Key Takeaways
- Drawdown is measured from a running peak, not from the starting value. A new high resets the reference point.
- Recovery gain is d / (1 - d). It is not the mirror of the loss, and the gap widens as the loss deepens.
- Below roughly 20%, the asymmetry is mild. Past 50%, it becomes the dominant fact about the position.
- Time underwater often matters more than depth. A shallow decline lasting four years tests conviction harder than a sharp one lasting four weeks.
- Maximum drawdown is one observation from one path. It is a lower bound on what is possible, never a ceiling.
- Two portfolios with the same return and the same volatility can have very different maximum drawdowns, and that difference is what determines whether an investor stays in the seat.
What Is a Drawdown?
A drawdown is the percentage decline from the highest value an account has reached so far to its current value. The word "so far" is doing real work: the reference point is a running peak that ratchets upward and never falls, so a decline is always measured from the best moment that preceded it.
Drawdown = (running peak - current value) / running peak
Consider an account that runs $100,000 to $80,000 to $120,000 to $90,000. The first decline is 20%, measured from the $100,000 peak. The second is 25%, measured from $120,000, not from $100,000, because $120,000 became the new peak in between. Maximum drawdown for this series is 25%, and it is the second decline, not the first, even though the second decline ended at a higher dollar value.
That construction is what makes drawdown a path measure rather than an endpoint measure. Compound annual growth rate reads two points and ignores everything between them. Drawdown reads the whole path and reports its worst stretch, which is precisely the information CAGR discards. Swoopr Investment's CAGR Calculator covers the other half of that pairing, and the Calmar ratio divides one by the other.
Why Recovery Requires More Than the Loss
The asymmetry has one cause: a percentage loss and a percentage gain are computed on different bases. The loss applies to the peak; the recovery gain applies to the trough, which is smaller.
Recovery gain = d / (1 - d), where d is the decline as a decimal
Worked example
A $200,000 account declines 35%.
Trough value = $200,000 × (1 − 0.35) = $130,000
Gain required = $200,000 − $130,000 = $70,000
As a percent = $70,000 / $130,000 = 53.85%A 35% decline requires a 53.85% gain. The 18.85-point gap between the loss and the required recovery is the compounding penalty, and it grows non-linearly.
| Decline | Gain required | Gap |
|---|---|---|
| 5% | 5.3% | 0.3 points |
| 10% | 11.1% | 1.1 points |
| 20% | 25.0% | 5.0 points |
| 30% | 42.9% | 12.9 points |
| 40% | 66.7% | 26.7 points |
| 50% | 100.0% | 50.0 points |
| 60% | 150.0% | 90.0 points |
| 70% | 233.3% | 163.3 points |
| 80% | 400.0% | 320.0 points |
| 90% | 900.0% | 810.0 points |
Read the table as a map of where the arithmetic turns hostile. Under 20%, the required gain is close enough to the loss that ordinary returns can close it in a reasonable period. Past 50%, the gap exceeds the loss itself, and the recovery starts to require a multi-year run of well above-average returns rather than a normal one.
Common mistake: assuming a 50% loss followed by a 50% gain returns to break-even. It does not. $100,000 down 50% is $50,000, and up 50% from there is $75,000, still 25% below where it started.
Drawdown and Recovery Calculator
Two modes. Equity series takes account values in chronological order and reports maximum drawdown, current drawdown, time underwater, and the recovery gain each requires. Single drawdown skips straight to the asymmetry: enter a decline percentage and see what it takes to get back.
All calculations run in your browser. Values you enter are not sent to Swoopr Investment's servers, stored, or logged.
Depth Is Half the Story: Time Underwater
Two declines of identical depth are not equivalent experiences. One that reaches its trough in six weeks and reclaims the old high three months later is a bad quarter. One that reaches the same trough over two years and takes another three to recover is five years of an account that has produced nothing while remaining fully invested and fully exposed.
Time underwater is the count of consecutive periods spent below a prior peak. It is the statistic that most directly maps onto the reason people abandon otherwise sound strategies, because the abandonment decision is almost never made at the trough. It is made months later, during the flat stretch, when the recovery has not yet arrived and the case for patience has stopped feeling like evidence.
The calculator reports the longest consecutive underwater run in whatever unit the entered values represent. Enter monthly balances and it counts months; enter daily balances and it counts days.
What This Calculator Does Not Model
- Deposits and withdrawals. The series is treated as pure investment performance. A contribution looks like a gain and a withdrawal looks like a drawdown, so cash flows must be removed before the values are entered or the results will be wrong.
- Prediction. Maximum drawdown is one realized observation. It says what did happen on one path, not what can happen. The Drawdown Distribution Explorer simulates many paths to show the distribution instead.
- Measurement frequency. Drawdown measured on monthly closes will understate what an intramonth or intraday series would show, because the deepest point can fall between two observations.
