fund shorts the yen against the dollar ahead of a Bank of Japan meeting, same trade, better pricing, much bigger size.

What makes forex different from every other market:

• No central exchange. Quotes come from a web of banks and liquidity providers. The "market price" at any moment is a negotiated consensus, not a tape.
• 24/5 hours. Opens Sunday 5pm NY time, closes Friday 5pm. Never sleeps in between.
• Everything is a pair. You are never just "buying the euro" - you are buying the euro and selling something else. Typically the dollar.
• Leverage is the norm, not the exception. Retail FX accounts routinely offerAskThe lowest price a seller is currently willing to accept. When you buy with a market order, you buy at the ask.Read in glossary → 30:1, 50:1, 100:1, even 500:1 leverage (depending on jurisdiction). This is a feature and a weapon.

Currency pairs - base, quote, and what a quote actually means

Every forex quote is expressed as a pair. The format never changes:

So EUR/USD = 1.0850 means 1 euro costs 1.0850 US dollars. If you buy EUR/USD, you are buying euros and paying with dollars. If you sell EUR/USD, you are selling euros and receiving dollars.

The three tiers of pairs

FX pairs fall into three buckets, each with its own liquidity, spreadSpreadThe difference between the best ask and best bid. Effectively the round-trip cost paid to market makers on every trade.Read in glossary →, and volatility profile.

A small but useful nuance: JPY pairs are quoted differently. Because the yen trades at roughly 150 per dollar, a pair like USD/JPY = 150.25 uses two decimal places rather than four. This changes how pips are counted (more below).

Pips and pipettes - the atomic unit of FX

A pipPipIn forex, the smallest standard price move. Typically 0.0001 for most pairs; 0.01 for JPY pairs.Read in glossary → (percentage in point) is the smallest standardized price increment for a forex pair.

• For most pairs: 1 pip = 0.0001 (the fourth decimal place).
• For JPY pairs: 1 pip = 0.01 (the second decimal place).
• A pipette (or "fractional pip") is one-tenth of a pip - the fifth decimal place on most pairs, the third on JPY pairs. Modern brokers quote pipettes; older platforms stop at the pip.

If EUR/USD moves from 1.0850 to 1.0853, that's a 3-pip move. If USD/JPY moves from 150.25 to 150.40, that's a 15-pip move.

For a standard lotLotA standardized unit of currency in forex. Standard lot = 100,000 units, mini = 10,000, micro = 1,000.Read in glossary → (100,000 units) of EUR/USD: pip value = 0.0001 × 100,000 = $10 per pip. For a mini lot: $1 per pip. For a micro lot: $0.10 per pip. This is the single most useful back-of-envelope calculation in FX. Memorize it.

Lot sizes - how much currency you are actually moving

Forex positions are expressed in lots, not shares or contracts.

A trader with a $2,000 account opening a single standard lot of EUR/USD is controlling $108,500 worth of euros (at 1.0850). That is a 54:1 effective leverage ratio. Even a 20-pip adverse move wipes 10% of the account. This is where most retail FX accounts die.

Leverage - the feature that makes FX both accessible and lethal

Forex brokers offer leverage that would be unthinkable in equities. That's not a conspiracy; it's a consequence of the market's tiny daily ranges (most majors move 0.3 - 0.8% in a day) and enormous liquidity.

Regulatory leverage caps - not all brokers are equal

Retail leverage is regulated differently around the world:

Offshore 500:1 brokers are not automatically scams, but they are where beginners with gambling tendencies go to die quickly. The math is unforgiving: at 500:1, a 0.2% move against you is a 100% loss.

Bid, ask, and spread - the cost of doing business

Every FX pair has two prices at all times:

• The bidBidThe highest price a buyer is currently willing to pay. When you sell with a market order, you sell at the bid.Read in glossary → - the price the market will buy from you at (what you receive when selling).
• The ask (or offer) - the price the market will sell to you at (what you pay when buying).
• The spread - ask minus bid, expressed in pips. This is the broker's / market maker's cut.

