Maximum Drawdown Calculator

Frequently Asked Questions

What is maximum drawdown?

Maximum drawdown is the largest peak-to-trough percentage decline in a portfolio or equity curve before a new high is reached. It measures the worst-case loss an investor would have experienced during a given period. Unlike volatility, it focuses on the realised pain of a sustained decline rather than average dispersion.

Why does the recovery requirement exceed the drawdown?

A 50% loss needs a 100% gain to recover, because gains compound on a smaller base. The calculator shows the exact gain required.

How is it different from volatility?

Volatility measures dispersion in both directions; max drawdown captures the worst realised loss path, which is what investors emotionally and financially endure.

What is an acceptable max drawdown?

It depends on risk tolerance and strategy, but many investors are uncomfortable beyond 20–30%. Compare it against expected return to judge the trade-off.

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Estimates only. Not investment advice.

Investment Disclaimer: Estimates only. Not investment advice.

This calculator provides estimates for educational purposes only and is not investment advice. Past performance does not guarantee future results. Consult with a qualified financial advisor before making investment decisions. All investments carry risk, including potential loss of principal.

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How This Calculator Works

Maximum drawdown (MDD) is the largest peak-to-trough decline in an equity curve before a new high is made. The algorithm walks the value series once, tracking the running peak; at each point it computes the percentage drop from that peak, (Value − Peak) ÷ Peak, and remembers the worst one. It then reports the peak value and index, the trough value and index, the drawdown duration (number of periods from peak to trough), and whether the series later climbed back to the old peak (recovery status). If you supply an annualized return it also computes the Calmar ratio = annual return ÷ |max drawdown|, a reward-to-pain measure widely used to compare managed-futures and hedge-fund track records. Unlike volatility, drawdown captures the path-dependent, emotional reality of losing money: it is the number that determines whether an investor abandons a strategy at the bottom.

Worked Numeric Example

Series: 100, 108, 115, 102, 95, 88, 97, 110, 120, 105, 118, 130. The running peak reaches 115 at period 3, then the series falls to a trough of 88 at period 6. Drawdown = (88 − 115) ÷ 115 ≈ −23.5%, the worst point in the path. Peak-to-trough duration is 6 − 3 = 3 periods. The value first exceeds 115 again at period 8 (120), so recovery took 2 periods past the trough. With a 12% annual return, Calmar ≈ 12 ÷ 23.5 ≈ 0.51.

Real-World Use

Allocators screen funds on max drawdown before return, because the recovery math is brutally asymmetric: a strategy that drops 50% needs a 100% gain just to break even, and a 25% drop needs 33%. CTAs and trend followers report Calmar (or the closely related MAR ratio) on tear sheets, and many institutional mandates impose a hard drawdown stop that liquidates the manager if breached. Retirement planners use historical drawdown to stress-test withdrawal plans - sequence-of-returns risk is essentially a drawdown problem occurring at the worst possible time, when a retiree is also drawing income from a shrinking balance, which permanently impairs the portfolio in a way the headline average return never reveals. Behaviorally, max drawdown is also the single best predictor of whether an investor will capitulate and sell at the bottom, locking in the loss the math says they only needed to wait out.

Common Mistakes

Confusing the longest drawdown with the deepest - this tool reports the deepest; a shallower decline can last far longer.

Comparing drawdowns over different sample lengths; longer histories almost always show larger MDD.

Ignoring that recovery time, not just depth, drives investor behavior and withdrawal sustainability.

Treating a single historical MDD as the worst possible; the realized maximum is just one draw from the distribution and the future can always be worse.

Annualizing the return for Calmar but measuring drawdown over a short window, which flatters the ratio.

Limitations & Related Tools

MDD is backward-looking and acutely sensitive to the observation window and data frequency: daily marks reveal deeper intra-period drawdowns than monthly marks, and a longer history almost mechanically produces a larger maximum, so cross-fund comparisons are only fair over identical periods and frequencies. It is a single realized number with no confidence interval, says nothing about the probability of a deeper future drop, and treats one catastrophic path and one merely uncomfortable path with the same headline figure if their depths happen to match. Pair it with the Sortino and Sharpe ratios for return-per-risk context, the Calmar ratio for reward-to-pain, and a position size calculator to bound forward drawdown before it happens. These outputs are educational estimates, not investment advice; past performance does not predict future results.

Maximum Drawdown Calculator

Frequently Asked Questions

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