Drawdown: measuring and limiting the drop in your account

Your account never goes up in a straight line. Even with a good strategy, it alternates between rising and falling phases. Drawdown is the measure of those falls. It is one of the most important numbers for judging a strategy or a trader, and often more telling than total profit.

Drawdown, max drawdown and duration

Drawdown is the drop in capital from its last peak, expressed as a percentage. If your account reached $12,000 and then fell back to $10,800, you are in a 10% drawdown. Until the account goes above $12,000, the drawdown is not over, even if you win a few trades in between.

Max drawdown is the largest drawdown seen over the whole period studied. It tells you what you would have had to sit through at the worst moment. Drawdown duration is the time between a peak and the moment the account finally beats it. An 8% drop that lasts six months can be harder to live through than a 15% drop recovered in three weeks.

The asymmetry of recovery

This is the point that surprises beginners most. A loss and the gain needed to make it up are not symmetrical. If you lose 50%, your capital is cut in half, so you have to double it, +100%, to get back to where you started.

Up to 10 or 15%, the recovery effort stays close to the loss. Beyond that, it takes off. An account at −50% has to make +100%, which can take a cautious trader years. That is why the absolute priority is never to let a drawdown get deep.

What drawdown to expect from your strategy

Drawdown depends directly on your risk per trade and your losing streaks. At 1% risk, ten losses in a row come to about −9.6%. At 2%, about −18.3%. If your history shows streaks of eight to ten losses, you know drawdowns of that size are part of how your method normally works.

In a backtest or a track record, the past max drawdown is not a ceiling. The future can produce a longer streak than the one you have seen. A common rule of caution is to prepare for a drawdown at least one and a half to two times bigger than the worst you have measured so far.

Finally, there is the psychological side, often underestimated. On a spreadsheet, −15% is just a number. On your own account, it means weeks of watching the balance fall, doubting your method and being tempted to change everything. Many traders abandon a sound strategy at the worst moment, just before it recovers. Knowing your method's normal drawdown in advance helps you get through it without panicking, and helps you spot an abnormal drawdown, which should make you react.

Setting your own levels

The best time to decide what to do during a drawdown is before you are in one. Once you are in the hole, emotions push you to raise your risk to win it back, which is exactly what you must not do. Write your levels down in advance, for example:

1. At −5% from the peak: you reread your journal and check that you are following your rules.
2. At −10%: you halve your risk, for example from 1% to 0.5% per trade.
3. At −15%: you stop trading live and analyse your recent trades, on a demo account if needed.
4. You only go back to normal risk after recovering part of the drop with the reduced risk.

These levels work because they slow the fall. Halving your risk at −10% means the same losing streak that cost you 10% will only cost you about 5% the next time. You buy time to understand what is happening: a market that has turned against your method, execution errors, fatigue or plain bad luck. That diagnosis is impossible to make calmly when the account is melting fast.