If EUR/USD is quoted 1.08502 / 1.08508, the spread is 0.6 pips. On a micro lot, the cost of that round-trip (buy, then sell) is $0.06. On a standard lot, $6. Trivial per trade; material across hundreds of trades.

Fixed vs variable spreads

Most regulated ECN/STP brokers offer variable spreads. Most market-maker brokers offer fixed. Neither is strictly better - just different failure modes.

The four trading sessions - and why the overlap is sacred

Forex trades 24 hours, but liquidity is not uniform. It ebbs and flows with the world's financial capitals. There are four overlapping sessions:

The London / New York overlap - 8am to noon New York time - is the single highest-liquidity window of the entire week. Spreads are tightest, volume is deepest, and the big directional moves happen here. If you can only trade four hours a day, these are the four.

Going long vs going short - mechanics

Every FX trade is simultaneously a long and a short. You can't buy one currency without selling another. Still, traders think in terms of the pair's direction:

• Long EUR/USD = expect euro to strengthen vs. dollar. Buy at ask, sell later at a higher bid, keep the pip difference.
• Short EUR/USD = expect euro to weaken vs. dollar. Sell at bid, buy back later at a lower ask, keep the pip difference.

There is no borrowing-shares-to-short mechanic as there is in equities. FX trades as CFDs or spot contracts at retail brokers, so shortingShort sellingBorrowing shares to sell, with the intent to buy them back lower. Profits when price falls. Losses theoretically unlimited as price rises.Read in glossary → is mechanically identical to going long - click the "sell" button instead of "buy."

Rollover (swap) - the overnight interest that most guides skip

Here is the mechanic that catches out everyone who learns FX from a YouTube video: if you hold a position past 5pm New York time, you pay or receive interest based on the interest-rate differential between the two currencies. This is called rollover or swap.

A worked example

You buy 1 standard lot (100,000) of AUD/JPY. The RBA policy rate is 4.35%. The BOJ policy rate is 0.25%. You are long a high-yielding currency (AUD) and short a low-yielding one (JPY). Each night you receive swap.

• Rate differential: 4.35% − 0.25% = 4.10%.
• Daily swap: 4.10% ÷ 365 × $100,000 ≈ $11.23 per day (before broker markup; in practice more like $4 - $6).

Reverse the trade - short AUD/JPY - and you pay that spread every night. Hold for 30 days and the swap can dwarf your actual price move.

Triple swap Wednesday

FX settles T+2. A position held through Wednesday night settles on Friday, which means weekend financing (Saturday + Sunday) is also charged - so Wednesday's swap is 3× a normal day. Price this in, or close before the Wednesday 5pm cutoff.

What moves currency prices - the four big drivers

Unlike stocks (which track a single company), currencies reflect the relative health of two entire economies. Four forces do most of the work:

1. Central bank policy. Interest-rate decisions and guidance from the Fed, ECB, BOE, BOJ, RBA, SNB, RBNZ, and BOC. Higher (or rising) rates typically strengthen a currency. The Fed is the 800-pound gorilla - any pair with USD on one side reacts to Fed meetings.
2. Macro data releases. Non-farm payrolls (NFP), CPI, GDP, PMIs, retail sales. Expected numbers are priced in; surprises move markets violently, often in the first 200 milliseconds.
3. Risk sentiment (risk-on vs risk-off). In risk-on moments, higher-yielding / commodity currencies (AUD, NZD, CAD) strengthen against defensive ones (USD, CHF, JPY). In risk-off (crises, war, sudden equity selloffs), the flow reverses.
4. Geopolitics and trade flows. Elections, sanctions, oil shocks (CAD is sensitive to oil; NOK is sensitive to oil), and debt-ceiling dramas. Harder to model but real.

Major pairs at a glance

A full trade example

Walk through the math on a conservative retail trade end-to-end.

