Maximum drawdown formula in simple terms
Maximum drawdown shows the largest percentage fall in an account from a high point to a later low point before a new high is reached. It focuses on the worst loss an account could face during a losing period, not on average results.
The standard formula is: (trough value - peak value) / peak value x 100.
The peak value is the highest balance or equity the account has reached in the measured period. The trough value is the lowest balance seen after that peak and before a new higher peak appears. The result is negative if there is a loss, but traders usually refer to the absolute value, for example "a 25% maximum drawdown". The metric is applied to the account equity curve, including open positions and floating profit or loss, so it reflects real-time risk exposure. Maximum drawdown is the single worst peak-to-trough percentage fall within the selected period.
How the drawdown formula works step by step
In practical use, the formula is applied continuously along the account equity curve:
01
Track the running highest equity value reached so far.
02
After each new balance or equity point, compare it to that highest value.
03
If equity moves above the previous high, update the peak.
04
If equity moves below that high, treat it as part of a drawdown from the last peak.
05
Calculate the percentage fall using the formula for every peak-to-trough move.
06
Record the largest percentage drop as the maximum drawdown.
Trading platforms such as MT4 and MT5 show equity including open leveraged positions, so the calculation reflects unrealized losses in pairs like USD/ZAR or EUR/ZAR. For South African traders using leverage, maximum drawdown highlights how far an account can fall from its best level before conditions improve.
Worked example for a forex trading account
Consider a USD trading account with the following changes:
| Stage | Description | Account value (USD) |
|---|---|---|
| 1 | Initial capital | 10,000 |
| 2 | After profitable trades | 12,000 (peak) |
| 3 | After losing, leveraged trades | 8,000 (trough) |
Apply the formula:
- Step 1: 8,000 - 12,000 = -4,000.
- Step 2: -4,000 / 12,000 = -0.3333.
- Step 3: -0.3333 x 100 = -33.33%.
The maximum drawdown is 33.33%. The sign only shows direction; traders usually quote it as "33.33% drawdown".
If the account later climbs to a new peak of 15,000 USD and then falls to 11,000 USD, that drop is:
- 11,000 - 15,000 = -4,000.
- -4,000 / 15,000 = -0.2667.
- -0.2667 x 100 = -26.67%.
Between the two periods, the overall maximum drawdown remains 33.33%, as it is the larger of the two percentage declines.
What drawdown means for recovery
Drawdown and recovery are not symmetric. A loss of a certain percentage needs a larger percentage gain to reach the previous peak again. This often surprises first-time users.
Using the earlier example:
- A decline from 12,000 USD to 8,000 USD is a 33.33% drawdown.
- To go from 8,000 USD back to 12,000 USD needs a 50% gain.
A 50% drawdown would require a 100% gain to recover. This is why many traders set a personal maximum acceptable drawdown, for example 20% or 30%, beyond which trading is paused and the approach is reviewed. The time taken to recover also matters: two strategies can show the same maximum drawdown but very different recovery speeds, and therefore very different risk profiles.
Forex-specific aspects of drawdown in South Africa
Maximum drawdown in forex usually reflects the full equity of the account:
- Open positions and floating losses are included, not only closed trades.
- High leverage frequently used in forex can make small price moves generate noticeable drawdown changes.
- Volatile pairs often traded from South Africa, such as USD/ZAR and EUR/ZAR, can cause sharp swings in equity and larger temporary drawdowns.
Because the metric is based on the equity curve rather than only on closed balance, it reacts immediately when markets move against open positions. This makes monitoring drawdown an active part of managing leverage and position size in day-to-day trading.
Tracking drawdown with a spreadsheet
Some traders prefer to track drawdown outside the trading platform, for example in a spreadsheet with daily equity values. A typical approach is:
01
Keep one column with the date and one with daily equity.
02
Create a third column with the running maximum equity so far.
03
In a fourth column, calculate the percentage difference between current equity and the running maximum.
04
Identify the most negative value in that column as the maximum drawdown.
The logic mirrors the peak-to-trough concept: every time equity hits a new high, the peak updates; every time it falls, the percentage drop from that peak is recorded. Adding new equity data points extends the series automatically.
Absolute and relative drawdown
The term drawdown is used in slightly different ways:
- Absolute drawdown: fall in the account from a peak to a trough, using only the account's own values.
- Relative drawdown: similar decline measured relative to a benchmark, such as a currency index.
Forex traders typically work with absolute drawdown because it directly affects margin, stop-out risk, and the survival of the account. Some traders define a maximum acceptable absolute drawdown level and stop or reduce activity once that level is reached.
Limitations of maximum drawdown as a risk measure
Maximum drawdown is a useful snapshot of worst observed loss, but it has boundaries:
01
It does not describe how frequently drawdowns occur.
02
It does not show how long it took to recover after the trough.
03
It does not distinguish between one sharp drop and a long slow decline.
To add context, traders sometimes compare maximum drawdown to returns. One common example is to divide annual return by maximum drawdown to see how much return was achieved per unit of risk. A 30% maximum drawdown might be viewed differently when paired with 90% yearly returns than with 15% yearly returns.
For new forex users in South Africa, applying the formula to historical or demo-account data helps clarify what kind of worst-case percentage loss a strategy has already shown, and how much recovery effort would be needed if a similar drawdown happened again.
Frequently asked questions
What is a safe drawdown percentage for a beginner forex trader in South Africa?
Most risk guidelines suggest keeping maximum drawdown below 20-30% for sustainable trading. A drawdown above 30% means you need significantly larger gains to recover—for example, a 50% drawdown requires a 100% gain just to break even. South African traders should monitor drawdown closely when using high leverage, as it amplifies both gains and losses on pairs like USD/ZAR.
How do I calculate drawdown on my MT4 forex account?
MT4 shows your account equity in real time, which includes open positions and floating profit or loss. To calculate drawdown manually, take your highest equity peak, subtract the current or lowest equity value after that peak, then divide by the peak value and multiply by 100. Many South African traders also use tools like Myfxbook that automatically track and display maximum drawdown from connected MT4 accounts.
Is drawdown the same as a losing streak in forex trading?
No, drawdown measures the percentage drop from a peak equity value to the lowest point before recovery, regardless of how many trades caused it. A losing streak counts consecutive losing trades, but drawdown focuses on the total capital decline. You can have a large drawdown from just one heavily leveraged losing position, or from multiple smaller losses over time.