Options Profit/Loss Calculator

Frequently Asked Questions

What is the maximum loss on a long option?

For a long call or put, your loss is capped at the premium paid. For a naked short call, loss is theoretically unlimited. For a naked short put, loss is capped at strike minus premium (still potentially large).

What is the break-even on a call?

Strike price + premium paid. A $100 strike call bought for $3 breaks even at $103 at expiration. The stock must move enough to overcome the premium AND any time decay.

What does "in/at/out of the money" mean?

For a call: ITM = strike below stock price; ATM = strike equals stock price; OTM = strike above stock price. ITM options have intrinsic value; OTM options are pure time value and decay to zero if the stock does not move.

Why do most options expire worthless?

A widely cited (and somewhat misunderstood) statistic: roughly 70-80% of OTM options expire worthless because they require not just direction but also magnitude and timing. Buying OTM options is a low-probability, high-payoff bet.

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Estimates only. Not investment advice.

Investment Disclaimer: Estimates only. Not investment advice.

This calculator provides estimates for educational purposes only and is not investment advice. Past performance does not guarantee future results. Consult with a qualified financial advisor before making investment decisions. All investments carry risk, including potential loss of principal.

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How This Calculator Works

This tool computes realized profit and loss at expiration - not theoretical value - for a single−leg call or put, long or short. It evaluates intrinsic value at the expiry price: max(0, Sᵗ − K) for a call, max(0, K − Sᵗ) for a put. Long P/L per share = intrinsic − premium; a short position is simply the negative of that. It multiplies by contracts × 100 shares, derives the break−even (call: strike + premium; put: strike − premium), and builds a nine−point scenario table spanning roughly ±30% of the strike so you can see the payoff shape across outcomes. It deliberately ignores time value, so it tells you what you keep if held to expiration, not the mark−to−market P/L beforehand.

Short (Written) Positions

Writing options inverts the payoff: you collect the premium up front and that is your maximum profit. A naked short call carries theoretically unlimited loss because the underlying can rise without bound - the single most dangerous retail options position. A short put has loss capped at (strike − premium), economically similar to a covered−stock obligation. Short positions also face early assignment on American−style options, especially around dividends, which this expiration−only model does not capture.

Make the Estimate Realistic

Price the premium at the bid/ask mid; the spread is a real cost you pay twice (entry and exit).

Subtract commissions and fees - roughly $0.65 per contract is typical and erodes thin trades.

Remember theta: a long option loses time value every day even if the stock is flat, so the actual path matters, not just the expiry price.

This is an educational model, not trade advice - options can lose 100% of premium quickly, and short options can lose far more; consult a licensed professional before trading.

Options Profit/Loss Calculator

Frequently Asked Questions

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