Maximum drawdown measures the largest observed decline from an earlier peak to a later low over a defined period. It differs from the biggest losing trade and from the change between starting and ending balances. Use a consistent value series and explain its treatment of timing, open holdings and external cash flows.
Seven observations, no deposits or withdrawals and one consistent valuation currency in the initial example.
BTKWIN.COM · EDUCATIONAL EXAMPLEDefine the value series and the denominator
If an account reaches 12,000 and later falls to 9,000, the decline is 3,000. Relative to the earlier peak, that is 25%. The denominator is the relevant peak rather than necessarily the starting deposit or cumulative funding. This guide uses positive account values and reports drawdowns as positive decline magnitudes.
The research paper Drawdown: From Practice to Theory and Back Again discusses maximum drawdown as a peak-to-trough cumulative loss. Reports can instead display signed negative percentages or absolute amounts, so compare definitions before comparing numbers.
A drawdown can involve several trades or changes in still-open positions. It is therefore different from the loss on one closed transaction. State whether the underlying series is cash balance, account equity including positions or another valuation. Without that scope, a precise percentage can still answer the wrong question.
Calculate a running peak in chronological order
Assume seven hypothetical observations in one currency, with no deposits or withdrawals. At each row retain the highest value seen so far, including the current point. Drawdown equals (running peak − current value) ÷ running peak × 100. A new peak resets current drawdown to zero without erasing earlier declines.
| Observation | Account value | Running peak | Drawdown |
|---|---|---|---|
| 1 | 10,000 | 10,000 | 0% |
| 2 | 12,000 | 12,000 | 0% |
| 3 | 11,400 | 12,000 | 5% |
| 4 | 9,000 | 12,000 | 25% |
| 5 | 10,500 | 12,000 | 12.5% |
| 6 | 12,500 | 12,500 | 0% |
| 7 | 11,000 | 12,500 | 12% |
The largest value in the last column is 25%, so that is maximum drawdown for this observed series. At the seventh observation, current drawdown is only 12%. Those are separate measures: one summarizes the largest historical decline within the chosen period, while the other describes the current point relative to the running peak.
The account finishes at 11,000 versus a starting 10,000, a 10% gain under these assumptions. That does not erase the earlier 25% decline. A beginning-and-ending screenshot omits the path, which can matter when assessing access to funds during the period.
Do not use future peaks or missing observations
The peak of 12,500 appears at observation six. It must not be used retrospectively as the running reference for observation four. At that earlier time, the highest observed value was 12,000. A calculation using a future peak changes the definition and can exaggerate an earlier decline.
Likewise, recording only the first and last day of a month does not establish the deepest decline that happened between them. You can calculate maximum drawdown among the points you have, with that limitation in the label. Additional decimal places do not compensate for missing intraperiod observations.
Cash balance and marked account equity can diverge
A balance curve based on closed transactions may change only when trades settle or positions close. An equity curve including unrealized gains and losses can fall while those positions remain open. If the market recovers before closure, the equity decline can be substantial even when the cash-balance curve looks unchanged.
Consider cash plus an asset whose price falls. Cash alone can remain constant while the marked value of the account declines. For the equity series, record the pricing source, valuation time and treatment of low-liquidity holdings. Do not silently change the method during the period.
Also identify included fees and accrued costs. A net account curve and a theoretical pre-fee curve do not provide a direct like-for-like comparison. Preserve methodology changes as notes instead of interpreting an accounting discontinuity as investment performance.
A new deposit does not establish recovery
Suppose an account peaks at 12,000, falls to 9,000 and then receives a deposit of 4,500. The raw total becomes 13,500, exceeding the previous peak. The investment has not thereby recovered its loss: new money created the increase. Withdrawals can produce the opposite misleading effect in an unadjusted curve.
One illustrative normalization divides the original account into 1,000 notional units. Their values are ten initially, twelve at the peak and nine at the low. Depositing 4,500 when each unit is worth nine adds 500 units. The account now holds 1,500 units worth 13,500 in total, but unit value remains nine.
The unit-value decline from twelve to nine is still 25%. This demonstrates separation of funding from performance; it is not a complete accounting system. Real implementation needs flow timing, suitable contemporaneous valuations and consistent fee treatment. Retain a separate external cash-flow record instead of trying to infer deposits from chart shape alone.
Measure duration as well as depth
Two accounts can have equal maximum percentage drawdown and very different time spent below a peak. In our sequence the peak at observation two is exceeded at observation six, but the rows have not been assigned hours, days or months. Row count alone is not duration.
Use timestamps and define when a drawdown period starts and ends. If recovery has not occurred by the reporting endpoint, label the period open rather than discarding it. Daily sampling can miss an intraday fall that reverses before the chosen valuation time. Choose a frequency appropriate to the question and disclose it.
Recovery uses the remaining value as its base
Returning from 9,000 to 12,000 requires a gain of 3,000 divided by 9,000, approximately 33.33%. A 25% rise from 9,000 reaches only 11,250. Different denominators explain why the needed recovery percentage exceeds the earlier loss percentage.
| Peak decline | Remaining from 100 | Gain needed to regain 100 |
|---|---|---|
| 5% | 95 | 5.26% approximately |
| 10% | 90 | 11.11% approximately |
| 25% | 75 | 33.33% approximately |
| 50% | 50 | 100% |
The loss-recovery calculator explores that arithmetic. Its required increase is not a forecast or a promise of recovery within any time. Increasing exposure to recover faster changes possible future outcomes without changing the basic percentage relationship.
Align reports before comparing them
Match the period, currency, sampling frequency, value definition and handling of flows. One path from 10,000 to 11,000 might pass through 9,000, while another reaches 14,000 before ending at 11,000. Their observed maximum declines can be 10% and approximately 21.43%, despite equal endpoints.
Historical drawdown does not cap future losses. State the scope and data limitations, and show current drawdown separately from the maximum. Use the profit calculator for individual trade cash flows while keeping that question distinct from the account’s chronological peak-to-trough path.
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English content and examples reviewed: 27 October 2026. Read the Arabic edition.
