Covered Call Calculator

Covered Call at a glance

How a covered call works

The call you sell gives someone else the right to buy your shares at the strike. In return you receive premium immediately, which lowers your effective cost on the stock and adds income if the shares go nowhere. If the stock rises above the strike, your gains stop there because the shares will likely be called away. If the stock falls, the premium cushions the decline only by the amount collected, so you still carry nearly all the downside of owning the shares.

At expiration the payoff rises with the stock up to the call strike and then goes flat. That flat top is your maximum profit: the gain on the shares up to the strike plus the premium. Below the breakeven the line falls almost exactly like stock alone. Thanks to put call parity, the expiration payoff is nearly identical to a cash secured put at the same strike. The difference is that you own the shares from day one, so you collect dividends and carry stock exposure immediately.

Before expiration, the call loses time value each day, which adds to your profit while the stock is stable. A rally helps the shares but hurts the short call, so the position gains more slowly than stock alone. A drop in implied volatility lowers the call's price and helps you, while a volatility spike raises it. Using a strike above the current price, as the calculator does, leaves room for some upside before the cap applies.

Covered Call example with real numbers

With the stock at $100, implied volatility at 30%, a 4.1% risk free rate and no dividend, you would buy 100 shares at $100.00, sell 1 102.5 call (32 days) at $2.63. That is a net debit of $9,737. At expiration a maximum profit of $513 and a maximum loss of $9,737, with a breakeven at $97.37. The lognormal chance of profit is 62%.

These are theoretical American option prices from the Bjerksund and Stensland model, not live quotes. Load any ticker in the covered call calculator above to run the same math on real market prices.

When to use a covered call

• You own or want to own the stock and expect it to drift sideways or rise modestly.
• You are willing to sell the shares at the strike and want to be paid while you wait.
• Implied volatility is high enough that call premiums meaningfully lower your cost basis.
• You want income from a long term holding without adding leverage.

Max profit, max loss and breakeven

Maximum profit

Call strike minus stock purchase price plus premium received, times 100. You reach it when the stock closes at or above the call strike at expiration and the shares are called away.

Maximum loss

Stock purchase price minus premium received, times 100, if the stock falls to zero. The premium only partly offsets a large decline in the shares.

Breakeven

Stock purchase price minus premium received per share. At expiration the position is profitable above this price.

Covered Call Greeks

• Delta: Delta is positive but lower than owning 100 shares, because the short call's delta is subtracted from the stock's delta of one per share. As the stock rises past the strike, net delta falls toward zero.
• Gamma: Gamma is negative, coming entirely from the short call. Upside participation shrinks as the stock rallies, while downside exposure grows back toward that of the full stock position.
• Theta: Theta is positive. The short call's time decay is the income engine of a covered call, and it is strongest when the stock sits near the strike.
• Vega: Vega is negative. Higher implied volatility raises the call's price and hurts the position on a mark to market basis, while lower volatility helps.

See the live numbers for your position in the Greeks tab of the calculator, or explore a single option in the options Greeks calculator.

Early exercise and assignment risk

The biggest American style risk for a covered call is dividend driven early assignment. On the last trading day before an ex dividend date, the owner of an in the money call compares the dividend with the call's remaining time value. If the dividend is larger, exercising captures it, so you may be assigned that night. Your shares are delivered at the strike, you keep the premium, and you miss the dividend you were counting on. The calculator's American pricing shows the time value left so you can judge this risk before the ex date.

Early assignment on a covered call is not a loss in the usual sense, because it locks in the trade's maximum profit. The real costs are the missed dividend, losing a stock you wanted to keep, and possibly a taxable sale. To lower the odds, roll the call up and out to a later expiration before the ex date, which restores time value. Pin risk also applies when the stock closes near the strike on expiration day, since you may not know whether you still own the shares until the next morning.

The calculator's Early exercise risk tab flags short legs that are likely to be assigned. For a single option, use the early exercise calculator or read how early exercise and assignment work.

Pros and cons

How to manage a covered call

• Roll the call up and out for a credit when the stock nears the strike and you want to keep the shares.
• After a decline, buy back the call cheaply and sell a new one, choosing a strike you would still be happy to sell at.
• Check ex dividend dates every cycle and roll or close in the money calls whose time value is below the dividend.
• If your shares are called away, consider selling a cash secured put to reenter, the other half of the wheel strategy.

Covered Call FAQ

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Educational tool, not financial advice. Calculations are theoretical and depend on your inputs; real fills, fees, early assignment and dividends can change results. Options involve risk and are not suitable for every investor.