What is the Sortino Ratio?
Sharpe Ratio penalizes any volatility, upside or downside, equally. Sortino only penalizes downside volatility - the swings that actually cost an investor money - so a fund that’s volatile mostly because it occasionally jumps up scores better on Sortino than on Sharpe.
Sortino = (Rp − Rf) / σd
Higher is better, and Sortino is always ≥ Sharpe for the same fund since it only counts the “bad” volatility.
Real comparison across 6 funds
CHART
3Y Sortino Ratio - 6 real funds
Same funds as the Sharpe Ratio comparison - notice the ranking can shift once only downside volatility counts.
Funds compared: Parag Parikh Flexi Cap · DSP Value · ICICI Prudential Value · SBI Focused · Parag Parikh ELSS Tax Saver · SBI Multicap
Reading the spread
Across these 6 funds, 3-year Sortino Ratio runs from 0.58 (Parag Parikh ELSS Tax Saver) to 1.57 (DSP Value), a gap of 1.00. The middle value is 1.08, with 3 of 6 above it. The highest reading is 2.7 times the lowest, so the choice of fund changes this number a lot. Taking higher as better, DSP Value leads and Parag Parikh ELSS Tax Saver trails on this measure alone.
How to use it in practice
Choose Sortino over Sharpe when you care more about losses than about swings in general. Sharpe treats a sharp rise and a sharp fall as equally risky, but investors rarely mind the first. Sortino counts only the downside, so a fund whose volatility comes mostly from rising prices scores better on Sortino than on Sharpe. It is especially useful for debt and hybrid funds, where upside volatility is small and drops are what hurt.
Common mistakes
Do not treat a higher Sortino as a guarantee of low losses; it describes the past window only. Compare it only between funds with the same category and period, since the minimum acceptable return used in the calculation matters. And remember it still averages over time: a fund can have a good Sortino and one very bad month.
Frequently asked questions
How is the Sortino Ratio different from the Sharpe Ratio?
Both divide excess return by a measure of risk. Sharpe uses total standard deviation, Sortino uses only downside deviation, meaning the volatility of returns that fell below a minimum acceptable level. That makes Sortino kinder to funds whose swings are mostly upward.
What is a good Sortino Ratio?
Higher is better, and as with Sharpe the useful comparison is against the median of the same category over the same window. Because downside deviation is smaller than total deviation, Sortino values are usually larger than Sharpe values for the same fund.
Why does Sortino matter for debt funds?
Debt funds normally have small upside moves, so the risks that matter are the occasional losses from rate rises or credit events. Sortino isolates exactly those, which is why it is a more telling measure than Sharpe for debt and hybrid funds.
WHAT THIS MEANS FOR YOU If a fund’s Sortino Ratio is much higher than its Sharpe Ratio, its volatility skews upward - a genuinely different risk profile than a fund where the two ratios are close together.
METHODOLOGY Computed over a trailing 3-year window as of 2026-08-31. Downside deviation uses only return periods below zero. Data: Punji risk analytics. Not investment advice.