Every day, more than $7 trillion changes hands in the foreign exchange market. That makes it the largest and most liquid financial market on earth, dwarfing equities and bonds combined. Yet most retail traders start with a vague idea of “buying and selling currencies” and fill in the gaps as they go, often expensively. This post explains how forex actually works, what it costs, and what you need in place before risking a single pound.
What Forex Is and Who Trades It
Forex, short for foreign exchange, is the global market where currencies are bought and sold against one another. Unlike a stock exchange, there is no central venue. Trading happens over-the-counter, between banks, brokers, institutions, and retail traders connected electronically around the world.
The participants span a wide range. Central banks intervene to manage their currencies. Commercial banks trade on behalf of corporate clients and for their own books. Multinational corporations convert revenues and hedge exposure. Retail traders, the audience this post is aimed at, make up a small but growing slice of daily volume. Understanding who else is in the market matters, because institutions move prices in ways that can quickly invalidate a retail position.
Currency Pairs, Quotes, and How Trades Work
Every forex trade involves two currencies. In EUR/USD, the euro is the base currency and the US dollar is the quote currency. The price tells you how many dollars one euro buys. If EUR/USD is 1.0850, one euro costs $1.0850. Going long means buying the base currency; going short means selling it.
Pairs are grouped broadly as majors (EUR/USD, GBP/USD, USD/JPY), minors (EUR/GBP, AUD/JPY), and exotics (USD/TRY, EUR/ZAR). Majors carry the tightest spreads and deepest liquidity. Exotics can move sharply on thin volume.
Trade sizes are measured in lots. 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. Price movement is measured in pips. For most pairs, one pip is 0.0001. For JPY pairs, one pip is 0.01.
Worked pip example. Suppose you buy GBP/USD at 1.2700 and it rises to 1.2750. That is a move of 50 pips. You traded one mini lot (10,000 units). Pip value formula: pip size multiplied by lot size. So 0.0001 x 10,000 = $1.00 per pip. Your profit in USD: 50 x $1.00 = $50.00. To convert to GBP, divide by the GBP/USD rate: $50.00 / 1.2750 = approximately £39.22. The same 50-pip move on a standard lot (100,000 units) would produce $500 or roughly £392. Position size matters enormously.
The Real Cost of a Forex Trade
Most beginners focus on direction and ignore costs. That is a mistake, because costs erode edge before a trade even begins.
The primary cost is the bid-ask spread. Your broker quotes two prices: the bid (what you can sell at) and the ask (what you can buy at). The ask is always higher. If EUR/USD is quoted 1.08490 / 1.08502, the spread is 1.2 pips. You start any long trade already 1.2 pips behind. The broker keeps this spread as compensation for executing your order. There is no separate commission in most retail spread-only accounts, but the spread is the cost, and it varies by pair, broker, and time of day.
The second cost is the overnight swap charge. Forex trades are technically spot transactions that roll over each day you hold them open. The rollover reflects the interest rate differential between the two currencies. Hold a GBP/USD long overnight when UK rates are lower than US rates, and you pay to hold that position. Swap rates compound quickly across weeks. Many beginners ignore this entirely, then wonder why their account drifts lower on a trade that has barely moved.
Leverage, Risk, and the Mistakes That Hurt Beginners
Retail forex accounts in the UK are capped by FCA rules at 30:1 leverage on major pairs. At 30:1, a £1,000 deposit can control a £30,000 position. The margin required is the position notional divided by the leverage ratio: £30,000 / 30 = £1,000. That sounds appealing until price moves against you.
A practical risk framework keeps losses manageable. Most professional traders risk no more than 1 to 2 percent of their account per trade. On a £5,000 account, that is £50 to £100 maximum loss per position. Set your stop-loss first, then calculate the position size that makes the stop equal your risk amount. Do not set position size first and worry about the stop later.
Common beginner mistakes are predictable. Over-leveraging is the most damaging, turning a minor adverse move into a margin call. Trading without a stop-loss is second. Ignoring swap costs on positions held for days is third. All three are avoidable with basic preparation.
Sessions, Price Drivers, and Choosing a Regulated Broker
Forex trades 24 hours a day, five days a week. For UK traders, the most important window is the London and New York overlap, which runs from 13:00 to 17:00 GMT in winter (12:00 to 16:00 BST in summer, as US clocks shift). Liquidity peaks here. Spreads narrow. Major US data releases such as Non-Farm Payrolls land at 08:30 ET, which is 13:30 GMT in winter or 12:30 BST in summer. Volatility spikes around these releases, which creates both opportunity and risk.
Prices are driven by interest rate decisions, central bank guidance, inflation data, and geopolitical events. Watching scheduled economic releases on a quality economic calendar is non-negotiable.
Broker selection is straightforward if you apply consistent criteria. Confirm FCA authorisation on the FCA register before opening an account. Check that the broker publishes its typical spreads by pair, not just headline “from 0.0 pips” marketing. Look for negative balance protection (required for UK retail clients) and clear swap rate disclosure. Execution speed matters on fast markets, so read independent reviews that specifically test slippage, not just interface design.
Start with a demo account. Trade it seriously, with the same lot sizes and risk rules you intend to use live. A month of disciplined demo practice will expose gaps in your process before real capital is at stake, and that is the most valuable thing you can do before your first live trade.
Risk warning: Trading forex and CFDs carries a high risk of loss and may not be suitable for all investors. You should never trade with money you cannot afford to lose. Past performance is not a reliable indicator of future results. This article is for educational purposes only and does not constitute financial, investment, or trading advice. If you are unsure, seek advice from an independent, suitably qualified financial adviser.
[…] profit and loss, especially on less familiar pairs. If you are still building your foundations, What Is Forex Currency Trading? A Beginner’s Guide is a solid starting point before going […]