Direct answer
In forex, drawdown means the decline in an account’s value from a previous peak to a later trough. It is commonly computed from the account’s equity curve (the tracked value over time). In plain terms: after the account reaches a high point, drawdown shows how much and how far it later went down before recovering (or until the measurement stops).
Explanation: how it works
Drawdown is defined by two points on the same performance series:
- Peak: the highest equity value reached up to that moment.
- Trough: the lowest equity value reached after that peak (until the next new peak or the end of the measurement).
The drawdown amount is the difference between the peak and the trough. It is often also expressed as a drawdown percentage, calculated relative to the peak.
A key detail is that the meaning depends on what equity series is used and how peaks are identified. For example, using equity that includes unrealized gains/losses (mark-to-market) can produce a different drawdown path than using only realized profit. Likewise, whether the calculation updates peaks at every new high or uses a fixed historical reference changes the resulting measure.
Example and checks
Imagine an equity curve that rises to 10,000, then falls to 9,700 before climbing back. The drawdown at that time is the drop from 10,000 to 9,700. If you report it as a percentage, it is the decline relative to the 10,000 peak.
To independently check a drawdown number, verify:
- Where the peak is (the most recent highest equity before the trough).
- Where the trough is (the lowest equity after that peak).
- Whether the calculation is based on equity marked to market or another performance measure.
Relevant limitations and risks
Drawdown is descriptive, not predictive. It summarizes past declines in a chosen equity series, but it does not tell you what will happen next.
Drawdown also has measurement limitations:
- Definition sensitivity: different equity definitions and peak-tracking rules can change the reported drawdown.
- Time-window dependence: the maximum drawdown over a period is affected by how long the period is and what events occurred within it.
- Context missing: drawdown alone does not explain why it happened (for example, trade volatility vs. external changes to account valuation).
For risk understanding, treat drawdown as one lens on variability, not as a complete risk model.