Maximum Drawdown Calculator
Enter the peak and trough values of a portfolio or investment to calculate maximum drawdown (MDD), the percentage and dollar loss from the highest point to the deepest low. Optionally enter the expected annual growth rate to estimate how long recovery will take. The calculator shows a worked step panel, a chart of the peak-to-trough journey, and a reference table of historical market drawdowns.
What is maximum drawdown (MDD)?
Maximum drawdown (MDD) is the largest peak-to-trough decline in the value of a portfolio or investment over a specified period, expressed as a percentage. It answers the question: "If I had bought at the worst possible time and sold at the worst possible time, how much would I have lost?" MDD is a core risk metric used by hedge funds, mutual funds, and individual investors to understand downside exposure. Unlike standard deviation, which measures volatility symmetrically, MDD focuses entirely on the worst-case loss sequence, making it especially useful for evaluating the pain tolerance required to hold through a strategy.
Maximum drawdown formula
The formula is: MDD = (Trough Value - Peak Value) / Peak Value. Because the trough is always lower than the peak, the result is always a negative number between -1 (total loss) and 0 (no loss). Multiply by 100 to convert to a percentage. For example, a portfolio that falls from $100,000 to $65,000 has an MDD of ($65,000 - $100,000) / $100,000 = -0.35, or -35%. Note that the trough does not have to be the last data point, and the calculation always looks for the highest peak before the lowest subsequent trough over the entire period.
Why recovery requires a bigger gain than the loss
A 35% drawdown requires a 53.8% gain on the new (lower) base to return to the original peak, not a 35% gain. This asymmetry exists because the base changes: after losing 35% of $100,000 you have $65,000, and 53.8% of $65,000 is exactly $35,000, which brings you back to $100,000. The larger the drawdown, the more severe the asymmetry. A 50% loss requires a 100% gain; a 75% loss requires a 300% gain. This is why limiting drawdown size is one of the most powerful levers in long-run wealth building. The recovery time feature in this calculator makes that asymmetry concrete by showing how many years it will take at a given compound annual growth rate.
How to use maximum drawdown in portfolio management
MDD is most useful as a filter when evaluating strategies or funds. Two funds can share the same average annual return but have very different maximum drawdowns: the one with a larger MDD requires stronger nerves and a longer time horizon to hold through bad periods. Common rules of thumb include: an MDD under 10% is generally considered minor and easily tolerated; 10-20% is moderate and corresponds to typical garden-variety bear-market corrections; 20-40% is significant and historically associated with recessions; above 40% is severe and has historically taken many years to recover. When comparing strategies, the Calmar ratio (annualized return divided by the absolute MDD) gives a risk-adjusted score, with higher values being better.
Historical market maximum drawdowns
| Event | Asset | Approx. MDD | Recovery time |
|---|---|---|---|
| Great Depression (1929-1932) | Dow Jones | -89% | ~25 years |
| Dot-com crash (2000-2002) | NASDAQ | -78% | ~15 years |
| Global financial crisis (2007-2009) | S&P 500 | -57% | ~5 years |
| COVID-19 crash (Feb-Mar 2020) | S&P 500 | -34% | ~6 months |
| Bitcoin bear market (2017-2018) | BTC/USD | -83% | ~3 years |
| Russian invasion impact (2022) | MSCI EM | -25% | Ongoing (2026) |
| Typical annual equity pullback | Various | -10% to -15% | Weeks to months |
Notable drawdowns from major indices and assets. Recovery times assume reinvested dividends and approximate CAGR.
Frequently asked questions
What is a good maximum drawdown percentage?
It depends on your risk tolerance and time horizon. A drawdown under 10% is generally considered minor. Between 10% and 20% is moderate and normal for diversified equity portfolios over a market cycle. Above 30% is significant and may indicate a concentrated or leveraged position. Many institutional investors target strategies with an MDD below 20% to stay within risk mandates, but equity-heavy long-term portfolios regularly see drawdowns of 30-50% during bear markets.
Why does recovery require a larger gain than the loss?
Because the percentage is calculated on a smaller base after the loss. If a portfolio drops 50% from $100 to $50, you need a 100% gain on the $50 to get back to $100. The math is: gain needed = (1 / (1 - drawdown)) - 1. For a 35% drawdown, that is (1 / 0.65) - 1 = 53.8%.
How long does it take to recover from a drawdown?
Recovery time depends on the size of the drawdown and the subsequent growth rate. Using the formula n = ln(peak/trough) / ln(1 + CAGR), a 35% drawdown recovering at 10% per year takes about 4.4 years. A 50% drawdown at 10% takes about 7.3 years. Historical examples vary widely: the S&P 500 recovered from the 2020 COVID crash in about six months, while the NASDAQ took roughly 15 years to recover from the 2000 dot-com peak.
Is maximum drawdown the same as volatility?
No. Volatility (usually measured by standard deviation) captures how much returns vary both up and down around the average. Maximum drawdown only measures the worst sequential decline from a peak. A strategy can have moderate volatility but a large MDD if the losses cluster together in a single prolonged bear market. MDD is a downside-only, path-dependent metric.
What is the Calmar ratio and how does it use MDD?
The Calmar ratio is the annualized return divided by the absolute value of the maximum drawdown over the same period. For example, a fund returning 12% per year with a maximum drawdown of 20% has a Calmar ratio of 0.6. Higher is better. It is a compact way to see how much return you earned per unit of worst-case loss, making it useful for comparing funds with different risk profiles.