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The Sortino ratio refines the Sharpe ratio's idea by only counting downside volatility as "risk" — since most investors don't actually mind upside swings, only losses, Sortino arguably measures risk-adjusted return in a way that better matches real investor concerns.
How it works
Enter the portfolio's return, the risk-free rate, and its downside deviation (volatility of negative returns only), and the calculator applies Sortino Ratio = (Portfolio Return − Risk-Free Rate) ÷ Downside Deviation.
- Enter portfolio return (%).
- Enter risk-free rate (%).
- Enter downside deviation (%).
- Click Calculate to see your results.
Examples
A stronger result than Sharpe for the same portfolio
A portfolio returning 12% with a 3% risk-free rate and an 8% downside deviation has a Sortino ratio of 1.125 — often higher than the same portfolio's Sharpe ratio, since downside deviation excludes upside volatility that Sharpe's standard deviation would otherwise penalize.
Who should use it
- Comparing risk-adjusted performance with a focus on downside risk specifically.
- Investment analysis and portfolio evaluation.
Industry applications
- Investment analysis and portfolio management
- Fund performance evaluation
Advantages
- Better matches how most real investors think about risk (losses, not gains).
- Doesn't penalize an investment for desirable upside volatility.
Limitations
- Downside deviation is less standardized and harder to compute consistently than plain standard deviation.
Common mistakes to avoid
- Using total standard deviation instead of true downside-only deviation, which would just reproduce the Sharpe ratio.
- Comparing Sortino ratios calculated with different target/threshold returns for "downside" — this changes the calculated downside deviation.
Best practices
- Use Sortino alongside Sharpe, not as a replacement — comparing the two shows how much of an investment's volatility is upside versus downside.
- Confirm the target threshold used to define "downside" is consistent when comparing Sortino ratios across investments.
Tips
- If Sortino is notably higher than Sharpe for the same investment, most of its volatility has been upside gains, not downside losses — generally a reassuring sign.