Options Returns Explained: A Comprehensive Guide to Calculating Risk-Adjusted Returns

TL;DR: Option returns should not be judged on absolute figures alone; you must pair them with risk-adjusted metrics (e.g., the Sharpe ratio, return on capital) to assess performance objectively. This article breaks down the core calculations behind option returns to help you build a more comprehensive analytical framework.

Options trading attracts many investors because of its flexibility and relatively low capital required to enter. However, when calculating option returns, many focus only on how much they made while overlooking the key question of how much risk they took. This article introduces the core logic for computing option returns, covering tools such as annualized return, return on capital, and the Sharpe ratio.

Basic calculations for option returns

Option premium and rate of return

An option is a contract that gives the holder the right, but not the obligation, to buy or sell an asset at an agreed price. When purchasing an option, the investor pays the option premium, which also represents the buyer’s maximum loss.

Basic calculation of option returns:

• Option return (absolute) = Option value at expiration − Initial premium paid
• Option return (%) = Option return ÷ Initial premium paid × 100%

A hypothetical example: If you buy a call option for HKD 500 and its value at expiration is HKD 800, the return is 60%; if it expires worthless, you lose the entire premium and the return is -100%. These are hypothetical examples; actual results may vary.

Annualized return: A common basis for comparison

Holding periods differ across contracts, so directly comparing returns can be misleading. Annualized return provides a standardized basis for comparison:

Annualized return = Return × (365 ÷ Holding days)

If a trade generates an 8% return over 30 days, the annualized return is roughly 97%. Note this is a hypothetical extrapolation and not a sustainable, realizable return.

Return on capital: A core tool for evaluating credit spreads

How to calculate return on capital

For short option or credit spread (Credit Spread) strategies, return on capital (ROC) is a more practical metric. It measures the premium collected relative to the maximum potential loss.

ROC = Net premium collected ÷ Maximum possible loss × 100%

A hypothetical bull put spread (Bull Put Spread) example:

• Net premium collected: USD 1.50 (per share)
• Spread width: USD 5.00 (per share), so maximum loss is USD 3.50
• ROC: USD 1.50 ÷ USD 3.50 ≈ 42.9%

ROC allows investors to compare strategies objectively. Note that a higher ROC generally signals higher risk. If a strategy’s ROC is unusually high, it may indicate elevated implied volatility or significant uncertainty around the underlying (for example, ahead of earnings). When evaluating a strategy, also consider the breakeven point, probability of profit, and maximum potential loss.

Risk-adjusted return metrics

Sharpe ratio

The Sharpe ratio, introduced by William F. Sharpe in 1966, is a standard tool for measuring risk-adjusted returns.

Sharpe ratio = (Investment return − Risk-free rate) ÷ Standard deviation of returns

For example, if a strategy’s annualized return is 12%, the risk-free rate is 4%, and the standard deviation is 10%, the Sharpe ratio is 0.8. Generally, a Sharpe ratio of 1.0 or higher is considered solid, while 2.0 or above reflects strong risk-adjusted efficiency.

Sortino ratio and maximum drawdown

A limitation of the Sharpe ratio is that it treats all volatility the same. The Sortino ratio considers only downside deviation and does not penalize upside volatility, making it more suitable for the asymmetric payoff profile of option-selling strategies.

Maximum drawdown measures the peak-to-trough decline: (Peak − Trough) ÷ Peak × 100%. Given the leverage inherent in options, understanding historical maximum drawdown helps in setting appropriate position sizes and stop-loss levels.

Tip: It is advisable to use the Sharpe ratio, Sortino ratio, and maximum drawdown together to assess risk and return from multiple angles and avoid the blind spots of relying on a single metric.

Key drivers of option returns

The two-sided impact of implied volatility

Implied volatility (IV) is a key determinant of option premiums. Higher IV generally means more expensive options. For option buyers, purchasing when IV is elevated entails the risk of IV contraction: even if the underlying moves in the expected direction, the option’s price may shrink as IV falls.

Time-value decay (Theta)

An option’s premium consists of intrinsic value and time value. Time value erodes as expiration approaches—“Theta decay”—which is unfavorable for buyers and favorable for sellers. Understanding Theta helps in choosing trade timing and in accounting for time cost when computing option returns.

To understand the structural differences between options and futures, see A comparison of the roles and applications of options and futures.

A systematic framework for evaluating option returns

Pre-trade checklist

Before executing an options trade, consider the following:

1. Return on capital (ROC): Is the premium reasonable relative to the maximum loss?
2. Breakeven point: How far must the underlying move to break even?
3. Probability of profit: Estimate success probability using the option’s Delta
4. Maximum loss: Can you absorb it without impairing the overall portfolio?
5. Implied volatility level: Is current IV high or low, and how does that affect the strategy?

Position sizing

The maximum loss on any single options trade should not exceed a set fraction of the entire portfolio. Controlling position size helps ensure that a single loss does not cause irreversible damage to the portfolio.

For guidance on choosing between limit and market orders, see Limit Orders vs. Market Orders: Getting started with options execution. Longbridge Securities offers options trading on U.S. and Hong Kong stocks; you can learn more from our investment product information.

FAQs

How should option return be calculated?

Option return is calculated as: (Value at expiration − Initial premium paid) ÷ Initial premium paid × 100%. To compare across different holding periods, further compute the annualized return: Return × (365 ÷ Holding days). The maximum loss for an option buyer is the full premium paid up front.

What is a good Sharpe ratio?

Generally, a Sharpe ratio of 1.0 or above is considered good, while 2.0 or higher indicates strong risk-adjusted efficiency. Use it together with the Sortino ratio and maximum drawdown to avoid overreliance on a single metric.

How does return on capital (ROC) differ from simple return?

Simple return measures return relative to the option premium; ROC measures net premium relative to the maximum possible loss, making it better suited for comparing the efficiency of credit spreads and similar strategies.

Conclusion

Option performance should not be judged solely by absolute P&L. Annualized return, return on capital, the Sharpe ratio, the Sortino ratio, and maximum drawdown each reveal different facets of a strategy’s true risk–return profile; using them together enables an objective evaluation framework.

Which tools you use depends on your investment objectives, risk tolerance, market views, and experience. Whatever instrument you choose, you must fully understand its mechanics, risk characteristics, and trading rules, and establish a robust risk management plan. You can learn more through the Longbridge Academy or by downloading the Longbridge App.