Sharpe Ratio vs Sortino Ratio
Compare Risk Metrics and Choose the Right One for Your Strategy
Risk-adjusted returns matter — but not all risk is equal. The Sharpe Ratio and Sortino Ratio are two of the most common metrics traders use to evaluate performance. Both measure return relative to risk, but they answer very different questions.
This guide breaks down how each ratio works, when one is misleading, and which metric fits different trading strategies.
Quick Answer: Which Should You Use?
Use Sharpe Ratio if:
- •You want a simple, standardized risk metric
- •Your strategy has symmetric volatility
- •You're comparing diversified portfolios
Use Sortino Ratio if:
- •You only care about downside risk
- •Your returns are skewed or asymmetric
- •You want a clearer picture of drawdown risk
If avoiding losses matters more than total volatility, Sortino is usually the better lens.
What Is the Sharpe Ratio?
The Sharpe Ratio measures how much return you earn per unit of total volatility. Conceptually: "How much excess return am I getting for the risk I'm taking?"
It treats all volatility the same — upside and downside are both considered risk.
Why Traders Use It
- •Simple and widely accepted
- •Easy to compare across assets
- •Common in portfolio analysis
Where It Falls Short
- •Penalizes upside volatility
- •Can misrepresent strategies with uneven returns
- •Doesn't distinguish good vs bad risk
What Is the Sortino Ratio?
The Sortino Ratio refines Sharpe by focusing only on downside volatility. Conceptually: "How much return am I earning for the downside risk I'm exposed to?"
Positive volatility is ignored — only returns below a target threshold are considered risky.
Why Traders Prefer It
- •Aligns better with how traders actually experience risk
- •More accurate for skewed or asymmetric strategies
- •Highlights drawdown sensitivity
Tradeoffs
- •Requires defining a downside threshold
- •Slightly more complex to calculate
- •Less commonly reported than Sharpe
Sharpe vs Sortino — Side-by-Side
| Feature | Sharpe Ratio | Sortino Ratio |
|---|---|---|
| Risk measured | Total volatility | Downside volatility only |
| Penalizes upside | Yes | No |
| Best for | Balanced portfolios | Skewed trading strategies |
| Complexity | Low | Moderate |
| Drawdown sensitivity | Weak | Strong |
Common Trading Scenarios
Systematic Portfolio or ETF Strategy
Sharpe Ratio works well when volatility is relatively balanced and symmetric.
Options Selling or Trend Following
Sortino often tells the truth that Sharpe hides — especially when returns are lumpy.
Comparing Two Strategies With Similar Returns
Sortino highlights which one exposes you to real downside risk, not just movement.
Calculate Each Metric
Compare the same return series under both lenses — the difference is often revealing.
Related comparisons
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Per-trade risk control vs long-run blow-up probability.
Why price moves vs what you make/lose at expiration.
Market expectations vs past price movement — when to use implied volatility or historical volatility for trading decisions.
Options Probability estimates a trade's chance of profit; Risk of Ruin estimates long-run blow-up risk. Use the right one for the decision.
Understand the difference between expected move and implied volatility, and how each influences options pricing and trade planning.
Learn when to use Kelly Criterion vs Risk of Ruin, how bet sizing affects survival risk, and which metric matters for your trading system.
Learn how implied volatility and Black-Scholes differ, how IV feeds theoretical pricing, and when each matters for options decisions.
Income from selling calls vs downside insurance from buying puts — choose the right single-leg options overlay.
Wide profit zone with lower credit vs narrow zone with higher credit — pick the right neutral strategy.
ATM volatility play with tighter breakevens vs OTM play with lower cost — compare both directional-agnostic strategies.
Risk/reward evaluates a single trade setup. Kelly Criterion sizes your bet based on your edge. Learn when to use each for better trading decisions.
Drawdown measures how much you've lost from peak. Risk of Ruin estimates the probability of total account loss. Use both for complete risk management.
Options P/L shows your exact profit at expiration. Expected Move shows the probable price range. Use both to plan options trades with context.
Position Size calculates shares for stock trades. Lot Size calculates units for forex trades. Same concept, different markets and conventions.
Related Strategy Guides
Bottom Line
- •Sharpe Ratio measures efficiency across all volatility
- •Sortino Ratio measures efficiency against downside risk
If you care about avoiding losses more than smoothing returns, Sortino usually tells the better story. Use both — but understand what each one is really saying.
Frequently Asked Questions
Is a higher Sharpe Ratio always better?
Not necessarily. A high Sharpe can still hide large downside moves if returns are skewed.
Can Sortino be negative?
Yes — if downside volatility dominates returns, the ratio will reflect that.
Which metric do professional traders use?
Both. Sharpe is standard for reporting; Sortino is often preferred for internal risk analysis.
Should I ignore Sharpe entirely?
No. Use Sharpe for comparability, Sortino for decision-making.