BEYOND THE CHART · CHAPTER 01
Risk, Position Sizing & Capital Preservation
The learner can define risk per trade, calculate position size from a stop distance, compare reward to risk, understand drawdowns and losing streaks, consider portfolio exposure, explain why capital preservation matters, use predetermined risk rules, and maintain a risk journal without treating any figure as a personal recommendation.
Risk per trade is the cost of being wrong
Define risk per trade clearly.
Risk per trade is the planned loss used to size and evaluate a position if the intended exit occurs near the chosen invalidation level. It is not the total value of the position. Actual loss can exceed the plan because of gaps, slippage, fees or an order that does not execute as expected.
Position size follows risk, not confidence
Calculate position size from risk and stop distance.
A simplified share-size calculation is: (Account equity × chosen risk %) ÷ absolute difference between planned entry and intended exit level. The result must be rounded down and adjusted for fees, slippage, gaps, instrument specifications and broker rules. It controls the planned arithmetic; it cannot guarantee the realised loss. Position size should not come from confidence.
Reward-to-risk compares potential gain with potential loss
Understand reward-to-risk ratio.
Reward-to-risk, often written as R:R, compares the planned gain to the planned loss. For example, risking $100 to make $200 is a 2:1 ratio. The ratio does not tell you the probability of success.
Drawdowns measure peak-to-trough loss
Define drawdown and recovery burden.
Drawdown is the decline from a peak in account equity to a later trough. It matters because larger losses require larger percentage gains to recover. A 10% loss needs an 11.1% gain, a 25% loss needs 33.3%, and a 50% loss needs 100%.
Losing streaks can happen with any realistic win rate
Understand the mathematics of losing streaks.
Even a method with a positive win rate can produce consecutive losses. Randomness and changing conditions make streaks possible. Risk per trade should be small enough to survive a normal losing streak without severe damage.
Portfolio exposure and correlation matter
Understand that individual risk limits may understate total risk.
Risk per trade is only one layer. If several positions are highly correlated, their losses may happen together. Portfolio exposure considers how much could be lost if multiple positions fail at the same time.
Capital preservation comes before return maximisation
Understand why survival matters.
Capital preservation means keeping the account able to continue trading after losses. A strategy with lower returns but smaller drawdowns may be more sustainable than one with high returns but a large risk of ruin. Survival is the first requirement.
Risk of ruin increases with oversized risk
Define risk of ruin simply.
Risk of ruin is the chance that losses reduce an account to a level where the trader cannot continue. Oversized positions and high correlation increase this risk. Even a positive-expectancy method can ruin an account if risk per trade is too large.
Predetermined stops make risk measurable
Place invalidation before entry.
An invalidation level is the price area where the original trade thesis no longer holds. A trader may use it to plan an exit and calculate size before entry. If a stop order is used, its trigger price is not a guaranteed execution price; gaps and fast markets can produce a materially different fill.
Journaling risk decisions
Record risk details separately from profit outcome.
A risk journal includes date, instrument, direction, entry, stop, position size, planned dollar risk, target, reward-to-risk ratio, outcome and a note. This separates process review from whether the trade happened to make money.
Predetermined decision rules reduce emotional override
Use rules made in a calm state.
Predetermined rules for entry, stop, position size and exit are created before the market becomes stressful. They help prevent revenge trading, impulsive size increases and emotional stop changes.
Theory boundaries and personal responsibility
State what this educational chapter does and does not provide.
This chapter provides frameworks for thinking about risk, position sizing and survival. It does not provide a recommended risk percentage, tell you how much to trade, or guarantee that any method will make money. Personal circumstances, regulations and risk tolerance vary.