Concept
Calmar Ratio
Calmar Ratio is a Performance, Backtesting & Validation concept. First implementations are in the build queue: the write-up leads, the indicators follow.
What is the Calmar ratio?
The Calmar ratio is a risk-adjusted performance measure that divides a strategy's annualized return by the absolute value of its maximum drawdown over the same period. It answers a blunt, practical question: how much yearly growth did the strategy earn for the worst peak-to-trough loss an investor had to sit through? The measure was popularized by Terry W. Young in 1991, with the name derived from his California Managed Account Reports publication, and it was originally computed over a rolling 36-month window.
The ratio exists because volatility-based measures like the Sharpe ratio treat upside and downside variability symmetrically, while most traders experience risk as drawdown: the depth of the hole and the time spent in it. By putting maximum drawdown in the denominator, the Calmar ratio scores strategies by the pain metric practitioners actually feel, which is also the metric that triggers investor redemptions and prop-firm violations.
Traders care because a Calmar comparison quickly separates smooth compounders from strategies whose returns came with account-threatening holes. Its main weakness is that maximum drawdown is a single worst event: an estimate built on one data point is noisy, heavily dependent on the window length, and tends to worsen as the track record grows simply because more time allows deeper drawdowns to occur.
How it's calculated
The standard form divides annualized return by the worst drawdown of the measurement window.
The original convention used a trailing 36-month window; many backtest reports instead use the full track record, which produces systematically different values.
Some implementations subtract a risk-free rate from the numerator; most retail backtesting tools do not.
The closely related MAR ratio uses the same formula over the entire track record.
How traders use it
- Strategy comparison: when two systems have similar returns, the higher Calmar identifies the one that earned them with a shallower worst-case hole, which matters for leverage decisions and investor tolerance.
- Leverage budgeting: because maximum drawdown scales roughly with position size, the Calmar ratio helps estimate how much a strategy can be levered before the projected worst drawdown becomes unacceptable.
- Managed futures evaluation: the ratio remains a standard reporting figure for CTAs and hedge funds, typically on a 36-month basis, making cross-fund comparison straightforward.
- Limitations: the denominator is one historical event, so the ratio is unstable across windows, blind to how long drawdowns lasted, and comparisons are only fair when both strategies are measured over identical periods and similar lengths.
Calmar ratio vs. related concepts
Sharpe Ratio: Sharpe penalizes all volatility, including upside; Calmar penalizes only the single worst drawdown. Sharpe is statistically more stable, Calmar closer to felt risk.
Martin Ratio: The Martin ratio divides return by the Ulcer Index, which averages the depth and duration of all drawdowns rather than only the deepest one, making it less dependent on a single event.
Extended Risk-adjusted Ratios: The MAR, Sterling, and Burke ratios are Calmar's close relatives, differing in window convention and in whether they use one drawdown, an average, or a sum of squared drawdowns.
Related concepts · Return/risk metrics
Concept family
Performance, Backtesting & Validation
30 concepts mapped · 30 in the Library
Calmar Ratio FAQ
What is a good Calmar ratio?
Context matters, but over multi-year windows many practitioners regard values above roughly 1 as solid and above 3 as excellent. Short backtests routinely show inflated values that do not survive live trading.
What is the difference between the Calmar and MAR ratios?
Both divide annualized return by maximum drawdown. The traditional distinction is the window: Calmar was defined on a trailing 36 months, while MAR uses the full track record since inception. In casual use the names are often interchanged.
Why does my Calmar ratio drop as my backtest gets longer?
Longer histories give drawdowns more chances to set a deeper record while the annualized return stays roughly stable, so the ratio tends to drift down with track-record length. This is a property of the metric, not necessarily strategy decay.
Can the Calmar ratio be gamed?
Yes. Choosing a lucky window that excludes the worst drawdown, or reporting in-sample results tuned to minimize the historical max drawdown, inflates it. Out-of-sample verification and multiple-window reporting reduce the risk of being misled.
Build Calmar Ratio your way.
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