Reading Maximum Drawdown: The Risk Number Behind the Return
Two strategies with the same return can be worlds apart. Maximum drawdown is often the number that separates them.
When people compare strategies, they usually start with the return. But two strategies that returned the same amount over a decade can feel completely different to live through. Maximum drawdown is often the number that captures that difference.
What maximum drawdown measures
Maximum drawdown is the largest peak-to-trough decline over a period — the worst drop from a high-water mark to a subsequent low before a new high is reached. If a portfolio climbs to 100, falls to 65, and later recovers, its maximum drawdown over that stretch was 35%.
It answers a very human question: how bad did it get? A strategy's average return says nothing about the moment, halfway through, when it was down a third and you had to decide whether to hold on.
Why it matters as much as return
Returns compound, but so does the temptation to abandon a plan at the bottom. A deep drawdown is where real investors sell — locking in the loss and missing the recovery. A strategy you cannot hold through does not earn you its backtested return, no matter how good the final number looks.
Drawdown also frames recovery math. A 50% decline requires a 100% gain just to break even. The deeper the hole, the more work it takes to climb out — which is why controlling the downside often matters more than chasing the last few points of upside.
Reading it alongside other metrics
Maximum drawdown is most useful in context:
- Next to return, it shows what the gains cost in stress.
- Next to volatility, it distinguishes a strategy that wobbled from one that fell off a cliff once.
- Next to the Sharpe ratio, it grounds an abstract risk-adjusted number in a concrete, feel-it-in-your-stomach figure.
Compare it yourself
The clearest way to internalize drawdown is to watch it happen. The backtester below charts an equity curve against a benchmark and reports the maximum drawdown for each. Try a defensive preset versus a more aggressive one over the same window and compare not just where they ended up — but how far each one fell along the way.