A covered call is one of the most popular income strategies for long stock holders: you already own the shares, and you sell someone else the right to buy them from you at a fixed price (the strike) before the option expires. In exchange you collect a premium up front. The trade-off is simple: you cap your upside above the strike, but you lower your cost basis and get paid today. This covered call calculator shows exactly how much money you can make, how much you can lose, where your breakeven sits, and what your return will be if the stock gets called away.
Type your shares, your cost basis, the strike you sold, and the premium you received. Every figure below updates instantly, so you can model different strikes and expiry months side by side.
How to Use
- Enter the Shares Owned you are already long. One standard U.S. equity call contract covers 100 shares, so if you sold one contract on 100 shares, type 100.
- Type your Cost Basis per Share — the price you actually paid for the stock, including commissions and fees. Do not use today's market price; the strategy's profit and loss is measured against what you paid.
- Set the Short Call Strike — the price at which the buyer can call your shares away. A strike above your cost basis locks in a gain; a strike at or below your basis creates extra income on a flat or slightly down stock.
- Enter the Call Premium Received per share. Remember that quoted option premiums are per share, so a $2.00 quote equals $200 per 100-share contract before fees.
- Optionally add the Current Stock Price to see how close the trade is to being in-the-money and likely to be exercised.
The result card breaks out your net investment, the cash you pocketed today, the maximum profit you earn if the stock rallies to the strike, the worst-case loss if the stock collapses, your breakeven price, and the percentage return you realize on the capital tied up if the shares are called.
The Covered Call Formulas
A covered call payoff is linear and has four anchors. Per share:
- Max Profit = (Strike − Cost Basis) + Premium Received
- Max Loss = Cost Basis − Premium Received (the stock going to $0)
- Breakeven = Cost Basis − Premium Received
- Return if Called = Max Profit ÷ Net Investment × 100
Worked example: you own 100 shares bought at $50.00, sell a $55.00 call for $2.00 per share. Your maximum profit is ($55 − $50) + $2 = $7.00 per share, or $700 total. Your breakeven drops to $50 − $2 = $48.00 per share, so the stock can fall $2.00 before you are underwater. Your worst case is still ugly — if the stock goes to zero you lose $48.00 per share ($4,800) — but the premium cushions the blow by $200. If called away, you earn $700 on a $5,000 position, a 14.0% return on the trade.
Why Traders Sell Covered Calls
Covered calls do three things at once. First, they generate income in sideways or slow-trending markets where you would otherwise hold a stock for nothing. Second, they lower your effective cost basis by the amount of the premium, so you can absorb a modest pullback without turning a profit into a loss. Third, they force a disciplined exit: if the stock rips past your strike, you walk away with a defined gain instead of watching an unrealized profit evaporate in a pullback.
The price of that comfort is a hard cap on upside. If the stock doubles the day after you sell the call, your shares still get sold at the strike and you miss everything above it. That is why covered calls work best on stocks you are comfortable holding long-term or are happy to sell at the strike you chose.
Examples
Example 1 — The textbook setup. You own 100 shares at $50.00, sell a $55.00 call for $2.00. Net investment is $5,000, premium collected is $200. If the stock stays below $55, you keep the shares and the $200. If it rallies to $55 or above, your shares are called away and you book $700 — a 14.0% return. Your breakeven is $48.00.
Example 2 — Zero premium (deep out-of-the-month sale). You sell a call expiring this week that the market prices at nearly $0.00. With premium = $0.00 on the same 100-share / $50 basis / $55 strike trade, max profit is still $500, but your breakeven rises back to $50.00 and your maximum loss is the full $5,000. Selling a call with no premium gives you no downside protection.
Example 3 — Large position. On a 1,000,000-share long position with a $50 basis, a $55 strike, and $2.00 premium, net investment is $50,000,000, premium collected is $2,000,000, and if called away you bank $7,000,000 — still a 14.0% return. The engine scales linearly, so per-share math always holds no matter how large the position.
FAQ
What is the maximum profit on a covered call?
Maximum profit happens when the stock closes at or above the short strike at expiration. It equals (strike − cost basis) plus the premium you received, multiplied by your shares. Above the strike, any further gain belongs to the call buyer, so your profit does not grow.
What is my maximum loss?
Maximum loss occurs if the stock goes to $0. You lose your cost basis on the shares, offset only by the premium you collected. Practically that is (cost basis − premium) per share. The premium is the only downside protection a covered call offers — it does not protect against a real crash.
What is my breakeven price?
Your breakeven is your cost basis minus the premium you received. If you bought at $50 and collected $2, your breakeven is $48. Below $48 you start losing money on the combined position; above $48 you profit, up to the strike.
What does "return if called" mean?
It is the percentage return you earn on the capital you have tied up in the stock, assuming the stock is above the strike at expiration and your shares are sold. It equals (max profit ÷ net investment) × 100. This is the number traders compare against a dividend yield or a target annualized return.
When should I sell a call at-the-money vs. out-of-the-money?
Out-of-the-money calls (strike above current price) give up some premium in exchange for keeping more upside and a better chance the shares stay in your portfolio. At-the-money calls collect more premium and offer more downside protection, but are much more likely to be assigned. Pick a strike where you would actually be happy to sell your shares.
Are covered calls risky?
The position is still long stock, so the main risk is a sharp decline in the shares — the premium only cushions the first few dollars. The strategy is conservative compared with naked calls, but it is not a hedge. You can still lose most of your investment if the stock collapses.
Disclaimer
This covered call calculator is provided for informational purposes only and does not constitute financial, investment, tax, or legal advice. Figures are based on the inputs you enter and the standard covered-call payoff formulas; they exclude commissions, fees, assignment timing, dividends, bid-ask spreads, and early-exercise risk. Options trading involves substantial risk and is not suitable for every investor. Always verify prices, Greeks, and assignment rules with your broker and consider consulting a licensed financial advisor before entering any options position.