The Brutal Math of Drawdowns
A drawdown is the percentage drop from your account's peak value to its lowest point. It is the most important metric for risk management, because the mathematics of recovering from a drawdown are highly asymmetrical.
When you lose money, your account balance shrinks. This means you have less capital available to generate the returns needed to make the money back. You have to achieve a higher percentage return just to get back to where you started.
Drawdown Recovery Reference Table
This table perfectly illustrates why professional traders focus so heavily on capital preservation and tight stop losses. As drawdowns deepen, the required recovery gain accelerates exponentially.
Prop Firms and Drawdown Limits
If you trade for a proprietary trading firm (prop firm), you are usually constrained by two strict rules:
- Daily Drawdown: Usually 4% to 5%. If your equity drops by this amount in a single day, you lose the account.
- Maximum Drawdown: Usually 8% to 10%. If your total account equity ever drops by this amount from its starting value (or trailing peak), you lose the account.
Because of these strict limits, prop firm traders must use very low risk per trade (e.g., 0.25% to 0.5%) to ensure a standard losing streak doesn't trigger a drawdown breach.
The Psychology of Recovery
The biggest trap traders fall into during a drawdown is revenge trading. When faced with a 20% drawdown, human psychology urges the trader to increase their lot size to"win it all back in one trade."
This is exactly how a 20% drawdown turns into an unrecoverable 80% drawdown. The mathematically correct way to handle a drawdown is to temporarily decrease your position size, focus purely on executing your trading edge, and accept that the recovery will take time.