Max Drawdown Explained: Formula, Worked Example and Breach Levels

By Marcel Hambálek · Senior Trader, For Traders

Max drawdown (MDD) is the largest peak-to-trough decline an account suffers before making a new equity high, measured from the high water mark rather than the starting balance: Max Drawdown = (Trough Value − Peak Value) ÷ Peak Value × 100. In prop trading it is also a hard rule — on a $100,000 account a 10% max drawdown closes the account the moment equity touches $90,000.

Key takeaways

• Max drawdown measures peak-to-trough decline from the high water mark, not from your starting balance — every new equity high resets the peak you are measured against.
• The formula is Max Drawdown = (Trough Value − Peak Value) ÷ Peak Value × 100, and it is a curve concept, not a single-trade concept.
• As a prop rule, max drawdown is a fixed dollar line: 5%, 8%, 10% or 12% of a $100,000 account means a breach at $95,000, $92,000, $90,000 or $88,000 respectively.
• Static, end-of-day trailing and intraday trailing drawdown can produce three different outcomes from the identical trade sequence — intraday trailing is the strictest.
• The daily loss limit is a second, separate line that usually triggers before max drawdown does; you must trade inside whichever is closer today.
• Recovery is asymmetric — a 20% drawdown needs a 25% gain and a 50% drawdown needs 100% — which is why risk per trade, not win rate, decides whether you survive a losing streak.

Watch: related video

What Is Max Drawdown in Trading?

Max drawdown (MDD) is the largest peak-to-trough decline your equity curve suffers before it climbs to a new high. That's the maximum drawdown meaning in one sentence — it's not one bad trade, it's the deepest dent in your account balance measured from its best point so far.

The max drawdown formula

Strip away the jargon and it's simple arithmetic:

Max Drawdown = (Trough Value − Peak Value) ÷ Peak Value × 100

Say your account peaks at $110,000, then bleeds down to $95,000 before you claw back to a new high. Your MDD is (95,000 − 110,000) ÷ 110,000 × 100 = -13.6%. That number — not your win rate, not your average R:R — is often the first thing a funding evaluator or a prop firm's risk desk looks at.

Why the peak is the high water mark, not your starting balance

The high water mark is the highest equity value your account has ever reached. It's the reference point for every drawdown calculation, and it only moves in one direction: up. Every time you print a new equity high, the high water mark resets there — it never floats back down when you lose.

This trips up newer traders constantly. You start with $100,000, grind up to $106,000, then give it all back to breakeven. Your balance reads exactly what you started with — but your drawdown isn't zero. It's 6%, measured from that $106,000 peak. The market doesn't care what you deposited; it cares what you had and lost.

Drawdown is a curve concept, not a trade concept

A single losing trade is a loss. Drawdown is a property of the equity curve — it's the cumulative effect of a losing streak, a bad week, or a string of trades that goes against your edge before it turns. You can have a losing trade with zero net drawdown if it happens right after a fresh high with room to spare. Conversely, a series of small, "acceptable" losses can compound into a deep peak-to-trough decline nobody flagged in real time because no single trade looked alarming.

Metric vs hard rule: the two meanings you'll meet

You'll run into MDD in two very different contexts, and mixing them up costs traders their accounts:

• Backward-looking performance metric — analysts and backtests use max drawdown to describe how rough a strategy's worst historical stretch was. It's descriptive, reported after the fact.
• Forward-looking prop firm rule — this is the one that bites. A firm sets a max drawdown limit — say 10% on a $100,000 account — and the moment equity touches $90,000 from the high water mark, the account is breached and closed. Here it isn't a statistic, it's a trigger.

How to Calculate Max Drawdown: A $100,000 Worked Example

Max drawdown formula: (Trough Value − Peak Value) ÷ Peak Value × 100. The trap is assuming the biggest dollar loss on your equity curve is automatically your max drawdown — it isn't. Below is a $100,000 XAUUSD gold account where the smaller dollar loss produces the larger percentage drawdown, which is the one that actually breaches a challenge.

Step-by-step calculation

1. Track equity, not just balance. Log equity after every closed trade (or every tick if you're doing full equity curve calculation) — open floating losses count.
2. Mark each new high water mark. Every time equity exceeds its prior ceiling, that becomes the new peak value your drawdown gets measured against.
3. Measure every decline from its own peak. Each pullback resets its percentage calculation from the high water mark that preceded it — not from your starting $100,000.
4. Take the deepest one. Compare every drawdown episode on the curve; the largest percentage decline is your max drawdown, full stop.

