About the Option Profit Calculator
Option Profit Calculator is a free online tool that works out what a call or put option is actually worth at expiration — the profit or loss in dollars, the return in percent, the breakeven stock price and the most you can win or lose on the position.
What the tool does
The calculator handles the four positions every option strategy is built from, and recalculates every output the moment you change an input:
- Long call — limited loss, unlimited upside
- Long put — limited loss, profit as the stock falls
- Short call — premium capped, unlimited risk
- Short put — premium capped, large downside risk
You enter the strike price, the premium per share, the stock price at expiration, the number of contracts and an optional commission. The tool returns profit and loss, ROI, the breakeven price, max profit, max loss, a payoff chart and a table of outcomes across a range of stock prices.
How the numbers are calculated
There is no hidden model here. Every result comes from the standard expiration payoff formulas: intrinsic value minus premium, multiplied by the contract size of 100 shares and the number of contracts, with commissions subtracted. A call is worth max(stock price − strike, 0) at expiration; a put is worth max(strike − stock price, 0). Nothing else is assumed.
What it deliberately leaves out
These are expiration payoffs. The calculator does not model time value, implied volatility, interest rates, dividends, early exercise or assignment. An option position can be profitable at expiration and deeply underwater a week after you open it, and this tool will not tell you that. It answers one question precisely: what does this contract pay if it is held to the end.
Free, private and browser-based
Everything runs in your browser. There is no account, no sign up, and the numbers you type are never sent to a server or stored anywhere.
Not financial advice
This site is educational. It is not financial, investment or tax advice, and it is not a recommendation to enter any trade. Options can lose their entire value quickly, and selling options can lose far more than the premium received. If you have a question or spot a mistake in a calculation, please get in touch.