Covered call calculator
A covered call calculator turns four inputs, your cost basis, the strike, the premium and the days left, into the three numbers that decide the trade: what you keep if the stock does nothing, what you make if you are called away, and how far the stock can drop before the premium stops covering you.
What each number is telling you
Static return is the premium alone, measured against the current share price, assuming the stock finishes anywhere below your strike. It is the base case. Most covered calls resolve here.
If-called return adds the capital gain from your cost basis up to the strike. It is your ceiling. Everything above the strike goes to whoever bought your call, and no amount of being right about the stock changes that.
Break-even is cost basis minus premium. Not strike minus premium. People get this wrong constantly, because the option textbooks describe a naked call and you are not selling one.
Downside cushion is the honest framing of what a covered call actually buys you. Sixty-two cents on a 71 dollar stock is a 0.87% cushion. That is a bad afternoon, not protection. A covered call is a yield trade with a small buffer attached, and anyone selling it to you as a hedge is selling you something else.
The annualized number, and why to distrust it
Annualized return is period return times 365 divided by days held. A 0.87% return over 38 days annualizes to 8.3%, which looks great next to a savings account.
It assumes you find the same trade again the day this one closes, nine and a half more times, at the same premium, with the same risk. You will not. IV drops, the stock gaps, earnings land in the window, and two of those cycles you are sitting in shares you cannot write against without locking in a loss. Use annualized to compare a 21-day trade against a 45-day trade. Do not use it to forecast your year.
A worked example
Say you hold 100 shares of KO bought at 68.00 and the stock is at 71.40. You sell the 75 call, 38 days out, for 0.62.
- You collect 62 dollars, and it is yours the moment the trade fills.
- Static return: 0.62 / 71.40 = 0.87%, or about 8.3% annualized.
- If-called: (0.62 + 7.00) / 71.40 = 10.67%, or about 102% annualized, which tells you the trade is really a bet on getting called away.
- Break-even: 68.00 - 0.62 = 67.38.
- Max profit: 762 dollars, and not one cent more if KO prints 90.
Now the part the calculator will flag but people ignore. If your cost basis were 78 instead of 68, that same 75 strike locks in a 300 dollar loss on the shares against 62 dollars of premium. The trade goes from good to indefensible on one input, and it is the input nobody checks.
Questions people actually ask
Is the break-even the strike minus the premium?
No. On a covered call your break-even is your cost basis minus the premium, because you own the shares. Strike minus premium is the break-even for a short put. The two get mixed up because both trades have the same payoff shape.
Should I use the bid, the ask, or the mid for the premium?
Use the mid to plan and the bid to be conservative. You are selling, so the bid is what a buyer will hit right now. On a liquid name you will usually fill somewhere between the two. On a wide spread, the difference between mid and bid is a real chunk of the trade, which is a reason to skip illiquid chains entirely.
What happens if the stock closes one cent above my strike?
You get assigned. Your broker sells your 100 shares at the strike, the premium stays yours, and you wake up Monday holding cash instead of stock. Anything a penny or more in the money at the close is auto-exercised by the OCC unless the holder opts out.
Does this calculator account for dividends?
Not on this page, and the omission matters most right before an ex-dividend date, when the call holder can exercise early to capture the dividend. The wheel calculator has a dividend input for the full cycle.