Does your portfolio return well relative to the risk you take? The Sortino ratio measures the return adjusted for downside risk: unlike the Sharpe ratio, which penalizes all volatility, the Sortino considers only the negative swings, the ones that really worry investors. This calculator determines it, together with the excess return, the Sharpe ratio for comparison and the share of downside volatility. It is the essential tool for those evaluating an investment's performance while accounting for real risk.

What the Sortino ratio is

The Sortino ratio measures how much excess return a portfolio generates per unit of downside risk. It is calculated by dividing the excess return (return minus the minimum acceptable rate) by the downside deviation, that is, the variability of the negative returns only. A Sortino of 1.13 means 1.13 points of excess return for every point of downside risk. The higher it is, the better the return relative to the risk of losses: it is the preferred measure for those who judge an investment not on volatility in general, but on the risk of falling.

Why look only at the downside

The total volatility, used by the Sharpe ratio, penalizes both the upward and the downward swings. But an investor does not fear sudden rises: they fear losses. The Sortino ratio corrects this asymmetry by measuring only the variability of the returns below a threshold (the minimum acceptable rate). Two portfolios with the same total volatility can have very different downside risks: one with mostly positive swings is preferable, and the Sortino rewards it while the Sharpe would treat them equally.

How the Sortino is calculated

The formula is: Sortino = (return − minimum rate) / downside deviation. The return is that of the portfolio in the period; the minimum acceptable rate (or risk-free) is the threshold below which a return is considered "bad"; the downside deviation is the standard deviation calculated only on the returns below that threshold. With a return of 12%, a minimum rate of 3% and a downside deviation of 8%: Sortino = (12 − 3) / 8 = 1.13. The calculator asks for these values and returns the ratio together with the comparison indicators.

The excess return

The excess return is the first result: portfolio return minus the minimum acceptable rate. It is the numerator common to Sortino and Sharpe, and it represents the "premium" the portfolio generated above the minimum threshold. With a return of 12% and a minimum of 3%, the excess is 9%. If the return is below the minimum, the excess is negative and the Sortino becomes negative: the investment did not even reward the minimum accepted risk. It is the basis on which efficiency relative to risk is measured.

The downside deviation

The downside deviation is the heart of the Sortino: it measures how much the negative returns (below the minimum rate) swing, ignoring the positive ones. It is always less than or equal to the total standard deviation, because it considers only part of the swings. The lower it is, the "calmer" the portfolio in the negative phases. Calculating it requires the historical series of returns; in this calculator you enter it directly as an input, together with the total deviation, to obtain Sortino and Sharpe and compare them.

Sortino vs Sharpe

The Sharpe ratio is the better-known "cousin" of the Sortino: same excess return, but divided by the total standard deviation instead of the downside only. The calculator shows both. Since the downside deviation is less than the total, the Sortino is almost always greater than the Sharpe. The difference between the two tells how much the volatility is concentrated on the downside: a small difference indicates symmetric swings; a large one indicates that much of the volatility is "good" (upward), rewarding the portfolio in the Sortino.

The share of downside volatility

The share of downside volatility is the ratio between the downside deviation and the total deviation, as a percentage. It indicates how much of the total volatility is due to the negative movements. With a downside of 8% and total of 15%, the share is 53%: about half the volatility is on the downside. A low value is positive: the volatility is mostly upward, therefore less "dangerous". It is a useful indicator to understand the nature of a portfolio's risk, beyond its magnitude.

How the calculator works

Enter the portfolio return, the minimum acceptable rate, the total standard deviation and the downside deviation. The calculator determines the excess return, the Sortino ratio, the Sharpe ratio, their difference and the share of downside volatility. The verdict tells you whether the return adjusted for downside risk is negative, modest, good or excellent. It is the quickest way to judge an investment on the risk that really matters: that of losing.

The values you need

The return is that of the portfolio in the period (annual for a standard comparison). The minimum acceptable rate is the chosen threshold: often the risk-free rate, or the investor's minimum objective. The total deviation and the downside deviation are derived from the series of returns (monthly, annualized). If you do not have them, many analysis software calculate them. Use consistent values in the period and the annualization for ratios comparable with the benchmarks.

Interpreting the Sortino ratio

How to read the Sortino ratio:

The references are indicative: they should be compared with the investment category and with consistent benchmarks.

Sortino and Sharpe compared

What the two indicators measure and how they differ:

The Sortino is fairer for strategies with asymmetric returns, where the rises should not be penalized like the losses.

Example: same return, different downside

With a return of 12% and a minimum rate of 3% (excess 9%), the Sortino depends on the downside deviation:

At the same return, the lower the downside risk, the higher the Sortino: stability in the negative phases is rewarded.

