Calmar Ratio Divides Your Return by Your Worst Drawdown. Here's Why That Catches What Sharpe Misses
6 min read
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6 min read
Two portfolios both post a Sharpe ratio of 1.2 this year. On paper, that makes them look like the same investment wearing two different tickers.
Then you check how far each one actually fell from its best moment before recovering. One dropped 7%. The other dropped 17%. Same Sharpe ratio, more than double the pain. The Calmar ratio is the number built specifically to catch that gap, and it is not the same number as Sharpe measuring the same thing twice.
The Calmar ratio divides a portfolio's annualized return by its maximum drawdown, the worst peak-to-trough fall it suffered over the same period.
Annualized return ÷ Maximum drawdown
If you need a refresher on what maximum drawdown means on its own, it is covered in full here: the short version is that it is the drop from your portfolio's highest point to its lowest point after that, not from wherever you happened to buy in.
The Calmar ratio was created by Terry W. Young, who ran a California-based fund manager called California Managed Accounts, and published in the trade journal Futures in 1991. Its name is an acronym of his firm's own newsletter, CMA Reports: CALifornia Managed Accounts Reports. Young built it for commodity trading advisors and hedge funds, using a trailing 36-month annualized return over the maximum drawdown in that same 36-month window, recalculated every month rather than once a year like some older risk ratios.
You do not need 36 months of history to find the idea useful. The logic works over any period you choose, which is what makes it worth checking alongside your Sharpe ratio, not instead of it.
Sharpe ratio is built from two numbers: the average of your returns, and how spread out they are around that average. Both of those only care about the set of monthly returns you had. They do not care what order those months happened in.
Maximum drawdown cares about nothing else. It is entirely about order, because a portfolio's worst fall depends on which bad months landed next to each other, not just how many bad months there were in total.
That difference means the exact same set of monthly returns can produce an identical Sharpe ratio and a completely different Calmar ratio, just by rearranging when the losses hit.
Here is an illustrative set of six monthly returns, used purely to show the mechanics: +10%, +8%, +6%, −5%, −6%, −7%. Two hypothetical portfolios experience the exact same six percentages. The only difference is the order they arrive in.
Portfolio A gets the gains and losses interleaved: +10%, −5%, +8%, −6%, +6%, −7%.
Portfolio B gets all three gains first, then all three losses: +10%, +8%, +6%, −5%, −6%, −7%.
| Portfolio A | Portfolio B | |
|---|---|---|
| Monthly returns (same six numbers) | Interleaved | Gains, then losses |
| Cumulative return over 6 months | +4.58% | +4.58% |
| Annualized return | ~9.4% | ~9.4% |
| Volatility of monthly returns | Identical | Identical |
| Sharpe ratio | Identical | Identical |
| Maximum drawdown | −7.3% | −17.0% |
| Calmar ratio | ~1.29 | ~0.55 |
Multiplying the same six numbers together always gives the same product, no matter what order you multiply them in, so both portfolios end at exactly the same cumulative return. The standard deviation of the same six numbers is also identical regardless of order, so Sharpe ratio, which is built only from the average and the spread of returns, cannot tell these two portfolios apart at all.
Maximum drawdown tells a completely different story. Portfolio A's three gains cushioned its losses along the way, so its worst fall from a peak was only 7.3%. Portfolio B stacked all three losses back to back after building up a bigger peak first, so it fell 17.0% from that peak before recovering, more than twice as deep. The Calmar ratio, which divides the same annualized return by each portfolio's own maximum drawdown, scores Portfolio A at roughly 1.29 and Portfolio B at roughly 0.55, more than double the difference Sharpe ratio was structurally unable to show.
There is no single official pass mark, since the "right" Calmar ratio depends heavily on the asset class and the period measured, but a few working bands are common among funds that publish it.
Above 3.0. Considered strong for a track record covering a full market cycle. Uncommon outside disciplined, drawdown-aware strategies.
Between 1.0 and 3.0. A solid, workable range: meaningful annualized return relative to the worst single drawdown endured.
Below 1.0. The annualized return did not comfortably clear the worst drawdown. Worth asking whether the strategy's downside is proportionate to what it actually earned.
Because the classic definition uses a rolling 36-month window, a Calmar ratio computed over a short or unusually calm stretch can flatter a portfolio that has never really been tested. The same caution applies to Sharpe ratio, and it applies here too: longer, harder windows are more honest than short, easy ones.
Calmar ratio only ever looks at the single worst drawdown in the window you measure. A portfolio that had one brutal month and was otherwise smooth scores the same, on that measure alone, as a portfolio that ground through many medium-sized drawdowns of a similar depth, even though the second one may have been far more exhausting to actually hold.
It also inherits the same blind spot every backward-looking risk ratio has: it describes what already happened, not what is guaranteed to happen again. A strategy that has never faced a genuine crisis can carry a flattering Calmar ratio purely because its worst test has not arrived yet.
That is why Calmar ratio works best read next to, not instead of, Sharpe ratio and maximum drawdown on their own. Three angles on the same return series catch more than any single one of them alone.
You need two numbers: your annualized return over the period you care about, and your maximum drawdown over that same period, the worst peak-to-trough fall your actual portfolio value experienced. Divide the first by the size of the second.
NetWort computes maximum drawdown from your real transaction and valuation history, not from a tidied assumption about when you invested, which matters for the same reason it matters for your real, cash-flow-weighted return rather than a broker's headline percentage.
Your maximum drawdown sits in the Portfolio Health section of your dashboard, next to Sharpe ratio, volatility and beta. Pull up your own annualized return and drawdown side by side there, do the division yourself, and see where your own portfolio actually lands versus the bands above. If your Sharpe ratio looks fine but your drawdown was deep, the Calmar ratio is the number that will show it.
For the current BI Rate and the broader rate backdrop that any return figure sits against, see the macro context page.