The Calmar Ratio measures a strategy's return relative to its worst historical drawdown:
Calmar = Annualized Return / |Maximum Drawdown|
A higher Calmar Ratio indicates better return per unit of drawdown risk. Unlike the Sharpe Ratio (which penalizes all volatility equally), the Calmar specifically targets tail risk: the worst loss a strategy experienced from peak to trough over the measurement period.
The ratio is particularly relevant for strategies that generate steady positive returns punctuated by large drawdowns — a profile that may look good on Sharpe but is unacceptable if the drawdown would trigger redemptions or breach risk limits.
Limitations
- Period sensitivity — a strategy never tested through a full market cycle will have a misleadingly high Calmar Ratio.
- Single observation — maximum drawdown is one historical data point, not a forward-looking estimate of worst-case loss.
- Compare alongside the Sortino Ratio and Maximum Drawdown for a fuller picture of downside risk.