• Account: $5,000 (USD)
• Risk per trade: 1% = $50
• Pair: EUR/USD at 1.0850 bid / 1.0851 ask (spread = 1 pip)
• Setup: long 1.0851, stop 1.0831 (20 pips risk), target 1.0891 (40 pips = 2:1 R/RReward-to-riskDistance to target ÷ distance to stop. Minimum workable setups are typically 2:1 or better.Read in glossary →)

Position size: $50 risk ÷ $1/pip (mini lot) ÷ 20 pips = 2.5 mini lots = 25,000 units of EUR/USD.

Notional size: 25,000 × 1.0851 = $27,128. Effective leverage = 27,128 ÷ 5,000 ≈ 5.4:1. Comfortably inside any regulatory cap.

Required marginMarginBorrowed capital used to increase position size. Amplifies both gains and losses proportionally.Read in glossary → at 30:1: 27,128 ÷ 30 ≈ $905. The remaining $4,095 is buffer.

If the trade wins: +40 pips × $2.5/pip = +$100 (+2% account). If the trade loses: −20 pips × $2.5/pip = −$50 (−1% account). Cost to enter: spread × position = 1 × $2.5 ≈ $2.50 (already baked into the fill).

Do this trade 100 times with a 50% win rate and you're +50% on the account before slippage and swap. Do this trade 100 times with a 40% win rate and you're still +20%. That's the power of positive expectancyExpectancyExpected R-multiple per trade: (WinRate × AvgWinR) − (LossRate × AvgLossR). Positive = edge. Negative = bleed.Read in glossary → plus strict sizing.

Common questions about forex

Is forex rigged against retail traders? The market itself isn't rigged - liquidity is real and quotes come from banks - but retail economics are hostile. Spreads, swap, slippage, and unfavorable quote caching at some market-maker brokers compound against you. Pick a regulated ECN/STP broker and those costs become tolerable.

Can I trade forex with $100? Technically yes, with a micro or nano account. Practically no - 1% of $100 is a dollar, which can't meaningfully size around a 20-pip stop without cartoonish leverage. Most serious retail FX traders consider $2,000 - $5,000 the realistic floor.

What's the difference between forex and a CFD? Retail forex at most brokers is a CFD (contract for difference). You don't own the currency - you own a contract whose P&L tracks the pair. True spot FX is an interbank product. In the US, retail FX is structured differently and not as CFDs.

Which pair is best for beginners? EUR/USD. Tightest spreads, deepest liquidity, cleanest technical behavior, most written analysis available. Start there, branch out later.

Do I pay taxes on forex? Depends on jurisdiction. In the US, spot FX defaults to IRC Section 988 (ordinary income) but can be elected into 1256 contract treatment (60/40 long-term/short-term). Consult a tax pro - do not take internet advice on this.

Math cheatsheet

Key takeaways

• Forex is the largest, most liquid, most leveraged market on earth - and the most unforgiving to the under-capitalized.
• Every trade is a pair: you're always long one currency and short another.
• Pips and lots define sizing; memorize that a standard lot on most majors is ~$10/pip.
• Leverage amplifies results symmetrically. Offshore 500:1 isn't a feature - it's a speedrun to zero.
• Spreads and swap are the real costs. Strategies that trade frequently or hold overnight need to price them in.
• The London-New York overlap (8am - 12pm NY) is where real liquidity and real moves live.
• Central bank policy and macro data do 80% of the long-term driving. Know the calendar.
• Sizing from risk, not from a lot-count instinct, is what separates survivors from casualties.
• Rollover / swap silently compounds on every overnight trade - check it before you hold anything.
• EUR/USD during the London-NY overlap, 1% risk per trade, 2:1 minimum reward-to-risk - that's the default curriculum for the first thousand trades.

Up next: Risk Management - position sizingPosition sizingThe formula that turns risk dollars and stop distance into shares/contracts/lots. Size = Risk $ ÷ Stop distance.Read in glossary →, stop placement, expectancy math, and the handful of rules that let you survive a losing streak you will absolutely have.