What Is Sortino Ratio?
Sortino ratio measures how efficiently your trading strategy generates returns relative to the downside risk you take. Unlike other risk-adjusted metrics, it only penalizes downside volatility — the losses that actually hurt your account.
Think of it this way: if your strategy goes up 40% with wild swings, then down 5%, that downside volatility matters. But the upside volatility? That’s just noise. Sortino ratio captures this distinction.
The Formula
Sortino Ratio = (Average Return - Risk-Free Rate) / Downside Deviation
Where:
- Average Return = your mean trade return over the period
- Risk-Free Rate = typically 0% for forex traders (or 2-3% if you prefer to compare against treasury yields)
- Downside Deviation = the standard deviation of only negative returns
The higher the number, the better your risk-adjusted performance.
Sortino vs. Sharpe Ratio
The key difference is what counts as “risk.”
Sharpe ratio treats all volatility as risk. If your strategy makes +5% one day and -3% the next, Sharpe counts both swings equally.
Sortino ratio ignores the +5% day and only looks at the -3% day. Profitable volatility isn’t risk — it’s profit.
For forex traders, this distinction matters. Your strategy’s volatility likely includes both profitable and unprofitable moves. Sortino tells you the true cost of your losses.
Practical Example
Imagine two strategies over 20 trades:
Strategy A:
- Total return: +15%
- Average monthly volatility: ±8% (includes both winning and losing swings)
- Maximum downside volatility: -12%
- Sortino ratio: 1.8
Strategy B:
- Total return: +15%
- Average monthly volatility: ±3% (tighter, more consistent)
- Maximum downside volatility: -4%
- Sortino ratio: 2.6
Both made the same profit. Strategy B earned it with far less painful drawdowns. Its higher Sortino ratio reflects that.
How to Use Sortino in Your Journal
Track your Sortino ratio quarterly to spot patterns:
- Compare strategies — which one delivers profits with less pain?
- Identify improvements — if your Sortino drops, look for trades that broke your rules
- Risk management — a declining Sortino ratio often signals position sizing creeping up
- Validate entries — strategies with Sortino above 2.0 typically have consistent entry logic
In PipJournal, you can filter trades by strategy or timeframe and calculate Sortino automatically. This lets you see which market conditions or entry setups produce the best risk-adjusted returns.
The Takeaway
Sortino ratio answers the question: “Am I making money efficiently, or am I just grinding through unnecessary losses?” A trader with a 1.5 Sortino ratio making +15% might be far more skilled than one with a 0.8 Sortino making +25% — because the first is doing it with discipline.
Use it to evaluate not just whether your strategy works, but whether it works efficiently.