- Taxes, fees, and financing costs. None are applied.
- Recovery timing. The required gain is arithmetic. How long it takes to earn depends on returns the calculator has no view on.
- Leverage. A leveraged account can face a margin call or forced liquidation partway down, which ends the position before any recovery arithmetic gets a chance to apply.
Nothing here is a recommendation to hold, sell, or add to any position, and no output is a forecast.
Frequently Asked Questions
How do you calculate drawdown?
Track a running peak through the account value series: the highest value seen so far at each point in time. Drawdown at any point is the running peak minus the current value, divided by that running peak. Maximum drawdown is the largest such figure across the whole series. The running peak matters because it resets upward whenever a new high is set, so a decline from a later, higher peak is measured against that peak rather than the original starting value.
What gain is needed to recover from a drawdown?
The required gain equals d divided by (1 minus d), where d is the decline expressed as a decimal. A 20% decline needs 0.20 / 0.80, or 25%. A 50% decline needs 0.50 / 0.50, or 100%. A 90% decline needs 0.90 / 0.10, or 900%. The asymmetry exists because the loss shrinks the base the gain is calculated on: after losing half, every remaining dollar has to do the work two dollars used to do.
What is the difference between maximum drawdown and current drawdown?
Maximum drawdown is the worst peak-to-trough decline anywhere in the series, a historical worst case that already happened. Current drawdown is how far the latest value sits below the highest value reached so far, which describes the position right now. An account can have a 40% maximum drawdown from three years ago and a 0% current drawdown because it has since made new highs. Both are worth tracking, and they answer different questions.
Why is drawdown a better risk measure than volatility?
It is not strictly better, but it captures something volatility misses. Standard deviation treats upside and downside movement identically and describes dispersion around an average. Drawdown describes the specific path an investor actually lived through: the deepest hole, and how long it lasted. Two portfolios with identical volatility and identical end values can have very different maximum drawdowns, and the one with the deeper hole is far more likely to have been abandoned before the recovery arrived.
What counts as time underwater?
Time underwater is the number of consecutive periods the account spent below a previous peak before setting a new high. It is often the more punishing statistic. A 25% drawdown that recovers in two months is a different experience from a 25% drawdown that takes four years, even though the depth figure is identical. This calculator reports the longest consecutive underwater run in the series, measured in whatever period the values represent.
Does past drawdown predict future drawdown?
No. Maximum drawdown is a single historical observation from one sample path, and the deepest decline in any finite record is very likely smaller than the deepest decline still possible. A strategy showing a 15% maximum drawdown over three years has not demonstrated a 15% ceiling; it has demonstrated that 15% was enough over that particular window. Treat the figure as a lower bound on what could happen, never a limit.
Does the calculation distinguish a decline caused by losses from one caused by a withdrawal?
No. The formula compares current value against the running peak, and a withdrawal reduces current value exactly as a loss does, so an account paying out cash registers a drawdown it did not experience as performance. For an account with regular withdrawals, the drawdown figure has to be computed on a return series adjusted for flows rather than on raw balances, or it reports the spending plan rather than the strategy.
How is the running peak defined for a new account?
The starting value is the initial peak, and it rises only when the account exceeds it. That means a new account that declines before ever gaining shows a drawdown measured from its opening balance, which is correct but easy to misread as a comparable figure to a long-running account's maximum drawdown. Deposits complicate it further, since adding capital raises the balance without representing a gain and can reset the peak artificially.
What does the recovery gain figure assume about position sizing afterwards?
That the same capital is redeployed in the same way, so the required percentage gain is computed on the reduced balance. If risk is sized as a percentage of equity, position sizes fall automatically after a decline and the dollar gains needed take longer to accumulate than the percentage alone suggests. If sizes are held constant in dollars instead, the recovery requires a larger share of the remaining account to be at risk, which raises the chance of a deeper decline.
References
The recovery-gain arithmetic on this page is a mathematical identity and is derived in full above rather than cited. The investor-behaviour and risk-framing claims are sourced to U.S. regulator investor education, verified in August 2026. No statistic here is estimated or drawn from an external dataset: every figure comes from the inputs shown.
- SEC Investor.gov: Asset Allocation and Diversification: the SEC's investor-education material on risk tolerance, spreading risk across asset categories, and rebalancing after a decline.
- SEC Investor.gov: Types of Orders: relevant to the limitations section, since a stop order becomes a market order when triggered and cannot cap a decline at a chosen depth.
- FINRA: Rule 4210, Margin Requirements: the maintenance-margin rules behind the forced-liquidation risk that can end a leveraged position partway into a drawdown.
Jurisdiction: United States. Last reviewed by the Swoopr Editorial Team in August 2026. This page is educational and is not personalized investment advice. Past performance does not guarantee future results, and no drawdown figure shown here is a forecast.