The $100,000 XAUUSD equity sequence

Here's a real-shaped sequence trading gold through a trending phase followed by a chop-and-pullback phase:

Why the biggest dollar loss isn't always the biggest drawdown

The second decline cost you $14,880 in real dollars — bigger than the $12,840 lost in the first stretch. But because it started from a $200,000 peak instead of a $100,000 one, it only registers as −7.44%. The first decline, despite losing less cash, wiped out 12.84% of the peak value it fell from. That −12.84% is your max drawdown for this equity curve, not the −7.44% leg that actually cost more money.

This is the exact trap that catches traders reviewing their own

Max Drawdown as a Prop Firm Rule: The Exact Level That Closes Your Account

In a prop trading challenge, max drawdown stops being a performance metric and becomes a tripwire: touch the number and the account is done, no matter how the rest of your equity curve looks. On a $100,000 account with a 10% max drawdown breach rule, that tripwire sits at $90,000 equity — not balance, equity — and it doesn't care whether you're up 8% for the month before that one bad NFP print.

$100,000 account: breach levels at 5%, 8%, 10% and 12%

Every max drawdown prop firm challenge publishes this number in the rulebook, but traders rarely translate the percentage into an actual dollar figure until they're staring at a margin call. Here's the reference table you should screenshot before you fund an evaluation:

Under a static rule, the breach level is fixed at account opening and never moves — it's calculated once, off the starting balance, full stop. Under a trailing rule, the floor climbs with every new equity high, which is why the trailing column above shifts up once the account has banked $5,000 in profit. This distinction matters more than the headline percentage: a trader on a 10% static $100,000 account drawdown rule who's up $8,000 still has $10,000 of room to give back. The same trader on a trailing rule has effectively zero room below their peak — the account can breach even while sitting in profit.

What happens at the moment of breach

Breach isn't a warning — it's an execution event. The moment equity prints at or through the trigger level, most platforms auto-liquidate open positions, lock the account, and end the evaluation (or terminate a live funded account breach) on the spot. No performance rewards are paid on whatever floating gain existed before the breach, even if price reversed in your favor ten seconds later. Some challenge providers offer a paid reset or a fresh attempt; others require starting the evaluation from zero. Read your specific max drawdown breach rules before you trade — reset policy is not standardized across the industry, and assuming leniency you don't actually have is how a recoverable red day turns into a full restart.

Why you should write your kill number down before trade one

The rule is almost always checked on floating equity, not closed P&L — which means an open position underwater by $9,800 on a $10,000 buffer can breach the account without you ever hitting the close button. A gap, a slippage-heavy NFP fill, or simply holding through lunch chop can do it. So before your first trade on any new evaluation, write the literal dollar figure — not the percentage — on a sticky note next to your screen. "$90,000" stops you faster than "10% max drawdown" ever will, because it's a number you can check against your platform equity line in real time, mid-trade, without doing arithmetic under pressure.

Max Drawdown vs Daily Loss Limit: Two Separate Lines

Max drawdown and daily loss limit are not the same rule wearing two names — they're two independent kill lines, and breaching either one ends the account regardless of what the other line says. Max drawdown is cumulative and never resets; the daily loss limit resets every 24 hours at server rollover. Mix them up in your head and you'll blow an account thinking you had room to spare.

How the daily loss limit is measured and when it resets

The daily loss limit is calculated from your equity or balance at the start of the trading day — check your specific challenge rules, since some providers use balance-at-open and others use equity-at-open, and that distinction matters if you're holding a floating loss when the day rolls over. The clock resets at a fixed server time (commonly midnight platform time), which is separate from your local time zone. Once that reset happens, you get a fresh daily allowance — but your max drawdown buffer, calculated from your all-time equity high, does not reset with it.

Why the daily limit usually triggers first

Run the numbers on a $100,000 account with a typical 5% daily loss limit and 10% max drawdown: your daily line is $5,000 away, your overall line is $10,000 away. On any single session, the daily limit is the tighter constraint by a factor of two. That's why, across challenge failure reasons we see, daily-limit breaches vastly outnumber total-drawdown breaches — traders don't usually grind out a slow bleed to -10%, they blow through -5% in one bad session chasing a loss back.

Stacking both rules into one pre-trade number

Before you place a trade, compute your distance to both lines and size against whichever is smaller — that's your real risk budget for the session, not the headline drawdown figure. If you're $1,200 away from your daily limit but $6,000 away from max drawdown, you trade like a trader with $1,200 of room, full stop.

