Calculator
Sortino Ratio Calculator
Sortino Ratio Calculator
Sortino Ratio
0.70
Avg Annual Return
9.00%
Years Below Target
2 of 6
Downside Analysis
A Sortino ratio of 0.70 is reasonable: the portfolio averaged 9.00% against 6.46% downside deviation from the 4.5% target. The asymmetry matters — volatility to the upside helped your returns while only the 2 below-target years counted against the ratio.
*The Sortino ratio is a backward-looking statistic based on the return sample you enter. A short history, or one dominated by a single unusual period, can distort the reading. Past downside behaviour does not guarantee future results.
Risk Measured by Pain, Not Wobble
The Sharpe ratio penalises every kind of volatility equally, including violent rallies to the upside. The Sortino ratio, developed by Frank Sortino in the 1990s, fixes that blind spot by counting only downside risk, meaning returns that fall below a target or minimum acceptable return. An investment that spikes forty per cent upward is rewarded fully; one that dips below your floor is penalised. For any investor whose real question is how badly can this hurt me rather than how bumpy is it, Sortino is the cleaner measure. The distinction matters hugely for Australian investors comparing options with very different return shapes. A covered-call income fund and a growth ETF can produce identical volatility, but the covered-call fund's pain is capped while the growth fund's tail is deep, and Sortino reveals which one you are actually being compensated for. It is also the right yardstick for retirement income portfolios, where missing the spending floor is what genuinely damages the plan. By setting your target to your required return, often the RBA cash rate or a term deposit rate, the ratio answers directly: for every unit of below-target pain I accepted, how much extra return did I earn?
Downside Deviation and Target Returns
Sortino is computed as the average return minus the target return, divided by downside deviation. The numerator is simple: the excess return earned over the minimum acceptable return, often called the MAR. The denominator is where the method differs from Sharpe. Downside deviation takes each year's shortfall below the target, with years above the target counting as zero shortfall rather than as volatility, squares those shortfalls, averages them across all years, and takes the square root. Years that beat the target contribute nothing to the risk number at all. Two consequences follow. First, upside surprise genuinely improves the ratio, because it raises average return without touching downside deviation. Second, the ratio is only as sensible as the target you choose: a target equal to the cash rate measures compensation over term deposits, while a target equal to your required spending withdrawal measures whether the portfolio can actually fund your life. When no year falls below the target, downside deviation is zero and the ratio is undefined at the ideal end of the scale. Like all return ratios, Sortino assumes the sample history is representative, so short windows or calm samples flatter the number.
Expert Insights
Set the Target to What You Actually Need
The most common mistake with Sortino is defaulting to the cash rate when the portfolio's real job is funding a specific life. A retiree drawing five per cent should measure against five per cent, because any year the portfolio falls short of that is a year the plan itself is threatened. Growth investors saving for a distant goal can legitimately use the cash rate as their floor. Choose the target that matches the money's purpose, and the ratio will speak to your actual risk rather than an abstract benchmark.
Sortino Flatters Steady Payers, Fairly
Income strategies built on covered calls, mortgage funds and bond ladders often show modest Sharpe ratios because their upside is capped, yet excellent Sortino ratios because they rarely breach their floors. That asymmetry is genuine information, not statistical flattery: if your goal is reliable income with minimal downside, the strategy delivering it deserves the better grade. The trap is applying that grade to growth money, where capped upside becomes the very risk that matters.
Demand a Full Cycle Before Trusting Any Ratio
Downside deviation needs down years to measure anything, so a five-year bull run produces ratios built on almost no evidence. Insist on samples spanning at least one genuine bear market, ideally both the 2020 crash and the 2022 rate-driven drawdown for Australian portfolios. A fund that only ever shows you calm-weather Sortino numbers is asking you to buy insurance it has never been asked to pay out on.
Actionable Tips
- 1
Run Sortino Alongside Sharpe, Never Alone
The gap between a fund's Sharpe and Sortino ratios is itself a diagnostic: a much higher Sortino means the volatility is concentrated in upside years, while similar values signal symmetric risk. Compute both from the same return history and let the comparison reveal the shape of returns that either number alone hides. Funds whose Sortino dramatically beats their Sharpe deserve a closer look at how they generate their returns.
- 2
Audit Your Own Portfolio, Not Just Funds
Enter your personal annual returns, computed from year-end balances including distributions, rather than relying on published fund figures. Your lived returns carry your contribution timing and behavioural decisions, and your personal downside deviation is the risk you actually experienced. Improving it, through steadier habits or better allocation, shows up directly in the ratio, giving you a concrete metric to manage your own behaviour against.
- 3
Re-Test Retirement Portfolios Every Year
For money funding actual withdrawals, refresh the Sortino calculation each financial year against your current spending requirement. A portfolio that comfortably cleared a four per cent floor for a decade can start breaching it as spending needs rise or markets flatten, and the ratio will flag the deterioration years before the balance itself looks troubled. Early warning is the entire value of measuring downside risk on a schedule.
Real-World Examples
Margaret Finds Her Income Fund Is Doing Its Job
Margaret worried her covered-call income fund was underperforming her nephew's growth ETF by four points a year. Computing Sortino against her five per cent income need told the real story: the income fund's ratio was nearly double the growth fund's, because it had never missed her floor while the ETF had breached it twice in six years. She stopped benchmarking her retirement money against accumulation portfolios and rebalanced her attention accordingly.
Jack Learns His Star Fund Had One Terrible Year
Jack's concentrated small-cap fund averaged nineteen per cent across five years and he assumed the risk was worth it. Sortino told a sharper tale: nearly all the downside deviation came from a single sixty per cent drawdown year, which the strong average had buried. He trimmed the position to satellite size and paired it with a steadier core, cutting his portfolio's downside deviation by more than half while keeping most of the expected return.
The Chen Family Stress-Tests Their Bridge Plan
Living off their portfolio for five years before pension eligibility, the Chens needed certainty more than upside. Setting the Sortino target at their actual four-and-a-half per cent withdrawal rate revealed that their balanced fund had fallen short in two of the last ten years, exactly the outcome their plan could least afford. They shifted two years of withdrawals into term deposits, leaving the growth engine to work above the floor, and their portfolio's downside deviation against the real hurdle dropped to zero.
Glossary of Terms
- Minimum Acceptable Return (MAR)
- The target return below which outcomes count as losses in the Sortino calculation. Set it to the cash rate for growth money or your actual withdrawal rate for income portfolios.
- Downside Deviation
- The standard deviation computed only from returns below the target, ignoring upside years entirely. It is the Sortino ratio's denominator and its key difference from the Sharpe ratio.
- Target Return
- The return threshold your portfolio genuinely needs to deliver for its purpose, whether that is beating cash or funding withdrawals. Sortino measures excess return per unit of shortfall below it.
Frequently Asked Questions
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Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.