Daniel ran a 68% win rate system for fourteen months. His entries were sharp, his analysis was sound, and his backtests were compelling. Then he put 40% of his account into a single crude oil trade because he was "confident." A gap-down open cost him $22,000 overnight. He never psychologically recovered, blew the account within six weeks, and quit trading entirely. The strategy wasn't broken — his position sizing was.

Every professional trader eventually arrives at the same realisation: the size of each trade matters more than whether it wins or loses. A string of losses at 1% risk is survivable. A string of losses at 20% risk is catastrophic. The maths are unforgiving. Drawdown recovery is not linear — lose 50% of your account and you need a 100% gain just to break even.

CONCEPTRisk a fixed percentage per trade — not a fixed dollar amount — so position size scales down automatically during drawdowns.
WARNINGRisking more than 2% per trade on a $50,000 account means five consecutive losses wipe out 10% of capital before you blink.
KEY IDEACompounding works both ways — consistent small losses compound into ruin just as reliably as consistent gains compound into wealth.

The fixed fractional method is the starting point most systematic traders use. On a $50,000 account risking 1% per trade, maximum risk per position is $500. If your stop-loss is 50 points and each point is worth $10, your position size is exactly 1 contract. The formula is straightforward: Position Size = (Account Balance × Risk %) ÷ (Stop Distance × Point Value). This scales automatically as your account grows or shrinks.

Drawdown vs Recovery Required 100% 75% 50% 25% 10% 25% 40% 50% 60% Loss Suffered Loss Recovery needed

The Kelly Criterion takes sizing further by incorporating your win rate and reward-to-risk ratio. The formula is: K% = W – [(1–W) ÷ R], where W is win rate and R is average win divided by average loss. A 55% win rate with a 1.5:1 reward-to-risk suggests roughly 18% Kelly — most professionals use half-Kelly or quarter-Kelly for psychological resilience. Capital allocation frameworks like fixed-fractional betting and drawdown management form the scaffolding that keeps a trader in the game long enough for their edge to express itself across hundreds of trades.

Daniel's strategy was never the problem. The maths were always there to save him — he just never ran them.

This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.