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The cost of recovery. The curve hugs the diagonal for mild drawdowns and turns almost vertical beyond 40%.
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There is a quiet arithmetic that closes more trading accounts than any single bad trade. Lose 50% of your capital and you are not halfway down a hole you climb out of symmetrically: now you have to make 100% on what is left just to get back to where you started. Loss and recovery are not mirror images, and the gap between them widens the deeper you fall. That gap is the real story of drawdown, and it is what changes the way you size every position.
Many traders treat drawdown as a number to glance at after a bad week. It is much more: it is the best measure of how much pain a strategy inflicts on the way to its returns, the metric prop firms fail you on, and the variable that decides whether a losing streak is a normal dip or the beginning of the end.
In short: drawdown is the fall from the highest peak reached, not from your deposit. The key figure is maximum drawdown, the deepest peak to trough fall. Recovery is asymmetric and follows G = D / (1 − D): −20% needs +25%, −50% needs +100%, −75% needs +300%. Keeping it shallow, with small and consistent risk per trade, is the whole game. An automatic trading journal watches it in real time for you.
Picture your account equity as a line on a chart that rises and falls over time. Every time it prints a new high, that becomes a peak. When it falls from that peak before making a new one, the distance it travels down is a drawdown. So drawdown is always measured from the highest point previously reached, not from where you started and not from your deposit.
If a €10,000 account rises to 12,000 and then slips to 10,800, that is a 10% drawdown from the 12,000 peak, even though you are still up 8% on your initial capital. The reference is the peak, always.
This is why drawdown captures something profit alone hides. Two accounts can both close the year at +30%, but if one got there on a smooth climb and the other plunged 40% in spring before recovering, they are not the same strategy and do not carry the same risk. Profit tells you where you ended up; drawdown tells you what you had to stomach to get there. It is also why it pays to learn to read the shape of your equity curve.
The word gets used loosely, so it helps to separate the versions you will actually meet. They answer different questions, and prop firms in particular care about the distinction.
Prop firms add a split of their own on top of this, and it is the one that fails the most funded traders, so we treat it separately below. First, the math that makes all of this worth your attention.
It all turns on one formula. The gain needed to recover from a drawdown of depth D is:
G = D / (1 − D) G = gain needed to get back to even · D = drawdown depth
A 20% fall leaves you with 80% of your capital, and 20 divided by 80 is 25%, so you need a 25% gain on the smaller base to get whole again. The trap is that the denominator shrinks as the loss grows. At a 50% drawdown you are working with half your money, so the same 50 points of lost ground now demand a 100% gain. At 75% you have a quarter left and must quadruple it, a 300% return, to undo a single bad run.
The cost of recovery. The curve hugs the diagonal for mild drawdowns and turns almost vertical beyond 40%.
The curve hugs the diagonal while drawdowns are mild, which is why a trader who keeps losses within 20% climbs back without heroics. Beyond about 40% it separates, and beyond 50% it becomes the kind of climb that needs not just skill but a complete change of luck. And the math here is the optimistic version, because it assumes nothing else gets worse. In reality a deep drawdown also shrinks your position sizing, since prudent risk rules make you smaller exactly when you most need to recover, and it erodes the asset that matters most under pressure: your judgement. Confidence cracks, hesitation creeps in, and revenge trades arrive.
Computing it by hand once is a useful exercise. Walk your equity line from left to right, tracking the highest value seen so far, the running peak. At each point, measure how far current equity sits below that running peak as a percentage. The largest of all those percentage gaps, across the whole history, is your maximum drawdown.
Example. An account goes from 10,000 to 13,000, drops to 9,750, then recovers to 14,000. The deepest fall was from the 13,000 peak to 9,750, that is 3,250 below 13,000: a 25% maximum drawdown, even though the account later made a new high. The new high does not erase the scar; maximum drawdown remembers the worst.
If you run a funded account, drawdown stops being a metric to monitor and becomes a rule that can close the account in an afternoon. Prop firms impose two limits together.
Breach either one and the account is gone, no matter how profitable you were the week before. Most failed challenges die on the daily limit, not the overall one, because a single oversized revenge session after a couple of losses is enough to trip it. It is the heart of how to choose a trading journal for an FTMO challenge.
The practical defence is the same one that helps every trader, just imposed by someone else: small, consistent risk per trade. Risking 1% instead of 3% per position roughly triples the number of consecutive losses you can take before nearing a limit. It is also where drawdown connects to the rest of your metrics: a strategy with a high Sortino ratio is, almost by definition, one where the downside is shallow and controlled, exactly the profile that survives prop firm rules. The Calmar ratio goes further and divides annual return directly by maximum drawdown.
You cannot eliminate drawdown, only contain it. The levers are well known:
What holds them together is measurement. You cannot manage a drawdown you only notice once it has already hurt you, and few traders track their running peak by hand honestly. The foundation under all of it is consistent position sizing, because wildly variable bet sizes make every drawdown limit unpredictable.
Watching the equity line by hand is exactly the routine work that quietly stops happening. AlgoTech connects to your MetaTrader 4, MetaTrader 5 or cTrader account with account number and server; credentials are stored encrypted and the platform reads your trade history in read only mode: it does not place orders and does not move funds. From then on you find computed automatically:
If you trade several accounts, each lives in a separate environment with its own history and its own drawdown: the data does not mix, and you switch between them with a click. That is the right way to read drawdown, because each account has to be judged on its own peak, not averaged with the others.
Common questions about drawdown in trading.
Drawdown is not the number you look at after the damage; it is the number you manage to prevent it. Keep it shallow and the recovery math stays on your side, your sizing holds and your judgement survives intact. Let it run deep and you hand the account a debt that compounds against you. The first step is simply seeing it clearly and continuously: peak, trough, current depth and recovery cycles, on your real trades.
This article is for informational purposes only and does not constitute financial advice. The numerical examples are illustrative. Algotech Srl is not a financial intermediary.