Watch the rollover-time trap: a losing streak that straddles the reset can look perfectly survivable on the daily line — each session individually stays inside 5% — while the same streak quietly eats through your overall drawdown buffer night after night. The daily loss limit resetting doesn't mean the damage resets. Track cumulative equity against your high water mark separately from your daily P&L, or you'll pass every single daily check right up until the max drawdown line ends the account.

What Actually Counts Toward Drawdown: Floating P&L, Swaps and Gaps

Yes — under equity-based rules, floating P&L counts toward drawdown the instant it prints, before you've closed anything. This is the question most explainers skip, and it's the one that busts accounts. If your rulebook measures equity (balance + open positions marked to market), an unrealised loss is already a breach the moment it hits your buffer — you don't get to wait and see if it recovers.

Balance-based vs equity-based measurement

Two ways firms track drawdown, and the difference is everything:

• Equity-based: counts open positions live, tick by tick. A $96,000 account with an $89,900 max drawdown floor and a position underwater by $4,100 has already breached — even if you were planning to hold back to breakeven. The market doesn't care about your plan; it cares about the number on screen right now.
• Balance-based: only closed trades count. More forgiving — you can be down $10,000 on an open swing and still be technically clean until you hit close — but it's rarer, and most retail prop rulebooks default to equity-based specifically because it's harder to game.

Read your specific challenge terms before you size a position. Assuming balance-based when you're actually on equity-based is how traders get closed out on a trade they were "about to exit anyway."

Do commissions, swaps and financing count?

In almost every rulebook, yes — commissions, swap and overnight financing all reduce equity, and equity is what drawdown is measured against. A single day's commission on a scalping session barely moves the needle. But hold XAUUSD or a US100 futures-adjacent CFD position over several nights and swap alone can quietly eat a real chunk of your buffer without a single adverse tick against you. You can be flat on price and still bleeding drawdown room.

Weekend gaps, holds over news and slippage

Your stop-loss does not protect you against a gap through it — it protects you against price trading through it in a continuous session. A weekend gap or a post-NFP/FOMC gap skips the levels in between. Your stop was resting at -$2,000; price opens Sunday at -$6,000. Slippage on the fill just cost you $4,000 of buffer you didn't budget for, and it happened while you were asleep.

Practical rule: if your remaining drawdown buffer is under roughly 2R going into a weekend or a major news print, reduce size or flatten the position. It's not about being right on direction — it's about not letting a gap you can't control decide whether the account survives the reset.

What Is a Good Max Drawdown for Your Trading Style?

A good max drawdown depends on your style, but as a rule of thumb: 5-10% is tight and systematic, 10-20% is normal discretionary swing trading, 20-30% is aggressive territory that needs an exceptional return to justify it, and anything above 30-35% usually points to a sizing or edge problem — not bad luck. Is 20% max drawdown bad? Not automatically, but it puts you in the zone where the return profile has to work hard to earn it.

Drawdown tiers: 5-10%, 10-20%, 20-30% and above 35%

Calmar, MAR, Sharpe and Sortino — what each adds

Max drawdown alone tells you the worst it got. The Calmar ratio — annualised return divided by max drawdown — tells you the return you're earning per unit of that pain. A trader posting 30% annual return with a 15% max drawdown has a Calmar of 2.0; posting the same 30% with a 30% drawdown gives you a Calmar of 1.0, half the efficiency for the same reward. The MAR ratio is essentially the same math applied over a longer track record, and it's the metric most fund allocators actually screen on before they even look at the equity curve.

Sharpe ratio and Sortino ratio measure something different: volatility-adjusted return, not drawdown-adjusted return. That distinction matters because an account can post a strong Sharpe ratio and still have had a trough that would have blown a $100,000 challenge. Sortino refines this by only penalizing downside volatility, which flatters strategies with sharp upside spikes — but neither ratio flags a single catastrophic trade buried in an otherwise smooth curve. That's the core reason you quote Calmar ratio vs max drawdown together, not either alone: max drawdown shows the worst-case pain, Calmar shows whether the return justified it.

Why drawdown depth matters less than drawdown shape

Two accounts can both show a 15% max drawdown and tell completely different stories. One recovers to a new equity high in three weeks — a normal pullback inside a working system. The other takes nine months to climb back, bleeding through choppy, directionless price action the whole way. Same depth, same number on the report, but the second account carried far more psychological and structural risk — nine months is long enough for a strategy's edge to decay, for a trader to abandon the plan mid-drawdown, or for a prop firm's time-based rules to end the account before recovery even happens. When you evaluate your own curve, or size up a funded account, look at the recovery slope, not just the trough.

