Selling a call against shares you own turns a stock position into an income trade. Enter stock price, strike, premium and days to expiration to see your breakeven, max profit, and annualized returns.
Answer first: a covered call means you own 100 shares and sell one call option against them, collecting a premium today in exchange for capping your upside at the strike price until expiration. This calculator turns that trade into four numbers: your breakeven (stock price minus premium), your maximum profit (strike minus stock price, plus premium), the static return if the stock goes nowhere, and the if-called return if the shares get assigned at the strike — both annualized so different expirations compare fairly.
Breakeven = stock price − premium · Max profit = (strike − stock + premium) × 100
Example: buy at $50, sell the 30-day $55 call for $1.50 → breakeven $48.50, max profit $650 per contract, static return 3.0% (≈36% annualized), if-called return 13.0% (≈158% annualized).
| At expiration | What happens | Your result |
|---|---|---|
| Stock below breakeven | Call expires worthless, you keep shares + premium | Loss, cushioned by the premium |
| Between breakeven and strike | Call expires worthless | Premium + any stock gain — the sweet spot |
| Above the strike | Shares called away at the strike | Max profit — but you miss everything above it |
A 3% premium in 30 days annualizes to roughly 36% — and that figure deserves suspicion, not celebration. Options markets price premium according to expected volatility: fat premiums live on stocks the market expects to move violently. The annualized return assumes you can repeat the trade every month at the same terms with no losing months, which never quite happens. Treat annualization as a comparison tool between two candidate trades, not a forecast of yearly income.
Covered call sellers rarely get hurt by the trades that expire quietly; the damage comes from the one stock that doubles after being called away at the strike. The strategy converts uncertain large gains into steady small ones — brilliant in flat and gently rising markets, expensive in roaring bull runs. If you would genuinely mind selling your shares at the strike price, that strike is too low, or the trade is not for you.
Reality check: premiums here exclude commissions and assignment fees, and early assignment can occur before expiration, particularly around ex-dividend dates. Selling calls on shares you would hate to lose is the classic covered-call regret. Educational tool only — not financial advice.
See also the cash-secured put calculator — the mirror-image trade — plus the options profit calculator, options breakeven calculator and the guide to options Greeks. Practice risk-free in the options trading game.
Last updated July 2, 2026 · Written by Mustafa Bilgic. Educational only — not financial advice.
Max profit = (strike − stock price + premium) × 100 per contract, earned if shares are called away. If the stock stays below the strike, you keep the premium and the shares.
Your purchase price minus the premium received. Buying at $50 and collecting $1.50 in premium means the position starts losing money only below $48.50.
Static return assumes the stock finishes unchanged, so you earn just the premium. If-called return assumes assignment at the strike, adding the capital gain from stock price to strike.
Your upside is capped at the strike while your downside is only cushioned by the premium. In strong bull markets, covered call writers systematically underperform simply holding the shares.
Yes. American-style options can be exercised early, most commonly just before an ex-dividend date when the dividend is worth more than the option's remaining time value.