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Covered Call Calculator

A covered call has two outcomes and two returns. Enter the position to see both, annualised, with the break-even and the upside you agreed to give up.

Your shares

The call you sell

Return if called away—
Premium collected—
Static return (call expires worthless)—
Static return, annualisedenter days
Break-even price—
Upside you gave up above the strike—

A covered call trades unlimited upside for a fixed premium. It is not a low-risk position: the downside is the same as owning the shares, less the premium. The premium cushions a fall of exactly its own size and no more.

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Two outcomes, two returns

A covered call is shares you own plus a call you sold against them. At expiry only two things happen, and they pay differently:

static return   = premium ÷ your cost                       (call expires worthless)
if-called return = (strike − your cost + premium) ÷ cost     (shares are taken)

Own 100 shares at $48, sell a $55 call for $1.40 with 45 days to run: static is 2.92%, if-called is 15.42%.

Those are not two views of the same number — they are the returns from two mutually exclusive futures. Presenting whichever is larger as "the yield" is the standard way this strategy is oversold, which is why both sit on the page and neither is blended into a headline.

Annualising, honestly

A 2.92% static return over 45 days annualises to roughly 26%. That figure is real arithmetic and a poor forecast, for two reasons worth stating.

It assumes you can repeat the trade twelve times a year at the same premium. Premiums are highest when volatility is high, which is exactly when holding the shares is least comfortable — the good months are not evenly distributed.

And it assumes the shares are still there. Every time the call finishes in the money, the position is closed and has to be re-established, often at a higher price than you sold at.

What you actually gave up

The premium is not free income. It is payment for a specific thing: the upside above the strike.

If the shares run to $70, your $55 call caps the outcome at $55 plus the premium. The $15 of extra move belongs to whoever bought the call. On any single trade that is an acceptable exchange; repeated on a holding that trends upward, it is how a long-term position gets systematically truncated at the worst moments.

The downside, meanwhile, is unchanged. Owning the shares is the whole risk, and the premium cushions a fall of exactly its own size — $1.40 here, against a share worth $50.

The mistake the calculator flags

Selling a call below your cost basis guarantees a loss on the shares if assigned. It happens naturally: a position falls, and the strikes with worthwhile premium are all below where you bought.

The premium then has to cover the entire gap between your cost and the strike before the trade makes money, and it almost never does. The calculator raises this rather than returning a cheerful if-called return that is actually negative on the position as a whole.

FAQ

What is the difference between static and if-called return?

Static is what you keep if the call expires worthless — the premium alone. If-called adds the gain from your cost up to the strike, because the shares are sold there. They describe different outcomes, so neither is "the" return.

How do I annualise a covered call return?

Compound the period return over the number of periods in a year: (1 + return)^(365 ÷ days) − 1. A 2.92% return over 45 days annualises to about 26%, assuming the trade repeats at the same premium, which is the assumption doing most of the work.

Is a covered call low risk?

No — the downside is the same as owning the shares, reduced by the premium. It converts unlimited upside into a fixed payment, which lowers volatility rather than risk. A large fall costs you the same as it would without the call, less $1.40.

What strike should I sell?

Higher strikes keep more upside and collect less premium; nearer strikes collect more and get assigned more often. The one firm rule is not to sell below your cost basis unless you are willing to close the shares at a loss.

What happens if the stock goes above the strike?

The call is likely to be assigned and the shares are sold at the strike. That is the maximum outcome of the position, not a failure — though it does mean re-buying at a higher price if you wanted to keep the holding.

This is the plan. What did you actually do?

A calculator tells you the size you should have taken. It cannot tell you the size you took at 2pm after two losers, or how often your stop moved once price went against you. Drop in a statement from MT4/MT5, a broker CSV or a crypto export and see the answer for your own last 90 trades.

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