Risk-Adjusted Returns in DeFi: Sharpe, Sortino, and Calmar for 24/7 Markets

Traditional risk metrics work differently in DeFi. Here is what institutional allocators need to know about computing Sharpe, Sortino, and Calmar ratios for a portfolio that never closes.

The 365-Day Convention

Every risk metric in DeFi requires a decision about annualization. Traditional finance uses 252 trading days because equity markets are closed on weekends and holidays. DeFi protocols run every hour of every day, including weekends and bank holidays.

Using 252 understates annualized volatility and overstates annualized returns for DeFi portfolios by a factor of √(365/252) ≈ 1.20. A DeFi fund reporting Sharpe ratios annualized with 252 days is systematically overstating its risk-adjusted performance by approximately 20% relative to a TradFi fund computed on the same basis.

The correct DeFi convention is 365 calendar days. All risk metrics should be computed and reported on this basis to be comparable across strategies.

Sharpe Ratio

The Sharpe ratio measures excess return per unit of total volatility:

Sharpe = (Mean daily return − Risk-free rate) / σ_daily × √365

For DeFi funds, the risk-free rate is typically set to the on-chain stablecoin lending rate — the return the fund could have earned by simply lending USDC to Aave or Morpho Blue. This is a more appropriate benchmark than the US Treasury rate, which is not directly accessible to a DeFi fund.

A Sharpe ratio above 1.0 in DeFi is strong. Above 2.0 should be scrutinized carefully — high Sharpe ratios in DeFi are often a sign of a strategy with embedded tail risk (e.g., delta-neutral strategies with significant liquidation risk in extreme scenarios).

Sortino Ratio

The Sortino ratio modifies the Sharpe ratio to penalize only downside volatility:

Sortino = (Mean daily return − Risk-free rate) / σ_downside × √365

where σ_downside uses only daily returns below the target return (typically 0 or the risk-free rate).

For DeFi yield strategies, the Sortino ratio is often a more representative metric than Sharpe. A USDC lending strategy has very low downside volatility — the position value only falls in rare protocol failure scenarios — but may have moderate upside volatility from yield rate fluctuations. Sharpe would penalize the upside volatility unfairly; Sortino ignores it.

Calmar Ratio

The Calmar ratio measures return relative to maximum drawdown:

Calmar = Annualized Return / |Max Drawdown|

For DeFi funds, the Calmar ratio captures something Sharpe and Sortino miss: the depth of the worst historical loss. A fund with excellent Sharpe and Sortino but a 60% max drawdown would show a low Calmar — correctly signaling that the tail risk was severe.

Max drawdown in DeFi needs to be computed on daily NAV, not on a subset of reporting dates. A fund that suffered a 40% intra-month drawdown but recovered before month-end would not show that drawdown in monthly data — only daily NAV tracking captures it correctly.

Rolling Metrics and Regime Detection

Point-in-time risk metrics are less useful than rolling windows for understanding how a strategy’s risk profile evolves. A rolling 90-day Sharpe ratio plotted over the fund’s history shows whether the strategy consistently delivered risk-adjusted returns or whether the full-history Sharpe was driven by a single exceptional period.

For allocators evaluating a DeFi fund, the rolling Sharpe and Sortino are as important as the since-inception figures — they reveal whether the risk profile is stable or whether the manager’s edge is regime-dependent.