Maximum drawdown is the single number that tells you how much pain an account took at its worst. Not your average loss, not your win rate — the deepest peak-to-trough drop your equity curve ever made. If you only track one risk metric, this is a strong candidate, because the math behind recovering from a drawdown is far less forgiving than most traders expect.
This guide defines maximum drawdown, walks through the peak-to-trough formula with a worked equity curve, and then covers the part most people get wrong: the gain you need to claw back a loss grows faster than the loss itself. Lose 50% and you do not need 50% to get back to even — you need 100%.
What Is Maximum Drawdown?
Maximum drawdown (often shortened to max drawdown or MDD) is the largest percentage decline from a peak to a subsequent trough in your account equity, before a new peak is reached.
Two words in that definition do the heavy lifting:
- Peak — a high-water mark. The most your account has been worth up to that point.
- Trough — the lowest point your equity falls to after that peak, before it recovers and sets a new high.
The drawdown is the drop between them, measured in percent. The maximum drawdown is simply the worst such drop over the whole period you are measuring. It is always expressed as a negative number (or its absolute value), and it only looks at closed equity — your account balance over time, not the unrealized swing inside a single open trade.
Where a number like win rate tells you how often you are right, max drawdown tells you how bad it got when you were wrong. A strategy can be profitable on paper and still be untradeable if its worst stretch would have wiped out your nerve, or your capital, before the good times arrived.
The Maximum Drawdown Formula
The formula for a single drawdown is straightforward:
Drawdown % = (Peak value − Trough value) / Peak value
To find the maximum drawdown, you calculate the drawdown at every trough across your equity curve and take the largest one. The key rule: the trough must come after its peak, and you measure each decline from the highest equity reached so far, not from the starting balance.
That "highest so far" detail matters. Drawdown is always measured from a running high-water mark, so a dip that follows a new equity high is a fresh drawdown, even if the account is still well above where it began.
Worked Example: Finding Max Drawdown on an Equity Curve
Say a trading account moves through the following month-end balances. We will walk the curve, track the running peak, and measure each drawdown.
| Month | Equity | Running peak | Drawdown from peak |
|---|---|---|---|
| Jan | $10,000 | $10,000 | 0% |
| Feb | $12,500 | $12,500 | 0% (new peak) |
| Mar | $11,000 | $12,500 | −12.0% |
| Apr | $9,375 | $12,500 | −25.0% |
| May | $13,000 | $13,000 | 0% (new peak) |
| Jun | $11,700 | $13,000 | −10.0% |
Let's verify the drawdowns:
- April trough: the running peak is $12,500 (set in February). Drawdown = ($12,500 − $9,375) / $12,500 = $3,125 / $12,500 = 0.25 = −25.0%.
- June dip: by now the account set a new peak of $13,000 in May, so this drawdown is measured from $13,000, not $12,500. Drawdown = ($13,000 − $11,700) / $13,000 = $1,300 / $13,000 = 0.10 = −10.0%.
The account finishes at $11,700 — up 17% from where it started — yet its maximum drawdown is −25.0%, the February-to-April decline. That single number is what a careful trader would flag: at one point this "profitable" account had given back a quarter of its high-water mark. Profit and drawdown describe two completely different things, and you need both to judge a strategy.
Why the Recovery Math Is Brutal
Here is the part that catches people out. A drawdown and the gain needed to recover from it are not the same size. If you lose 20%, a 20% gain does not get you back to even — because that 20% gain is now calculated on a smaller balance.
The recovery formula is:
Recovery gain % = Loss % / (1 − Loss %)
Run a 20% loss through it: 0.20 / (1 − 0.20) = 0.20 / 0.80 = 0.25 = +25%. You lost 20% but need 25% to recover. And the deeper the hole, the more sharply that required gain accelerates.
| Drawdown (loss) | Gain needed to recover | Why |
|---|---|---|
| −10% | +11.1% | 0.10 / 0.90 |
| −20% | +25.0% | 0.20 / 0.80 |
| −25% | +33.3% | 0.25 / 0.75 |
| −30% | +42.9% | 0.30 / 0.70 |
| −40% | +66.7% | 0.40 / 0.60 |
| −50% | +100% | 0.50 / 0.50 |
| −75% | +300% | 0.75 / 0.25 |
| −90% | +900% | 0.90 / 0.10 |
The relationship is non-linear. Up to about a 20% drawdown the required recovery is only modestly worse than the loss. Past that, it runs away from you: a 50% loss demands you double the account just to break even, and a 90% loss requires a tenfold gain — a 900% return — to recover. That is why professional risk management is obsessed with keeping drawdowns shallow. A shallow drawdown is an inconvenience; a deep one is a different game entirely.
A concrete recovery example
Say an account peaks at $20,000 and then suffers a 50% drawdown, falling to $10,000. To get back to the $20,000 high-water mark, the account has to grow from $10,000 to $20,000 — a +100% gain. If that same trader had instead capped the damage at a 20% drawdown (a trough of $16,000), recovery would only require growing $16,000 back to $20,000, a +25% gain. Same dollar peak, wildly different climb back — purely because of how deep the hole was allowed to get.
