What is Sharpe Ratio?
The Sharpe ratio measures the risk-adjusted return of a trading portfolio or strategy by dividing its excess returns above the risk-free rate by the standard deviation of its returns. A Sharpe ratio above 1.5 indicates an institutional-grade strategy capable of consistent alpha without excessive drawdown volatility.
Mathematical Calculation
R_p is the expected strategy return, R_f is the benchmark risk-free rate, and sigma_p is the standard deviation of daily strategy returns. Multiplying by the square root of 252 annualizes daily trading performance.
Real-World Numerical Simulation
Sharpe Ratio Comparison Between Two Traders
Trader A: +40% annualized return with 20% return volatility. Sharpe = (0.40 - 0.05) ÷ 0.20 = 1.75.
Trader B: +60% annualized return with 45% return volatility. Sharpe = (0.60 - 0.05) ÷ 0.45 = 1.22.
Institutional Verdict: Trader A has superior risk-adjusted quality despite lower gross return, because Trader B exhibits wild equity swings that breach prop firm drawdown limits.
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Institutional Comparison Matrix
| Sharpe Value | Quality Assessment | Prop Firm Survivability |
|---|---|---|
| < 1.0 | Sub-optimal / Volatile | High risk of trailing or daily drawdown liquidation |
| 1.0 – 1.9 | Good / Retail Professional | Capable of passing 1-step and 2-step challenges |
| 2.0 – 2.9 | Very Good / Institutional | Consistent funded payouts across 5–20 accounts |
| > 3.0 | Elite / Quantitative | Top-tier risk-adjusted consistency on Leaderboards |
Monitored Prop Firms Applying This Rule
Frequently Asked Questions
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