The Sortino Ratio is a refinement of the Sharpe Ratio that measures risk-adjusted return using only downside deviation — the volatility of negative returns below a minimum acceptable return (MAR) — rather than total standard deviation. This makes it a more intuitive risk measure for investors who are concerned specifically about losses rather than upside volatility. It is calculated as: Sortino Ratio = (Portfolio Return – MAR) ÷ Downside Deviation. A fund with a high Sortino Ratio generates strong returns relative to its downside risk — a more meaningful distinction than the Sharpe Ratio for equity funds that exhibit asymmetric return distributions. In Indian mutual fund analysis, the Sortino Ratio is particularly useful for comparing equity funds during volatile market periods such as the COVID-19 crash or the 2022 global rate hike cycle, where a fund's ability to limit drawdowns (rather than reduce all volatility) was the primary differentiator of long-term wealth creation.
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