Maximum Drawdown: What It Is and Why It Breaks More Traders Than Losses Do

Maximum drawdown is the deepest peak-to-trough decline in account equity over a period — the worst stretch, measured from the highest high to the lowest subsequent low, usually expressed as a percentage. If an account grows to $12,000, falls to $9,000, then recovers, the drawdown of that episode was $3,000, or 25% of the peak.

Why drawdown matters more than win rate

Traders rarely quit because their win rate was 48% instead of 55%. They quit — or break their own rules, which is the same thing with extra steps — in the middle of a drawdown, when the strategy has lost nine of its last twelve trades and every instinct screams that it is broken. Maximum drawdown is the backtest's honest preview of that moment. If you cannot imagine sitting through the historical worst stretch with real money, the strategy is not tradeable by you, whatever its profit factor says.

Reading drawdown in a backtest

• Compare it to the net profit. A strategy that made 2,300 pips with a 2,700-pip maximum drawdown spent its history underwater more than it spent ahead. The ratio of return to max drawdown (sometimes called RoMaD) is one of the most honest single measures of strategy quality.
• Look at duration, not just depth. A 20% drawdown recovered in three weeks and a 20% drawdown that lasted eleven months are different psychological events.
• Assume the future will be worse. The historical maximum is the worst that happened in the sample — not the worst that can happen. A common rule of thumb is to plan for at least 1.5× the backtested figure.
• Check the losing streak. Max consecutive losses is drawdown's sibling statistic; it tells you how many losses in a row the entry logic historically produced.

Drawdown and position sizing

Drawdown scales with risk per trade. Risking 2% of equity per trade instead of 1% roughly doubles every drawdown — and drawdowns compound viciously: a 50% drawdown needs a 100% gain to recover. This is why prop-firm evaluations enforce drawdown limits above all other rules, and why any strategy you plan to run through one should be backtested against those exact limits first. ForexEdge reports maximum drawdown, max consecutive losses, and per-trade risk on every backtest, and tracks the same strategy's live drawdown once it trades on a demo account.