Why Max Drawdown Matters
Max drawdown matters for three practical reasons that win rate and total return simply cannot tell you.
1. It measures survivability. A strategy is only tradeable if you can sit through its worst stretch without abandoning it or running out of capital. A backtest showing 40% annual returns is worthless if it also shows a 70% max drawdown you would never actually hold through.
2. It sets a psychological reality check. Numbers on a chart are easy to stomach; watching a real account fall 25% is not. Knowing your strategy's historical max drawdown before you size up prepares you for the worst day, instead of being blindsided by it.
3. It feeds directly into position sizing. The smaller the risk you take per trade, the shallower your drawdowns tend to be, and the easier recovery becomes. This is the lever you actually control. You can't dictate the market, but you can dictate how much of your account rides on any single idea.
How to Manage and Limit Drawdown
You cannot eliminate drawdown — every strategy has losing streaks. But you can keep it in the shallow, recoverable zone with a few disciplines.
- Risk a small, fixed fraction per trade. Risking 1–2% of equity per trade keeps any single loss from meaningfully denting your high-water mark. A run of ten consecutive losses at 1% risk is roughly a 10% drawdown — uncomfortable, but a +11.1% recovery, not a +100% one. Size every trade with the position size calculator so the risk is an exact number, not a feeling.
- Set a drawdown circuit breaker. Decide in advance on a maximum tolerable drawdown — say 15% or 20% — at which you stop trading, review, and reset. A hard stop on the account, not just the trade, is what keeps a bad week from becoming a blown account.
- Avoid revenge sizing. The instinct after a loss is to size up to recover faster. The recovery table shows why that is exactly backward: increasing risk in a drawdown is how a −20% problem becomes a −50% one.
- Measure it continuously. You can only manage what you track. Run your own equity curve through the max drawdown calculator to see your real number, and keep a trading journal so every drawdown is logged with the trades that caused it — that is how you learn whether your worst stretches come from the strategy or from your own discipline slipping.
Max Drawdown vs Other Risk Metrics
Max drawdown is one tool, not the whole toolbox. It pairs well with metrics that describe risk from other angles.
| Metric | What it answers | What it misses |
|---|---|---|
| Max drawdown | How deep was the worst peak-to-trough drop? | How long it lasted; how often it happens |
| Average drawdown | How deep is a typical decline? | The tail-risk worst case |
| Drawdown duration | How long did it take to recover the high-water mark? | The depth of the drop |
| Win rate | How often are trades profitable? | How big wins and losses are |
| Risk-to-reward | How much you stand to make vs lose per trade | Nothing about the equity path |
Read together, these tell a fuller story. Max drawdown is the one that most directly answers "could I have survived this?" — which is why it belongs near the top of any risk review.
Putting It Into Practice
Maximum drawdown reframes risk from "how much do I make" to "how much do I have to give back, and how hard is the climb out." The recovery math is the lesson that sticks: a 50% loss is not twice as bad as a 25% loss — it is far worse, because it demands a 100% gain instead of a 33.3% one. Keep your drawdowns shallow and recovery stays trivial. Let them run deep and you hand the math a problem it may never solve.
Calculate your own number from your real balances with the max drawdown calculator, then log the trades behind it in your trading journal so the next deep drawdown is one you saw coming.
FAQ
What is a good maximum drawdown?
There is no universal "good" number — it depends on the strategy, the instrument, and your own tolerance. As a rough guide, many traders treat a max drawdown under 20% as comfortable, 20–35% as demanding, and anything beyond that as a serious test of both capital and nerve. The recovery math is the reason: drawdowns under 20% recover with a similar-sized gain, while deeper ones require disproportionately larger returns just to break even.
How do you calculate maximum drawdown?
Track your equity over time and a running high-water mark (the highest equity reached so far). At each new low, compute (Peak − Trough) / Peak using the most recent peak that came before that trough. The largest of all those percentages is your maximum drawdown. You can do this by hand for a short series or feed your balances into the max drawdown calculator for a longer one.
Why does a 50% loss require a 100% gain to recover?
Because the recovery gain is calculated on the reduced balance, not the original one. After a 50% loss, your account is half its former size, so doubling it (a 100% gain) only gets you back to where you started. The formula is gain = loss / (1 − loss), so 0.50 / 0.50 = 1.00, or +100%. The deeper the loss, the more sharply this required gain accelerates.
Is max drawdown measured on closed equity or open trades?
Standard max drawdown is measured on your equity curve — your account balance at each point in time. Some traders track an intra-trade version that includes unrealized losses on open positions, which produces a deeper number. Both are valid; just be consistent about which one you report, because they are not directly comparable.
About the author. Artem Gasparyan is the founder of GASPNTRADER, a free trading journal built to help traders track their equity curve, measure drawdowns, and turn risk into something they can actually manage. This article is educational and reflects standard risk-management practice — it is not financial advice.
