What is the Calmar Ratio?

By EC Assets Research Team · Published 19 August 2026 · Updated 19 August 2026

Calmar Ratio: Annualised return divided by maximum drawdown, conventionally over 36 months. Where Sharpe measures return per unit of dispersion, Calmar measures it per unit of worst realised loss - the number an investor actually had to sit through.

What the Calmar Ratio Measures

The Calmar ratio divides compounded annual return by the deepest peak-to-trough loss over the same period. A strategy returning 12 percent a year with a 20 percent maximum drawdown scores 0.6.

Its appeal is that the denominator is something an investor experienced rather than something a statistician computed. Volatility describes how widely returns scattered; maximum drawdown describes the single worst stretch the capital actually lived through. Redemptions, margin calls and lost mandates follow the second, not the first.

The measure was introduced by Terry Young in 1991 and named after his firm's newsletter, California Managed Account Reports. It was built for managed futures, where deep drawdowns are routine and dispersion alone flattered the strategies.

How It Works

$$\text{Calmar} = \frac{\text{CAGR}}{|\text{Maximum Drawdown}|}$$

Both terms are usually taken over a trailing 36-month window, which is the convention that makes published figures comparable. Some houses compute it over the full track record; some use the Sterling ratio, which averages several large drawdowns instead of taking only the worst, or the MAR ratio, which is the same calculation over the whole history.

Two managers, same Sharpe, different experience

Manager B wins on both return and Sharpe. An investor who joined at B's peak waited through a loss more than twice as deep, and the compounding base from which the recovery had to start was correspondingly lower.

Worked Example

A fund compounds at 12 percent a year and its worst peak-to-trough loss over the measurement window is 20 percent:

$$\text{Calmar} = \frac{12%}{20%} = 0.60$$

Read the number as: for every point of worst-case loss endured, the strategy delivered 0.6 points of annual return. A figure above 1.0 is strong; below 0.5 the drawdown is doing more work than the return.

The asymmetry behind the denominator is why it deserves attention. The 20 percent drawdown required a 25 percent gain merely to return to the previous high; a 40 percent drawdown would have required 67 percent. Drawdown does not just interrupt compounding, it resets its base.

When It Applies (and Limitations)

The denominator is a single observation. Volatility summarises hundreds of data points; maximum drawdown is one event. That makes the ratio extremely noisy - one bad fortnight determines it for three years, and a manager whose worst period happened to fall just outside the window scores far better than an identical manager whose did not.

It falls mechanically with track length. The longer the record, the deeper the worst drawdown is likely to be, simply because there was more opportunity for one. Comparing a three-year Calmar with a ten-year Calmar rewards the shorter record.

It ignores the risk-free rate. The classic formula uses raw return, not excess return, so Calmar ratios earned at 5 percent cash rates are not comparable with those earned at zero without adjustment.

It says nothing about duration. Two strategies with identical 20 percent drawdowns are not equivalent if one recovered in four months and the other in three years. Time-under-water is the complementary measure and is not captured here.

It rewards the untested. A strategy that has never met its adverse regime shows a shallow maximum drawdown and a flattering Calmar. This is most acute for short-volatility and carry strategies, whose worst outcome is rare by construction.

Why It Matters for Institutional Investors

It matches the redemption decision. Allocators exit on drawdown, not on volatility. A measure whose denominator is the trigger for that decision describes the real constraint better than one built on dispersion.

It is the right lens for path-dependent liabilities. An institution funding a spending programme cannot simply wait out a drawdown; it withdraws during one, which converts a paper loss into a permanent one. Drawdown-based measures speak to that directly.

It complements rather than replaces Sharpe. Sharpe rewards steadiness, Calmar penalises the worst episode, Sortino ignores upside dispersion. Read together they describe the shape of a return stream; read alone, each can be gamed by a strategy tuned to it.

It exposes the leverage question. Because both numerator and denominator scale roughly with leverage, Calmar is fairly stable across leverage levels - which makes an unusually high figure a prompt to ask whether the drawdown window simply missed the strategy's bad regime.

References

1. Young, T. W. (1991). Calmar Ratio: A Smoother Tool. Futures Magazine, 20(1).
2. Bacon, C. R. (2008). Practical Portfolio Performance Measurement and Attribution (2nd ed.). Wiley.
3. Magdon-Ismail, M., & Atiya, A. F. (2004). Maximum Drawdown. Risk, 17(10), 99–102.
4. Ang, A. (2014). Asset Management: A Systematic Approach to Factor Investing. Oxford University Press.