Side-by-side metric guide

Sharpe Ratio vs Sortino Ratio

Sharpe measures return per unit of total volatility, while Sortino only penalizes downside volatility. Use both together to see whether volatility is mostly harmful or mostly upside noise.

When to use each

Sharpe

Use Sharpe when you want a broad, standard benchmark for risk-adjusted return that is comparable across portfolios and funds.

Sortino

Use Sortino when your strategy has asymmetric returns and you care more about downside protection than total variance.

Key differences

Risk denominator

Total standard deviation of returns

Downside deviation only

Penalty

Penalizes upside and downside volatility

Penalizes downside volatility only

Best for

General benchmarking and comparability

Loss-sensitive analysis and asymmetric strategies

Common pitfalls

  • Comparing readings from different time windows can mislead interpretation.
  • A higher Sortino alone does not prove low risk if max drawdown is still severe.
  • Very short histories make both ratios unstable.

Practical decision rule

If Sharpe is mediocre but Sortino is strong, your volatility may be mostly upside. If both are weak, the return quality is likely poor.

Frequently asked questions

Can Sortino be lower than Sharpe?
In normal definitions, Sortino is typically equal to or higher than Sharpe because it excludes upside volatility from the risk denominator.
Which one should I optimize for?
Use Sharpe for broad comparability, then use Sortino to check downside quality. Optimizing only one can hide risk structure.

See these metrics on your own portfolio.

Portivex calculates both metrics side by side so you can make decisions with clearer risk context.

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