When to use the Sortino

The Sortino is particularly useful for strategies with asymmetric returns: hedge funds, options, strategies with downside protection, where the rises are frequent and the losses limited. In these cases the Sharpe underestimates the quality of the portfolio, penalizing the "good" volatility. It is also useful for investors with a clear minimum threshold of return (pension objectives, target rates). For portfolios with symmetric returns, Sharpe and Sortino give similar indications.

What the calculation does not consider

The calculator uses the total deviation and downside deviation as inputs: it does not calculate them from the series of returns, which requires historical data and a choice of frequency (monthly, annual). It assumes the values are consistent and annualized in the same way. It does not consider the costs, the taxes nor the tail risk (extreme events that neither Sharpe nor Sortino capture well). Like all historical indicators, it measures the past and does not guarantee future results. It is an informational estimate, not investment advice.

Common mistakes

• Comparing Sortinos calculated with different minimum rates (the denominator changes).
• Using a downside deviation greater than the total (it is impossible: the downside is a subset).
• Comparing ratios with different frequencies or annualizations.
• Judging an investment only on the Sortino, ignoring absolute return and tail risk.
• Forgetting that historical indicators do not predict the future.

How to use the calculator

Enter the return, the minimum rate, the total deviation and the downside deviation. Read the excess return, the Sortino, the Sharpe, the difference and the downside share. Compare the Sortino with the category benchmarks. Try varying the downside deviation to see how much stability in the negative phases improves the ratio. It is the quickest way to assess the downside-risk-adjusted performance and compare investments more fairly than the Sharpe.

Practical example

Your portfolio returned 12% in the year, with a minimum acceptable rate of 3%, a total standard deviation of 15% and a downside deviation of 8%. The result: an excess return of 9%, a Sortino ratio of 1.13, a Sharpe ratio of 0.60, a difference of 0.53 and a share of downside volatility of 53%, with the verdict "good: solid return relative to downside risk". The Sortino (1.13) is almost double the Sharpe (0.60): much of the volatility is upward, so the portfolio is better than the Sharpe suggests. Enter your numbers for your real situation. The calculation uses deviations provided as inputs and does not consider costs, taxes or tail risk. It is an informational estimate, not investment advice.

Frequently asked questions

What is the Sortino ratio?

It is a measure of the return adjusted for downside risk: excess return divided by the downside deviation (variability of the negative returns only). Unlike the Sharpe, it considers only the downward swings, the ones that worry investors.

How is the Sortino ratio calculated?

Sortino = (return − minimum acceptable rate) / downside deviation. With a return of 12%, minimum of 3% and downside deviation of 8%: (12−3)/8 = 1.13. The higher it is, the better the return relative to the risk of losses.

What is the difference between Sortino and Sharpe?

Both use the same excess return in the numerator, but the Sharpe divides by the total volatility, the Sortino by the downside deviation only. Since the downside is less than the total, the Sortino is almost always greater than the Sharpe.

What is the downside deviation?

It is the standard deviation calculated only on the returns below the minimum acceptable rate, that is, the "bad" swings. It measures the downside risk ignoring the positive volatility. It is always less than or equal to the total standard deviation.

What is a good Sortino ratio?

In general: below 1 modest, between 1 and 2 good, over 2 excellent. A negative value means the return is below the minimum acceptable. The references should be compared with the investment category and consistent benchmarks.

Why is the Sortino often higher than the Sharpe?

Because in the denominator it uses the downside deviation, which is less than the total volatility (it excludes the positive swings). Dividing the same excess by a smaller number gives a higher ratio. The difference indicates how much the volatility is "good".

What is the minimum acceptable rate (MAR)?

It is the return threshold below which a result is considered "bad": often the risk-free rate, or the investor's minimum objective. It determines which returns enter the downside deviation calculation and the excess return.

When is it better to use the Sortino instead of the Sharpe?

For strategies with asymmetric returns (hedge funds, options, downside protection), where the frequent rises should not be penalized like the losses. Also for investors with a clear minimum return threshold to respect.

Can the downside deviation exceed the total deviation?

No, it is impossible: the negative returns are a subset of all the returns, so their variability is always less than or equal to the total. If you enter a downside greater than the total, the data is inconsistent.

Does the Sortino predict future returns?

No, it is a historical indicator: it measures the past performance adjusted for downside risk. Like all ratios based on past data, it does not guarantee future results. It should be used to compare investments, not to predict.

Does the calculation consider costs and taxes?

No, it uses the returns and deviations you enter, gross of costs and taxes. For a realistic comparison, use consistent net returns. The calculation does not capture the tail risk either (rare extreme events).

Does it work for any country and currency?

Yes, the Sortino ratio is a pure number, independent of the currency. The calculation is universal: it uses return, minimum rate and deviations as percentages. It is a finance standard valid everywhere to assess risk-adjusted performance.

Updated July 2026