The four lot sizes

Forex is traded in standardised blocks called lots. Each lot type represents a fixed number of units of the base currency. The standard lot — 100,000 units — was originally designed for institutional traders. Retail brokers later introduced mini, micro, and nano lots to make the market accessible to smaller accounts.

Lots vs leverage

Lots define the size of your trade. Leverage defines how much of your own capital is required to hold that size. A standard lot of EUR/USD has a notional value of around $110,000 at current prices. With 1:100 leverage, you only need $1,100 in margin to open it — but you're still exposed to the full $10-per-pip movement.

This is a critical distinction. High leverage lets you trade large lots with little capital, but your profit and loss is calculated on the full lot size, not the margin. A 50-pip loss on a standard lot is $500 regardless of how much leverage you used to open the position.

Fractional lot sizes

Most brokers allow fractional lots. You are not limited to 0.01, 0.10, or 1.00 — you can trade 0.03, 0.25, 1.50, and so on. This is important for precise position sizing: rather than rounding up to the nearest micro lot and accidentally over-risking, you can dial in the exact lot size that puts exactly your desired percentage at risk.

How lot size affects your psychology

Trading too large is one of the most common causes of emotional decision-making. When a single pip represents a meaningful fraction of your account, you will struggle to hold positions through normal price noise. Properly sized lots — where a losing trade is a minor inconvenience rather than a crisis — are what make it possible to execute your strategy without interference from fear or greed.

Why position sizing is the foundation of risk management

Most traders focus their energy on entry signals — finding the right setup, the right zone, the right pattern. But entries are only part of the equation. Two traders can take the exact same trade with the same entry and stop loss, and one will blow their account while the other compounds steadily. The difference is almost always position sizing.

Proper position sizing ensures that no single trade can significantly damage your account, regardless of how confident you feel about the setup. Without it, your results will be inconsistent even if your analysis is correct.

The core formula

Choosing your risk percentage

Fixed percentage vs fixed dollar risk

With fixed percentage, your position sizes naturally shrink during drawdowns (protecting the account) and grow during winning runs (compounding gains). With a fixed dollar amount, you might be risking $100 when your account is at $10,000 (1%) but still risking $100 when your account has dropped to $5,000 (now 2%) — without noticing the increased relative risk.

The role of stop loss placement

Your stop loss distance directly controls your lot size. A tighter stop = larger lot size for the same dollar risk. A wider stop = smaller lot size. This is a mathematical relationship, not a choice. Never move your stop closer to accommodate a larger lot size — the stop should always be placed at the technically correct level first, then the lot size calculated from that distance.

The four major sessions

The London/New York overlap — the highest value window

The overlap between the London and New York sessions — roughly 13:00 to 17:00 UTC — is the single most liquid period in the entire forex market. Both the world's two largest financial centres are active simultaneously, driving tight spreads, strong trends, and clean price action on the major pairs.

This is the window where supply and demand zones are most likely to react decisively. Institutional order flow is at its peak. If you can only trade one window per day, this is the one to prioritise.

The London open — where trends are born

The London open (08:00 UTC) is the most important single moment in the trading day for EUR and GBP pairs. As European institutional traders come online, they process overnight news and Asian price action, often establishing the directional bias that carries through the entire day.

The Asian session — ranging behaviour

Tokyo and Sydney hours (roughly 22:00 – 08:00 UTC) are characterised by lower volatility and ranging price action on the major pairs. For supply/demand zone traders, the Asian session can be useful for identifying base formations that subsequently break during London.

Times to avoid

The dead zone (17:00 – 22:00 UTC): After New York closes and before Sydney opens, volume drops sharply. Spreads widen and moves are erratic. Not a productive trading window for most strategies.

Major news releases: NFP, FOMC, CPI, and central bank press conferences generate extreme short-term volatility with wide spreads. Closing or avoiding positions in the 15 minutes either side of these events is sound risk management.

How the 24-hour forex market works

Unlike stock exchanges, forex has no central exchange and no fixed opening bell. It operates as an over-the-counter (OTC) market — a global network of banks, institutions, and brokers trading directly with each other. Trading is continuous from Sunday evening to Friday evening, following the business hours of financial centres as they open and close around the world.

Session open and close times

Session overlaps

Tokyo / London overlap (08:00 – 09:00 UTC)

A narrow one-hour window with moderate liquidity. EUR/JPY and GBP/JPY are most active here as European traders respond to positions established during the Asian session.

London / New York overlap (13:00 – 17:00 UTC)

The most important window in the forex trading day. Volume is at its highest, spreads are at their tightest, and the major pairs produce their most significant moves. This four-hour window accounts for a disproportionate share of total daily volume.

The weekly open and close

The forex market closes at approximately 22:00 UTC on Friday (New York close) and reopens at approximately 22:00 UTC on Sunday (Sydney open). Weekend gaps form in this window — if significant news breaks over the weekend, price opens at a different level on Sunday, skipping through any orders placed in between.

Public holidays and reduced liquidity days

When major financial centres observe public holidays — particularly US holidays like Thanksgiving, Christmas, and New Year — volume drops even during normally active session times. Trading on low-liquidity days carries higher risk of erratic price action and wider spreads.