Calmar Ratio Calculator

The Calmar ratio measures a fund or portfolio's annualised return relative to its maximum drawdown, giving a risk-adjusted performance measure that penalises large peak-to-trough losses. It is used by investors, hedge fund managers, and quantitative analysts comparing strategies where capital preservation is a priority alongside return.

How to Use the Calmar Ratio Calculator

1. Enter the annualised return of the fund or portfolio as a percentage.
2. Enter the maximum drawdown over the same period as a percentage (use the absolute value, not a negative number).
3. Click calculate to see the Calmar ratio.

The Formula

Calmar Ratio = Annualised Return / Maximum Drawdown

Where maximum drawdown is expressed as a positive percentage. For example, if a portfolio fell from a peak of £100,000 to a trough of £70,000, the maximum drawdown is 30%.

Maximum Drawdown = (Peak Value - Trough Value) / Peak Value x 100

The ratio is typically calculated over a 3-year rolling period, though longer periods give a more complete picture of downside risk.

Real-World Example

Fund A: 3-year annualised return of 15%. Maximum drawdown over the period: 25%.

Calmar ratio: 15 / 25 = 0.60

Fund B: 3-year annualised return of 10%. Maximum drawdown: 8%.

Calmar ratio: 10 / 8 = 1.25

Despite having a lower absolute return, Fund B has a significantly higher Calmar ratio. For every unit of drawdown risk taken, Fund B delivered 1.25 units of return versus 0.60 for Fund A. An investor who cannot tolerate large drawdowns (such as a retiree in the withdrawal phase) would prefer Fund B's profile, even at the cost of lower headline returns.

Calmar Ratio Versus Sharpe Ratio

Both the Calmar and Sharpe ratios are risk-adjusted performance measures, but they use different definitions of risk. The Sharpe ratio uses standard deviation (volatility) of returns as the risk measure, treating upside and downside volatility equally. The Calmar ratio uses maximum drawdown, which focuses exclusively on the worst-case loss from peak to trough. For trend-following strategies and funds that aim to protect capital, maximum drawdown is often a more relevant risk measure than standard deviation, because investors care more about the worst loss they actually experienced than about average volatility. The Calmar ratio is particularly popular in the managed futures and hedge fund space where avoiding catastrophic drawdowns is central to the investment mandate.

Frequently Asked Questions

What is a good Calmar ratio? A Calmar ratio above 1.0 is generally considered good, indicating that the annualised return exceeds the maximum drawdown experienced. Ratios above 2.0 are considered excellent. Most diversified equity funds produce Calmar ratios below 1.0 over periods that include bear markets, because equity drawdowns of 30 to 50% are common while annualised returns over a 3-year window may be in the 8 to 15% range. Trend-following strategies and low-volatility funds often target Calmar ratios above 1.0.

Why is the Calmar ratio typically measured over 3 years? The 3-year lookback period is a practical convention: it is long enough to capture at least one market stress event in most periods, while being recent enough to reflect the current strategy and management team. Longer periods (5 to 10 years) give a more complete history but may include periods that are no longer representative of how the fund is managed. Some analysts calculate the Calmar ratio over the fund's full history to capture the worst drawdown on record.

What are the limitations of the Calmar ratio? The Calmar ratio depends entirely on what happened to have been the maximum drawdown in the measurement window. A fund that avoided a particular crisis (because it launched after it, or was not exposed to it) may show an artificially high Calmar ratio. Conversely, a fund that experienced a large drawdown due to a short-lived event, but quickly recovered, may look worse than its actual risk profile warrants. Like all historical metrics, it does not predict future drawdowns.

How does the Calmar ratio compare to the Sortino ratio? The Sortino ratio uses downside deviation (volatility of negative returns only) as the risk measure, while the Calmar ratio uses maximum drawdown. The Sortino ratio captures the frequency and average size of losses, while Calmar captures the worst single episode of loss. For a comprehensive view, many analysts consider all three: Sharpe (overall volatility), Sortino (downside frequency), and Calmar (worst case).

