Serenity Ratio Calculator

How to Use the Serenity Ratio Calculator

The Serenity Ratio is a drawdown-adjusted performance metric. It answers: "How much excess return do I get for each unit of average drawdown?" Our calculator uses portfolio return, risk-free rate, and average drawdown.

1. Enter Portfolio Return: Your portfolio's average or annualized return in percent (e.g. 12 for 12%).
2. Enter Risk-Free Rate: The return of a risk-free asset (e.g. T-bills or 10-year Treasury, such as 4%).
3. Enter Average Drawdown: The typical decline from peak to trough as a positive percentage (e.g. 8 for 8%).
4. Read Results: Excess return = Portfolio − Risk-free. Serenity Ratio = Excess Return ÷ Average Drawdown.

What is the Serenity Ratio?

The Serenity Ratio measures risk-adjusted return by penalizing strategies that suffer large or frequent drawdowns. It is a drawdown-adjusted return metric: you get more "credit" for the same return if your average drawdown is lower.

Serenity Ratio = (Portfolio Return − Risk-Free Rate) / Average Drawdown

Excess return is return above the risk-free rate. Average drawdown is the typical decline from a peak—either the mean of historical drawdowns or an estimate. By dividing excess return by average drawdown, the ratio rewards stable, low-drawdown performance.

• Higher Serenity Ratio: More excess return per unit of drawdown; smoother, more sustainable performance.
• Lower or negative: Either low excess return or high drawdowns (or both); less attractive on a drawdown-adjusted basis.

Why Drawdown-Adjusted Return Matters

Volatility-based metrics (e.g. Sharpe) treat all variance alike. Drawdown-based metrics focus on losses from peaks—what investors actually feel. The Serenity Ratio combines excess return with average drawdown to highlight strategies that grow with fewer painful pullbacks.

• Stability: Strategies with similar returns but smaller average drawdowns score higher.
• Comparison: Compare funds or strategies on drawdown-adjusted return alongside Calmar (max drawdown) and Sharpe (volatility).
• Risk awareness: Encourages focus on downside risk, not just headline return.

Serenity Ratio vs. Calmar Ratio

Both are drawdown-adjusted. The Calmar Ratio uses maximum drawdown (worst peak-to-trough). The Serenity Ratio uses average drawdown (typical decline). Calmar is more sensitive to one bad period; Serenity reflects typical stress. Use both when evaluating strategies.

Frequently Asked Questions