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What Is Calmar Ratio? Measuring Return vs. Worst-Case Drawdown

· 2 min read
Vaanam
Vaanam
Build, Backtest, and Screen Trading Strategies

The Calmar Ratio answers a simple question: is the return worth the pain? It divides your annualized return by the worst drawdown you experienced.

The Formula​

Calmar Ratio = CAGR / Max Drawdown

That's it. Two numbers you probably already have from any backtest.

Example: Strategy has a CAGR of 7.75% and a max drawdown of 15.26%.

Calmar = 7.75% / 15.26% = 0.51

For every 1% of max drawdown, you earned about 0.51% annually.

How to Read It​

Calmar RatioInterpretation
Below 0.5Return doesn't justify the drawdown
0.5–1.0Acceptable
1.0–2.0Strong — good return for the risk
2.0+Excellent (double-check it's not overfitted)

Why Calmar Is Practical​

Unlike Sharpe and Sortino, Calmar uses max drawdown — something every trader viscerally understands. You don't need to think about "standard deviation of returns." You just ask yourself:

"Would I sit through a 15% drawdown to earn 7.75% per year?"

That's the Calmar ratio in human terms.

The Catch​

Max drawdown is a single worst-case event. If your strategy had one bad month in 20 years, that one month dominates the Calmar ratio forever. It doesn't tell you about the typical drawdown experience.

For this reason, some traders also look at the average drawdown or drawdown duration alongside Calmar.

Key Takeaway​

Calmar ratio is the most intuitive risk-adjusted metric because it directly compares return to worst-case pain. If Calmar is below 0.5, the strategy probably isn't worth the stress. Above 1.0, you're getting well-compensated for the risk.