Covered Call Return Calculator
Options income strategy.
Calculate covered call premium income, annualised yield, and break-even price from stock price, strike, premium, and expiry length.
What this tool does
Selling a covered call generates premium income that increases yield on a held stock position. This calculator models the financial outcome of that strategy across your position size and time horizon. Enter your current stock price, the call strike price, premium received per share, days until expiry, and number of shares owned. The calculator estimates your total premium income, the yield generated by that premium, and annualises that yield across a full year for comparison. It also computes break-even levels—showing where your cost basis falls after accounting for premium collected—and identifies the assignment price at which your shares would be called away. The result illustrates income and assignment risk at a single point in time. Stock price movement, volatility changes, and early assignment are not modeled. This tool is for educational illustration of how covered call mechanics work with your specific numbers.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
Covered call strategy: own 100 shares, sell call options against them to generate premium income. Premium received reduces cost basis (downside protection) but caps upside if stock rises above strike. Most popular options income strategy. Annualised yields typically 8-25% on dividend-paying stocks vs 2-5% from dividends alone.
Example: own 100 shares at 50 (5,000 stock value). Sell 30-day call at 55 strike for 1.50 premium = 150 income. Annualised yield: 150 / 5,000 × (365/30) = 36.5% annualised. If stock stays below 55: keep premium and shares, repeat. If stock exceeds 55: shares called away at 55 (500 capital gain) + 150 premium = 650 total return on 5,000 = 13% in 30 days.
Covered call best on stocks you'd be happy to sell at strike price. Bad on high-growth stocks (cap upside while taking downside). Best on dividend payers and stable large-caps. Wheel strategy: sell covered calls when called away, sell cash-secured puts to re-enter, repeat. Generates income whether stock goes up, down, or sideways - just not unlimited upside if stock rallies hard.
A worked example
With the defaults: current stock price of 50, call strike price of 55, premium per share of 1.5, days to expiry of 30. The tool returns 150.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.
What moves the number most
The result responds to Current Stock Price, Call Strike Price, Premium per Share, Days to Expiry, and Shares Owned. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
The formula behind this
Premium income = premium per share × shares. Annualised yield = yield × 365/days. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.
Using this well
What this doesn't capture
This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.
100 shares × £1.5 premium over 30 days = $150.00.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes annual yield from a covered call strategy by taking the premium received per share, dividing it by the current stock price, then annualizing this return based on the days until option expiry. The formula multiplies the premium-to-price ratio by the factor 365 divided by days to expiry, expressing the result as a percentage. This approach assumes the premium is realised in full at expiry, the position holds for the stated duration, and returns compound at a constant rate throughout the year. The model does not account for transaction costs, assignment risk, taxes, dividends, changes in stock price, or the probability that the option expires worthless. It treats the covered call as a single income event rather than modelling ongoing strategy management or alternative outcomes.
References
Frequently Asked Questions
Best stocks for covered calls?
What strike to choose?
What if stock rallies?
What if stock drops?
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