Calmar ratio explained: drawdown-adjusted return definition
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
The Calmar ratio divides a strategy’s annualised return by its maximum drawdown over a defined period, usually three years. A higher figure indicates more return earned per unit of peak-to-trough loss. Traders and allocators use it to compare strategies where deep drawdowns matter more than day-to-day volatility.
What is Calmar ratio?
The Calmar ratio is a risk-adjusted performance metric developed by Terry Young in 1991. It is calculated by dividing a strategy’s compound annual growth rate by the absolute value of its maximum drawdown across the same window, conventionally 36 months. Unlike the Sharpe ratio, which penalises all volatility including upside, the Calmar focuses purely on the worst peak-to-trough decline. This makes it particularly relevant for trend-following systems, managed futures programmes and discretionary macro books where tail losses, rather than daily standard deviation, drive investor redemptions and capital impairment.
How traders use Calmar ratio
Retail systematic traders calculate the Calmar ratio when backtesting strategies to compare candidate systems on equal footing. A swing model returning 18 percent annually with a 12 percent max drawdown produces a Calmar of 1.5, which the desk would rank above a competing system at 25 percent return paired with a 30 percent drawdown. Institutional allocators, particularly funds of funds and CTAs, screen managers using rolling 36-month Calmar figures because investor capital tends to leave during drawdown phases, not volatility spikes. A reading above 1.0 is generally considered acceptable for diversified strategies, above 3.0 is strong, and above 5.0 warrants scepticism about curve-fitting or insufficient sample size. Pair the Calmar with trade count and out-of-sample testing before allocating risk capital.
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Worked example of the Calmar ratio
Consider a trend-following strategy traded over three years. The system compounds at 22 percent annually and experiences its worst peak-to-trough loss of 14 percent during a choppy quarter. The Calmar ratio is 22 divided by 14, giving 1.57. Compare this to a higher-octane breakout strategy returning 35 percent annually but with a 28 percent drawdown during the same window. Its Calmar is 1.25. Despite the second system’s superior headline return, the first delivers more return per unit of capital pain, which is what survives investor scrutiny and position-sizing constraints in live trading.
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Frequently asked
What is a good Calmar ratio?
A Calmar above 1.0 is generally considered acceptable, meaning annualised return exceeds maximum drawdown. Readings between 1.0 and 3.0 are typical for well-diversified managed futures and macro strategies. Anything above 3.0 is strong, and figures above 5.0 in backtests usually indicate curve-fitting, insufficient sample length, or a strategy that has not yet experienced its true worst-case drawdown. Live trading tends to compress backtested Calmar figures meaningfully.
How is the Calmar ratio different from the Sharpe ratio?
The Sharpe ratio divides excess return by standard deviation of returns, penalising all volatility including upside spikes. The Calmar ratio divides annualised return by maximum drawdown, focusing solely on the worst peak-to-trough loss. Strategies with skewed return distributions, like trend following or option selling, can show similar Sharpe figures but very different Calmars. The desk uses both metrics because they capture different aspects of risk.
What time period does the Calmar ratio use?
The conventional Calmar ratio uses a 36-month rolling window, balancing statistical relevance with adaptiveness to current market conditions. Some practitioners compute it over the full strategy history for backtests, while others use shorter 12-month windows for monitoring live performance. Shorter windows react faster to recent drawdowns but suffer from small-sample noise. The original definition by Terry Young specified 36 months as the standard.
Can the Calmar ratio be negative?
Yes. If a strategy produces a negative annualised return over the measurement period, the Calmar ratio becomes negative, since maximum drawdown is always expressed as a positive number in the denominator. A negative Calmar indicates the strategy has lost money during the window and is generally treated as a disqualifying signal by allocators. Traders should also be wary of strategies showing zero or undefined Calmars due to no recorded drawdown in a short sample.
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Educational analysis only. Past performance does not guarantee future results. Manage risk against your own portfolio.
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