Build a single option or a multi leg trade and see what it makes or loses at every price on expiration day, with the breakevens and the most it can make or lose.
Net cost to open (debit you pay, credit you collect)
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Max profit
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Max loss
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Breakeven price(s)
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At expiration if unchanged
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Profit or loss at expiration
How it works
At expiration an option is worth only what it is in the money: a call is worth the stock price above the strike and a put the amount below it. Subtract what you paid, or add what you collected, and you have the profit or loss.
Adding legs shapes the payoff. A bought call alone has unlimited upside; selling a higher call against it caps the upside but lowers the cost. The chart shows the result across a range of prices.
The formula
Call value at expiration = max(Price − Strike, 0)
Put value at expiration = max(Strike − Price, 0)
Leg result = (Value − Premium paid) × 100 × Contracts, with the sign flipped for a sold leg
Trade result = the sum of every leg
Worked example
Buy one $100 call for $5 and sell one $110 call for $2, a bull call spread. It costs $3 a share, or $300. Above $110 both calls are in the money and the trade makes the most it can, $1,000 − $300 = $700. Below $100 both expire worthless and you lose the $300. The breakeven is $103.
Options Profit and Loss questions
Does this show profit before expiration?
No. It shows the result on expiration day, when only the intrinsic value is left. Before then, time value and volatility change prices, so an open trade can be worth more or less than this.
Why multiply by 100?
A standard US stock option covers 100 shares, so a $5 premium costs $500 per contract.
What does unlimited mean here?
A trade that is long a call with nothing sold above it keeps gaining as the stock rises, so there is no cap. A trade short a call with nothing bought above it has unlimited risk.
Can I add the stock itself?
Yes. Choose Stock as the leg type, enter the shares in the contracts box and your purchase price as the premium; a covered call is one stock leg plus one sold call.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Results are estimates from the numbers you enter.