Covered Call Calculator
Computes the annualised return on a covered call position based on the premium collected relative to the stock's cost. Use it when evaluating whether selling a call option against existing shares generates adequate income.
About this calculator
A covered call is an options strategy where an investor who already owns shares sells (writes) a call option on those shares, collecting a premium upfront. The income from the premium is retained regardless of whether the option is exercised. The key metric is the annualised return on the premium: Annualised Return (%) = (optionPremium / stockPrice) × (365 / daysToExpiration) × 100. Note that shares cancel out of this ratio, making it a per-share calculation. The breakeven price at expiration is stockPrice − optionPremium: the stock must fall below this level before the strategy incurs a net loss. If the stock rises above the strike price, shares may be called away, capping upside. This trade-off — premium income versus forfeited upside — is the central consideration when evaluating any covered call.
How to use
You own 100 shares of a stock trading at $50. You sell one call option with a strike price of $55, collect a $1.50 premium per share, and the option expires in 30 days. Annualised Return = ($1.50 / $50) × (365 / 30) × 100 = 0.03 × 12.167 × 100 = 3% × 12.167 ≈ 36.5% annualised. Breakeven = $50 − $1.50 = $48.50. Maximum profit per share = $1.50 (premium) + ($55 − $50) (capital gain if called) = $6.50, achieved if the stock is at or above $55 at expiration. Total premium received = $1.50 × 100 shares = $150.
Frequently asked questions
What is the maximum profit and maximum loss on a covered call strategy?
The maximum profit on a covered call is capped at the premium received plus any capital gain up to the strike price. If you paid $50 for the stock, the strike is $55, and you collected $1.50 in premium, your maximum gain per share is $6.50 regardless of how high the stock climbs. The maximum loss is substantially larger: if the stock falls to zero, you lose the full purchase price minus the premium received ($50 − $1.50 = $48.50 per share). The covered call improves your downside modestly through the premium but does not provide meaningful protection against large declines.
When should an investor consider selling covered calls on their stock holdings?
Covered calls are most effective in flat to mildly bullish markets where the stock is not expected to make large upward moves before expiration. They are popular when an investor is willing to sell the stock at the strike price and wants to earn income while waiting. They are less suitable when the investor expects a strong rally, since the premium earned is small compensation for capping a potentially large gain. Many investors sell covered calls monthly on dividend-paying stocks to generate a second income stream layered on top of dividends.
How does the strike price selection affect covered call returns and risk?
Choosing a strike price closer to the current stock price (at-the-money or slightly out-of-the-money) generates more premium income but leaves less room for the stock to appreciate before shares are called away. A strike price far above the current price (deep out-of-the-money) allows more upside participation but collects a much smaller premium, reducing annualised yield. The delta of the option is a useful guide: a delta of 0.20–0.30 is a common sweet spot, reflecting roughly a 20–30% probability of being exercised while still providing meaningful income. Strike selection ultimately reflects your view on the stock's near-term direction and your income targets.