Drawdown Recovery Math: Why Losses Cost More Than They Look

A 20% drawdown doesn't need 20% back — it needs 25%. A 50% drawdown needs a full 100% gain just to get you to breakeven. This is the arithmetic every trader underestimates, and it's the reason drawdown control matters more than win rate on a challenge account.

The math is simple but brutal: once you lose money, you're earning your way back on a smaller base. Drop $10,000 to $9,000 (10% down) and that $1,000 you need to recover is now 11.1% of your remaining capital, not 10%. The gap widens fast, and past 30% it stops being a rounding error and starts being a different game entirely.

The recovery percentage table

This recovery math table is the single chart every prop trader should have pinned above their desk. On a funded account, the drawdown floor doesn't just track your losses — it constrains how hard you can push to earn them back, since a max drawdown breach closes the account regardless of how convinced you are the next trade turns it around.

Drawdown recovery time and what it does to your evaluation clock

Drawdown recovery time in trading isn't a feeling, it's a function of two numbers: expectancy per trade and trade frequency. A system averaging 0.3R per trade, taking 20 trades a month, generates roughly 6R of expectancy per month. Climbing out of a 20% hole at unchanged position size — call it 20R of ground to make up depending on your risk-per-trade — takes that trader somewhere around six months of grinding at the same edge, same size, no shortcuts. That's six months your evaluation clock, your funded-account trailing rules, or your own patience may not survive.

Why traders blow up trying to make it back fast

The instinct in a drawdown is to double size and cut the recovery time in half. It's also the single most common cause of breach. Doubling size doesn't just double your expected recovery speed — it doubles your variance, which means a normal losing streak that would have cost you 8% now costs you 16%, and you're through the daily loss limit before you've had a chance to prove the math wrong. This is revenge trading in its most disciplined-looking disguise: not a tilt-fuelled all-in, just a "reasonable" size bump that quietly changes your risk profile.

The correct move is the opposite of instinct: cut size while you're in drawdown, and only restore it once you've printed a new high water mark. A trader running half-size through a 20% hole takes longer to recover on paper, but arrives there with an account still open — which beats a faster recovery math that never gets tested because the account breached first.

Risk Per Trade: Sizing Against Your Worst Realistic Losing Streak

A 45% win rate system will hand you a 10-loss streak sooner than most traders think — that's normal sample variance, not bad luck, and your position sizing has to survive it. Run the binomial math: with a 55% loss rate, the probability of at least one 10-loss streak inside a 100-trade sample is well over 50%. If you're only sizing for your average losing run, you're sizing for a scenario that won't show up in the sample that actually breaches your account.

This is where risk per trade and drawdown stop being two separate conversations. Risk per trade is the input; max drawdown is the output. Get the input wrong and the output arrives faster than your equity curve — or your challenge rules — can absorb.

Streak table: 5, 8, 10 and 15 consecutive losses at 0.5%, 1% and 2% risk

Cumulative drawdown compounds down as equity shrinks, so the real number is slightly lower than simple multiplication — the table below uses compounded loss-per-trade, which is the honest version.

Look at the 1% row against 10 losses: 9.6%. Against a 10% max drawdown line, that's a streak — not even a rare one — leaving you with 0.4% of headroom before the account closes. One more loss and you're done, regardless of how sound the strategy is over the next 200 trades.

Risk of ruin and what Monte Carlo tells you

Risk of ruin is the probability your account hits zero (or your max drawdown floor) before your edge has time to play out. It's driven by three inputs: win rate, average R:R, and risk per trade — and risk per trade is the only one you fully control in real time.

A generic streak table uses theoretical probabilities. A Monte Carlo simulation run on your own trade history — shuffling your actual last 100-200 trades into thousands of randomized sequences — gives you a personal worst-case streak instead of a textbook one. If your simulation spits out a 5th-percentile drawdown of 22% at 1% risk, that's your number, not the generic 9.6%, because it accounts for your real win distribution, not an idealized coin flip.

A recommended ceiling for a 10% max drawdown

The table writes the conclusion for you: 1% risk leaves almost no buffer under a 10% line once a 10-loss streak hits, so 0.5% risk per trade is the practical working ceiling for a challenge with a 10% max drawdown rule. If the account also carries an intraday trailing drawdown — which moves the floor up with every new high rather than staying fixed — drop to 0.25-0.4% for extra room against days where the trail and a losing streak overlap.

Add one scaling rule to the position sizing plan: cut size after three consecutive losses, not before, and never scale up after three consecutive wins to "make it back faster." Risk goes down in a drawdown and comes back up only once you've printed a fresh high water mark.

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