The Calmar ratio measures return against a strategy’s worst observed loss rather than its overall volatility, a metric many investors find more intuitive for judging real-world pain versus reward.
How it works
Dividing the annualized return by the absolute value of the maximum drawdown gives the Calmar ratio — a higher ratio means more return earned per unit of worst-case loss endured.
What this does not include
This does not include the conventional 36-month rolling window most practitioners use for both figures — it takes the annualized return and maximum drawdown as already-calculated inputs rather than deriving them from a return series.
How to use this calculator
- Enter the annualized return and maximum drawdown.
A worked example
A 15% annualized return against a 20% maximum drawdown: Calmar ratio = 15 ÷ 20 = 0.75.
What the variables mean
| Variable | Meaning |
|---|---|
| Annualized return | The investment’s average annual return |
| Max drawdown | The largest peak-to-trough decline experienced |
Edge cases worth knowing
The Calmar ratio measures return relative to the worst historical loss, not overall volatility. Unlike the Sharpe ratio, which uses standard deviation, this specifically penalizes strategies with large drawdowns, even brief ones.
Zero maximum drawdown makes the ratio undefined — a strategy with no recorded losses has nothing to divide the return by using this specific measure, so the calculator declines to show a result.
Frequently asked questions
How is the Calmar ratio different from the Sharpe ratio?
The Sharpe ratio divides excess return by standard deviation (overall volatility); the Calmar ratio instead divides return by maximum drawdown (the single worst peak-to-trough loss) — a different, often more intuitive way to think about downside risk.
What’s considered a good Calmar ratio?
Ratios above 3 are generally considered strong, though “good” varies significantly by strategy type and the time period measured.
Why use a 3-year window specifically?
It’s a common convention balancing enough history to capture a meaningful drawdown against staying recent enough to reflect current strategy behavior — shorter or longer windows are also used depending on context.
