Maximum Drawdown Calculator

Measure the worst peak-to-trough decline in a historical value series, then review the loss amount, recovery needed, and running drawdown path.

Chronological series only Maximum drawdown measures the worst peak-to-trough decline in order. Enter prices, account values, or index levels in their original sequence.

Interpretation note

Drawdown focuses on downside path risk, not just the start and end values. Two series can finish near the same level while having very different worst declines along the way.

Result

-38.46% max drawdown

Worst decline was from point 4 at 130 down to point 5 at 80.

Peak value
130
Trough value
80
Peak-to-trough loss
50
Recovery gain needed
62.5%
Series is still below its prior peak The last observation is -3.85% below the full-series high, so the path has not fully recovered yet.

Running drawdown path

PointValueRunning peakDrawdown
11001000%
21201200%
390120-25%
41301300%
580130-38.46%
6125130-3.85%

Risk framing

A drawdown of -38.46% means a future gain of 62.5% is needed from the trough to get back to the prior peak. That is why large losses become progressively harder to recover from.

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Downside Risk

Maximum drawdown calculator guide: worst peak-to-trough loss, drawdown path, and recovery needed

A maximum drawdown calculator measures the worst decline from a prior peak in a chronological value series. That makes it a path-risk metric rather than a simple start-to-end return metric. Two investments can finish at similar levels while having very different maximum drawdowns, which is why drawdown is widely used alongside CAGR, volatility, and total return when comparing risk.

What maximum drawdown is actually measuring

Maximum drawdown asks one specific question: at what point did the series suffer its deepest decline from an earlier running high? The answer depends on the sequence of observations, not just the first and last values. A deep temporary collapse still counts even if the series later recovers.

That is why drawdown is useful for evaluating downside experience. Investors do not live through a neat start-to-end CAGR line. They live through the path in between, and maximum drawdown is a concise way to summarize how bad the worst stretch became before recovery or before the sample ended.

Core drawdown maths

For each point in the series, you compare the current value with the highest value seen so far. That produces a running drawdown figure. Maximum drawdown is simply the most negative drawdown observed across the full path.

The recovery requirement matters because losses are asymmetric. A 20% drop needs a 25% gain to recover. A 50% drop needs a 100% gain. That is why the trough-to-recovery math is often as important as the drawdown percentage itself.

Drawdown_t = ((Value_t - Running peak_t) / Running peak_t) x 100

Measures how far the current value sits below the highest value reached so far in the sequence.

Maximum drawdown = minimum drawdown_t

The worst drawdown in the full series is the most negative running drawdown value.

Recovery gain needed = ((Peak value / Trough value) - 1) x 100

Shows the percentage gain required from the trough to climb back to the previous peak.

How to read the result carefully

A larger negative drawdown means a more severe peak-to-trough loss. The related loss amount shows the absolute drop in the same units as the entered series. Recovery gain needed translates that damage into the gain required to get back to even.

The running drawdown table helps you see where the sequence deteriorated and whether the last value has fully recovered. A series can have a large historical drawdown and still end above the old peak, or it can remain below the peak long after the worst decline occurred.

What this drawdown tool does not do

This calculator evaluates one entered series only. It does not estimate future risk, volatility, VaR, Sharpe ratio, or probability of recovery. It also does not adjust for dividends, fees, cash flows, or inflation unless those are already reflected in the series you enter.

Use it as a path-risk summary, not as a standalone decision rule. A low historical drawdown does not guarantee a low future drawdown, and a recovered drawdown can still mask how difficult the path was for a real investor to hold through.

Further reading

Frequently asked questions

Why is maximum drawdown different from total return?

Total return compares only the start and end points. Maximum drawdown measures the worst loss from a prior high at any point along the path, so it captures downside experience that total return can hide.

 Why does recovery need a bigger gain than the loss?

Because the base becomes smaller after a decline. A 20% loss on 100 leaves 80, and getting back from 80 to 100 requires a 25% gain. The larger the loss, the steeper the required recovery gain.

 Does maximum drawdown predict future downside risk?

No. It summarizes the worst decline in the data you entered. Future drawdowns can be smaller or larger depending on how the series behaves after the sample period.

 Should I enter price-only data or total-return data?

Use the series that matches the question you are asking. If you want to study investor experience after reinvested dividends or after fees, those effects need to be reflected in the values you enter.

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