Enter your portfolio return, minimum acceptable return and downside deviation to calculate your Sortino Ratio instantly. Free, accurate, no signup required.
The total return your portfolio generated over the measurement period, expressed as an annual percentage. Use the same time horizon for all three inputs — mixing a monthly return with an annual downside deviation will produce a meaningless result.
The threshold return below which you consider performance a loss. This is the most important and most flexible input in the Sortino Ratio. Common choices:
0% — any negative return counts as downside risk
Risk-free rate — losses relative to what you could earn with no risk (e.g. current 3-month T-bill yield, approximately 4.3% as of early 2026)
Inflation rate — losses in real purchasing power terms
Benchmark return — losses relative to an index or peer group
There is no universally correct choice. Use the MAR that reflects your actual investment objective. If your goal is capital preservation, use 0%. If your goal is to beat inflation, use the inflation rate.
The standard deviation of returns that fall below your MAR — calculated only from the periods where the portfolio underperformed your threshold. Periods where return exceeded the MAR are excluded entirely.
This is what makes the Sortino Ratio different from the Sharpe Ratio. Standard deviation punishes both upside and downside volatility equally. Downside deviation measures only the volatility that actually hurts you.
Most brokerage platforms and fund factsheets publish downside deviation directly. If yours does not, it can be calculated from a return series by taking only the negative deviations from MAR, squaring them, averaging, and taking the square root.
The calculator outputs your Sortino Ratio using the formula:
Sortino Ratio = (Portfolio Return − MAR) / Downside Deviation
A portfolio manager reports the following over a 12-month period:
Annual portfolio return: 11.2%
Minimum acceptable return (risk-free rate): 4.3%
Downside deviation: 5.8%
Sortino Ratio = (11.2 − 4.3) / 5.8 = 1.19
This indicates good downside-adjusted performance. The portfolio generated 1.19 units of excess return above the risk-free rate for every unit of downside risk taken.
For comparison, if the same portfolio had a standard deviation of 9.4% (including upside volatility), its Sharpe Ratio would be 0.73 — significantly lower. The difference illustrates how strategies with positive skew — where most volatility is on the upside — look better on Sortino than on Sharpe. This is the correct assessment: upside volatility is not a problem.
| Sortino Ratio | What it means |
|---|---|
| Below 0 | Portfolio return is below your MAR — performance is unacceptable relative to your threshold |
| 0 – 1 | Positive excess return but weak downside-adjusted performance |
| 1 – 2 | Good — the portfolio is generating solid return per unit of downside risk |
| Above 2 | Excellent downside-adjusted performance |
These thresholds are guidelines, not rules. A Sortino Ratio of 0.8 in a high-volatility market environment may represent genuinely strong risk management. A Sortino Ratio of 2.5 from a very short data period may be statistically unreliable. Always interpret in context.
One critical point: the Sortino Ratio is only comparable across portfolios using the same MAR. Comparing a manager using MAR = 0% against one using MAR = 4% is not meaningful — the denominator is measuring different things.
Three: your portfolio’s return for the period, the minimum acceptable return (MAR) you’ve set as your threshold, and the downside deviation — the standard deviation of only those returns that fell below your MAR.
Use whatever threshold reflects your actual investment objective. Capital preservation investors typically use 0%. Investors trying to beat inflation use the inflation rate. Investors benchmarking against T-bills use the risk-free rate. The MAR is not a mathematical input — it is a statement of what you consider failure.
Standard deviation measures the spread of all returns — both above and below the mean. Downside deviation measures only the spread of returns that fall below your MAR. Returns above the MAR are completely ignored. This means strategies that generate frequent large gains alongside occasional moderate losses score better on Sortino than on Sharpe, which is the correct risk assessment for most investors.
Yes. A negative result means your portfolio return was below the MAR — you did not achieve your minimum acceptable threshold. The Sortino Ratio can also be negative when the portfolio return is positive but below the MAR (for example, return of 2% against MAR of 4% produces a negative ratio regardless of downside deviation).
This typically means your portfolio has positive skew — most of its volatility is on the upside. The Sharpe Ratio penalises you for those upside gains by including them in the standard deviation denominator. The Sortino Ratio ignores them, producing a higher reading. This is not a distortion — it accurately reflects that upside volatility is not a risk from the investor’s perspective.
The Sortino Ratio requires a sufficient number of sub-MAR periods to produce a statistically stable downside deviation estimate. With fewer than 36 monthly observations (3 years), the result is highly sensitive to individual bad months. With 60+ monthly observations (5 years), the estimate becomes more reliable. Short-period Sortino Ratios — particularly from strategies that rarely lose money — should be treated with caution.
The Sortino Ratio has significant conceptual depth — including its foundations in expected utility theory, the statistical properties of downside deviation, the consequences of MAR selection, and the professional debate about when it outperforms and when it misleads.
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