What Is the Calmar Ratio? Return vs. Drawdown Explained
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
The Calmar ratio divides an investment's annualized return by its maximum drawdown, usually over three years, showing how much yearly return was earned per unit of worst loss.
Key takeaways
- A Calmar ratio of 1.25 means a fund earned 1.25% a year for every 1% of maximum drawdown.
- A fund returning 9% with a 6% drawdown scores 1.50, beating a 12% fund with a 20% drawdown at 0.60.
- Drawdowns measured on monthly data look shallower than daily ones, so mixed-frequency ratios are not comparable.
- The MAR ratio uses the same formula but measures over the full track record instead of three years.
The Calmar ratio is a risk-adjusted performance measure that divides an investment’s annualized return by its maximum drawdown over the same period, typically the most recent three years. It answers one specific question: how much yearly return did a fund or strategy earn for each unit of the worst peak-to-trough loss it suffered? A higher ratio means more return per unit of that worst loss.
How the Calmar Ratio Works
Calculating the Calmar ratio
The formula is:
Calmar ratio = Annualized return ÷ |Maximum drawdown|
Both inputs are measured over the same window:
- Annualized return is the compound yearly growth rate over the period (CAGR). Over three years it is (ending value ÷ starting value)^(1/3) − 1.
- Maximum drawdown is the largest percentage decline from a running peak to a later trough before a new peak is reached. It is expressed as a positive number in the denominator.
Young’s version recalculates the ratio monthly using the trailing 36 months. Recomputing it each month on a moving window produces a rolling Calmar ratio, which shows how the risk-reward profile changed over time rather than giving one figure for a single period.
Interpreting the Calmar ratio
The ratio reads as “annual return earned per 1% of worst drawdown.”
- Above 1: the annualized return exceeded the largest peak-to-trough loss. A ratio of 1.25 means the fund earned 1.25% a year for every 1% of maximum drawdown.
- Exactly 1: return and worst loss were the same size.
- Below 1: the worst loss was larger than one year’s average return. A ratio of 0.915 means annual return was 91.5% of the maximum drawdown.
- Negative: the annualized return was negative over the window.
Very high readings, such as 22, mean the drawdown was tiny relative to return. That usually reflects a short or unusually calm window, smoothed valuations or losses that have not yet occurred in the record. Check how the drawdown was measured before reading a high number as low risk.
There is no universal cutoff for a “good” Calmar ratio. The figure is most meaningful when it is compared across funds or strategies measured over the same window and with the same data frequency.
Why the Calmar Ratio Matters
Volatility measures treat upward and downward swings alike, while many investors care most about how much they could lose from a high point. Maximum drawdown captures that directly: it is the loss an investor would have taken by buying at the worst peak and holding to the worst trough. That makes the Calmar ratio popular in hedge fund and commodity trading advisor (CTA) reporting, and in evaluating systematic trading strategies, where a deep drawdown can trigger redemptions or margin problems.
Example of the Calmar Ratio
Hypothetical example, for illustration only. Two funds are measured over the same three years:
| Fund A | Fund B | |
|---|---|---|
| Annualized return | 12% | 9% |
| Maximum drawdown | 20% | 6% |
| Calmar ratio | 12 ÷ 20 = 0.60 | 9 ÷ 6 = 1.50 |
Fund A earned more each year, but an investor at its worst point was down 20%. Fund B earned less, yet its return per unit of worst loss was two and a half times higher. That makes it a better fit for an investor who could not tolerate a 20% decline.
History of the Calmar Ratio
Terry W. Young, a California fund manager, published the ratio in 1991 in California Managed Account Reports, his newsletter, which gave the measure its name; he also called it the Drawdown ratio. He built it as a variation on the Sterling ratio, which he considered “too sensitive,” and argued that monthly updating made it smoother and more current than yearly measures such as the Sterling and Sharpe ratios.
Limitations of the Calmar Ratio
- One data point for risk. Maximum drawdown is a single episode. Two funds with the same worst loss can have very different paths: one may have dropped once and recovered, the other may have suffered repeated smaller losses.
- Ignores overall volatility. Day-to-day or month-to-month swings that never form the deepest drawdown do not affect the ratio, so it gives a narrower picture of risk than standard-deviation measures.
- Window dependence. Maximum drawdown can only grow as a record lengthens, so a fund with a short history may look better than it would over a full market cycle. Changing the window from 36 months to the full history can change the result sharply.
- Backward-looking. A past drawdown does not cap future losses.
- Data frequency. Drawdowns measured on monthly data look shallower than those measured on daily data for the same fund, so ratios built on different frequencies are not comparable.
Calmar Ratio vs. Related Measures
Sharpe ratio. The Sharpe ratio divides return above the risk-free rate by the standard deviation of returns. It accounts for all volatility, up and down, while the Calmar ratio focuses only on the worst decline.
Sortino ratio. The Sortino ratio also focuses on downside risk, but it uses the standard deviation of negative returns rather than the single largest drawdown. It reflects every losing period, not just the worst one.
Sterling ratio. The Sterling ratio, the Calmar ratio’s parent, divides return by an average of drawdowns rather than the single maximum drawdown.
MAR ratio. The MAR ratio uses the same structure as the Calmar ratio, compound annual return divided by maximum drawdown, but measures both over the full track record since inception instead of a three-year window. The terms are sometimes used interchangeably, which is why it matters which window a reported figure uses.
Total ROI divided by total drawdown. The Calmar numerator is an annualized return, not cumulative return on investment. Using total three-year return would inflate the ratio roughly in proportion to the number of years and make funds with different track-record lengths impossible to compare.
FAQs
Can the Calmar ratio be calculated on active return?
Not in its standard form. The ratio uses a fund's absolute annualized return and its own maximum drawdown. Measuring return relative to a benchmark is a separate concept, covered by measures such as alpha, although an analyst can build a custom drawdown ratio on active returns if the method is stated.
The Bottom Line
The Calmar ratio is most useful to investors comparing hedge funds, CTAs or systematic strategies where a deep loss could force redemptions or margin problems. Compare funds only on the same window and data frequency, and treat very high readings with caution. Because it rests on a single past drawdown, pair it with volatility-based measures such as the Sharpe or Sortino ratio before judging risk.
