| Expiration Price | Net Profit / Loss |
|---|
How this option profitability calculator works
This calculator estimates your net profit or loss on a single-leg options trade at expiration. You choose a strategy (long call, long put, short call, or short put), enter the strike and premium, then test any expiration price. The result includes total P/L in dollars, break-even level, and risk profile.
Options are quoted per share, but contracts typically represent 100 shares. That is why a $3.50 premium usually means $350 per contract before fees. The calculator handles that multiplication automatically so you can focus on decision-making.
Core formula used
Step 1: Intrinsic value at expiration
- Call intrinsic value: max(0, stock price at expiration - strike price)
- Put intrinsic value: max(0, strike price - stock price at expiration)
Step 2: Profit per share
- Long call / long put: intrinsic value - premium
- Short call / short put: premium - intrinsic value
Step 3: Net profit
Net profit = (profit per share × contracts × multiplier) - fees. The calculator also displays break-even, maximum profit, and maximum loss where applicable.
Interpreting your outputs
- Break-even: the expiration price where your P/L is approximately zero before slippage and taxes.
- Max loss: the worst-case scenario for that strategy if held to expiration.
- Max profit: capped for some strategies (short premium trades), unlimited for others (long call, short call risk is unlimited loss).
- ROI estimate: rough efficiency metric based on debit paid, max risk, or net credit.
Practical strategy notes
Long call
Best when you are bullish and want defined downside. You can only lose the premium paid plus fees, while upside expands as the stock rises above break-even.
Long put
Used for bearish positioning or portfolio protection. Your maximum loss is limited to premium paid, and gains increase if the stock drops below break-even.
Short call
Income-focused but carries substantial risk when uncovered. Profit is capped at premium received, while potential loss grows if price rallies strongly.
Short put
Often used by investors willing to buy stock lower. You collect premium up front, but losses can become large if the stock falls sharply.
Risk management checklist before trading
- Define exit rules before entry (target, stop, time stop).
- Check implied volatility and upcoming events (earnings, macro data).
- Limit position size to a small percentage of portfolio risk.
- Understand assignment risk for short options.
- Review broker margin requirements, especially for naked options.
If you want a better planning workflow, run multiple expiration prices with the scenario table above. This helps you see how sensitive your trade is to different outcomes, instead of relying on one single forecast.