Why Raw Returns Aren't Enough
An investor who earned 20% last year sounds impressive. But how much risk did they take to get there? Did they concentrate everything in one volatile stock? Did they experience a 40% drawdown before recovering? Would their strategy survive a bear market?
Raw returns answer only one question. Risk metrics answer the ones that matter.
Three numbers will tell you almost everything you need to know about whether an investing strategy is working: Sharpe ratio, max drawdown, and win rate. Here's what each means and how to use them.
Sharpe Ratio: Return Per Unit of Risk
What it measures: How much return you earn for every unit of volatility (risk) you accept.
The formula: (Portfolio Return – Risk-Free Rate) ÷ Portfolio Standard Deviation
In plain English: if your portfolio returns 12% with high volatility, and another portfolio returns 10% with low volatility, the second might be the better investment — because you're getting roughly the same result for less stress and less downside exposure.
What good looks like:
| Sharpe Ratio | Interpretation |
|---|---|
| Below 0 | Strategy is losing money or underperforming cash |
| 0 – 0.5 | Poor. Insufficient return for the risk |
| 0.5 – 1.0 | Acceptable but improvable |
| 1.0 – 2.0 | Good. This is where consistent strategies land |
| Above 2.0 | Excellent. Hedge funds often target this range |
The Sharpe ratio is particularly useful for comparing two strategies. If Strategy A has a Sharpe of 0.8 and Strategy B has a Sharpe of 1.4, Strategy B is delivering better risk-adjusted returns — even if Strategy A has higher absolute returns.
WealthSignal's performance dashboard calculates your Sharpe ratio automatically so you can track it over time without doing the math yourself.
Max Drawdown: Your Worst-Case Scenario
What it measures: The largest peak-to-trough decline your portfolio experienced during a given period.
Example: If your portfolio reached $15,000 and then fell to $9,000 before recovering, your max drawdown is 40%.
Max drawdown matters because of a mathematical asymmetry: losses require proportionally larger gains to recover from.
| Drawdown | Recovery Required |
|---|---|
| 10% | 11.1% |
| 20% | 25.0% |
| 30% | 42.9% |
| 50% | 100.0% |
| 75% | 300.0% |
What good looks like: A max drawdown under 15-20% is generally considered healthy for a balanced portfolio. Aggressive growth strategies might accept 25-30%. Anything above 40% requires exceptional returns to justify the risk.
How to improve it: Diversification and position sizing are your primary tools. Never let a single position represent more than 5-10% of your portfolio. Review your concentration regularly.
Win Rate: Understanding Your Hit Percentage
What it measures: The percentage of your trades that are profitable.
The formula: Number of winning trades ÷ Total number of trades × 100
Beginners often focus on win rate as the primary performance indicator. This is a mistake. Win rate is almost meaningless without knowing the average size of wins versus losses.
The key relationship:
A 40% win rate can be highly profitable if winners average 3x the size of losers. A 70% win rate can be unprofitable if every win is small and every loss is large.
The profit factor = Total profits from winners ÷ Total losses from losers
A profit factor above 1.5 generally indicates a healthy strategy.
Example:
- 100 trades, 40 winners, 60 losers
- Average winner: $300
- Average loser: $100
- Win rate: 40%
- Profit factor: (40 × $300) ÷ (60 × $100) = $12,000 ÷ $6,000 = 2.0 ✓
This strategy makes money despite a sub-50% win rate.
Using These Metrics Together
No single metric tells the full story. The three work together:
A healthy strategy looks like:
- Sharpe ratio: 1.0 or above
- Max drawdown: under 20%
- Win rate with positive profit factor
Warning signs:
- High returns + high max drawdown = lucky, not good
- High win rate + negative profit factor = cutting winners short, letting losers run
- Low Sharpe + decent returns = taking too much risk for the result
How to Check Your Numbers
If you're paper trading on WealthSignal, these metrics update automatically as you trade. Check them monthly. The goal isn't to hit a target number in month one — it's to see them improve over time as your strategy and discipline develop.
Before going live with real money, aim for at least 60 days of consistent data showing a Sharpe above 0.8 and a max drawdown below 25%. That won't guarantee future performance, but it gives you a reasonable evidence base for your approach.
Understanding these metrics is what separates investing from gambling. Start tracking yours today.