A constructed 36-month example, worked end to end

The two-fund comparison above uses headline inputs. A reader who wants to reproduce the ratio from a return series can follow this example, which is a constructed equity curve rather than a real track record. It starts at 100.00 and runs for 36 months.

The drawdown is the part the Calmar ratio cares about. The peak was 111.48 at month 18 and the trough was 90.27 at month 21. Maximum drawdown is (111.48 - 90.27) / 111.48, which is 19.02 percent. Recovering from 90.27 back to 111.48 needs a gain of 23.49 percent, because the base is now the lower figure.

The return leg over the same 36 months is 122.14 / 100.00, a total gain of 22.14 percent. Annualised over exactly three years that is 1.2214 to the power of one third, minus one, which is 6.89 percent a year.

A Calmar of 0.36 says the fund gained about a third of a percent of annual return for every percent of peak-to-trough loss it subjected investors to. On the conventional reading that is a weak result: the fund took an equity-like drawdown without delivering an equity-like return.

What the other ratios say about the same series

The same 36 monthly returns produce very different verdicts depending on which risk measure you divide by. This is the clearest argument for reading more than one of them.

Nine of the 36 months were negative, and the worst single month lost 9.40 percent. The Sharpe ratio of 0.75 looks respectable because the denominator is total volatility, and most of the fund's monthly moves were upward. The Calmar ratio of 0.36 looks poor because one concentrated three-month episode dominates the record. Both numbers are correct. They answer different questions, and a fund that has not yet lived through a bad quarter will look better on Calmar than it deserves.

Reading the ratio against a table of funds

The formula is a single division, so the ranking is driven by how far the return and the drawdown are apart.

Fund C returned more than twice what Fund D returned and ranks second from bottom, because it lost 40 percent at the worst point. Fund D returned less than a third of Fund C's return and ranks top. Neither ranking is wrong. Which one matters depends on whether the investor can hold through a 40 percent decline without selling, and for anyone drawing an income from the portfolio the answer is usually no.

What the ratio's two inputs actually measure

The ratio is one line of arithmetic, and the ambiguity sits entirely in how its two inputs are defined. State both when you quote a figure.

The return leg is normally the compound annual growth rate over the measurement window, not the arithmetic average of monthly returns. On this 36-month series the arithmetic average is 0.59 percent a month, which annualises to 7.13 percent by simple multiplication. Compounding gives 6.89 percent. Using the arithmetic figure would raise the Calmar ratio from 0.36 to 0.37 without anything changing in the fund.

The drawdown leg is the largest single peak-to-trough decline in the same window, not the worst rolling 12-month loss. It is always quoted as a positive number, because a negative drawdown in the denominator flips the sign of the ratio and makes a bad fund look good.

Three further points belong with any quoted figure. The risk-free rate does not appear in the formula at all, so the Calmar ratio is unaffected by interest rates while the Sharpe ratio is not. No adjustment is made for the length of time the fund spent underwater, so a fund that recovered in a month and a fund that took four years to recover score identically. And the ratio says nothing about the drawdown that has not happened yet.

Where the ratio and its name come from

Terry W. Young introduced the measure in an article titled "Calmar Ratio: A Smoother Tool", published in the trade journal Futures on 1 October 1991. Young ran a firm called California Managed Accounts and published a newsletter, CMA Reports. The name Calmar is an acronym of that pair: CALifornia Managed Accounts Reports. Young built the ratio for evaluating commodity trading advisors and hedge funds, where long quiet stretches punctuated by sharp equity-curve declines made an average return figure misleading.

A related measure, the MAR ratio, divides the compound annual return since inception by the maximum drawdown since inception. The MAR ratio is named after Managed Account Reports, a separate publication founded in 1979 by Leon Rose. The two are often confused because the names and the arithmetic are so close, and the practical difference is the window: MAR uses the full history, while Calmar uses a trailing period, conventionally 36 months.

Also try these free tools:

• Sharpe Ratio Calculator
• Sortino Ratio Calculator
• Max Drawdown Calculator