What Is the Calmar Ratio?
The Calmar ratio is a risk-adjusted performance measure that divides a fund’s compound annual growth rate (CAGR) by the absolute value of its maximum drawdown — the largest peak-to-trough decline it has experienced. It answers a specific question: how much annualized return did this strategy generate relative to the worst loss an investor would have had to sit through to earn it?
The Formula
Calmar Ratio = CAGR / |Maximum Drawdown|. Both figures are typically calculated over the same lookback period, commonly the trailing 36 months, though it can be computed over a fund’s full history. A higher Calmar ratio means more annualized return was earned per unit of the worst historical loss.
A Worked Example
Consider two funds. Fund A has compounded at a 12% CAGR but suffered a maximum drawdown of -20% at its worst point. Fund B compounded at a lower 9% CAGR but its maximum drawdown was only -10%. Fund A’s Calmar ratio is 12 / 20 = 0.60. Fund B’s Calmar ratio is 9 / 10 = 0.90. Even though Fund A has the higher raw return, Fund B’s Calmar ratio is higher, meaning it delivered more return relative to the worst loss an investor had to endure.
Why Drawdown-Based Metrics Matter
Standard deviation-based metrics like the Sharpe ratio treat all volatility — both up and down moves — as equally undesirable. In practice, investors do not experience a sharp rally as painful the way they experience a sharp decline. The Calmar ratio focuses specifically on the single worst loss a strategy has produced, which tends to align more closely with what actually causes investors to panic-sell or redeem from a fund.
Calmar vs. Sharpe vs. Sortino
| Metric | Risk Measure Used | What It Penalizes |
|---|---|---|
| Sharpe Ratio | Total standard deviation | All volatility, up and down |
| Sortino Ratio | Downside deviation only | Volatility below a target return |
| Calmar Ratio | Maximum drawdown | The single worst peak-to-trough loss |
Frequently Asked Questions
Who typically uses the Calmar ratio?
It is especially common among managed futures funds, commodity trading advisors (CTAs), and hedge funds, where investors care heavily about tail losses and capital preservation, in addition to raw returns.
What counts as a ‘good’ Calmar ratio?
There is no universal threshold, since it depends on asset class and strategy type, but a Calmar ratio above 1.0 (meaning CAGR exceeds the maximum drawdown) is generally viewed as strong, while ratios below 0.5 suggest the strategy’s worst loss has been large relative to what it has earned.
Does the Calmar ratio account for how often drawdowns happen?
No. It only looks at the single deepest drawdown over the measurement period, not how frequently smaller drawdowns occur or how long they last — that is a limitation worth pairing with other measures like average drawdown or recovery time.
Can the Calmar ratio be negative?
Yes, if the CAGR itself is negative over the measurement period. A negative Calmar ratio simply reflects that the strategy lost money on a compound annualized basis during that window.
Key Takeaways
The Calmar ratio measures return per unit of a strategy’s worst historical drawdown, making it a useful complement to Sharpe and Sortino ratios for investors who care specifically about how deep the losses got, not just how volatile the returns were. This article is for informational purposes only and does not constitute investment advice.
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