Position Sizing: The Core Skill
Position sizing determines how many lots to trade based on your account size, risk percentage, and stop-loss distance. Formula: Position Size = (Account × Risk%) ÷ (Stop-Loss Pips × Pip Value). With a $5,000 account, 1% risk ($50), and a 25-pip stop: $50 ÷ (25 × $10) = 0.2 standard lots.
This formula ensures you never risk more than your planned amount regardless of how wide or tight your stop-loss is. It automatically reduces your position on wider stops and increases it on tighter stops — keeping risk constant. Master this formula.
Risk-to-Reward Ratios
Risk-to-Reward (R:R) ratio compares your potential loss to your potential profit. A 1:2 R:R means you risk $100 to make $200. With 1:2 R:R, you only need to win 34% of trades to break even. At 50% win rate with 1:2 R:R, you’re highly profitable.
Never take a trade with less than 1:1.5 R:R. Before entering, identify your stop-loss level and take-profit level. If the math doesn’t offer at least 1:1.5, skip the trade. This single rule eliminates most bad trades before they happen.
Maximum Drawdown and Recovery
Drawdown is the peak-to-trough decline in your account. If your account drops from $10,000 to $8,000, that’s a 20% drawdown. The critical insight: recovery is not symmetrical. A 20% loss requires a 25% gain to break even. A 50% loss requires a 100% gain. This is why capital preservation is everything.
Professional traders set a maximum daily and weekly drawdown limit. Example: if you lose 3% in a day, stop trading. If you lose 6% in a week, stop for the rest of the week. These circuit breakers prevent catastrophic losses during emotional or tilting periods.
Correlation Risk and Portfolio Management
Correlated pairs move together. EUR/USD and GBP/USD are positively correlated — if you’re long both, you’re essentially doubling your risk on a single theme (weak USD). If USD strengthens, both trades lose simultaneously. Count correlated positions as a single risk.
Diversify your exposure. If you’re long EUR/USD, don’t also go long GBP/USD and AUD/USD — you’d have 3x risk on USD weakness. Instead, trade uncorrelated pairs or take opposing positions to hedge. Use the forex correlation matrix (available in your calculators) to check before opening multiple positions.