Options Break-Even Calculator: Single-Leg Strategy Math

Break-even price, max profit, and max loss for the four most-common single-leg strategies: long call, long put, cash-secured put, and covered call. Enter strike, premium, contract count, and a current or projected spot price. For covered calls, specify your share cost basis separately from the current spot so the math reflects your actual entry price rather than the live quote.

Strategies the Calculator Covers

Long call: break-even is strike + premium paid. Max profit is unlimited (above break-even); max loss is the premium paid. Long calls express a directional bullish view with positive convexity (long gamma, long vega) at the cost of theta decay.

Long put: break-even is strike - premium paid. Max profit is the strike minus the premium (achieved if the underlying falls to zero); max loss is the premium paid. Long puts express a directional bearish view with the same long-gamma/long-vega/short-theta profile mirrored.

Cash-secured put: break-even is strike - premium received. Max profit is the premium received (achieved if the put expires out of the money); max loss is strike - premium received - 0 if the underlying falls to zero. Cash-secured puts express a willingness to own the stock at the strike net of premium; the cash buffer covers the assignment.

Covered call: break-even is share cost basis - premium received. Max profit is premium received plus (strike - cost basis) if assigned; max loss is uncapped on the stock side, partially offset by the premium. Covered calls monetize the volatility risk premium against shares you already hold; the cost is the capped upside.

What the Math Assumes

All results are at expiration and assume European-style intrinsic-value math (no time value at expiry). Commissions are not modeled; subtract your per-trade cost to translate to net P/L. The expiration P/L curve is piecewise-linear, kinked at the strike: this is the textbook view that matters for break-even and max P/L. For pre-expiration P/L (which depends on time decay, IV changes, and spot moves), use the strategy builder, which computes Greeks across all legs and generates the full P/L surface across spot, vol, and time.

Where This Calculator Fits

Use this calculator for the four single-leg structures it covers when you want the break-even and max P/L numbers without the full Greeks dashboard. For multi-leg structures (vertical spreads, iron condors, butterflies, calendars, diagonals), the math is no longer a clean piecewise-linear formula and the strategy builder is the right tool. The strategies hub documents 12+ structures with payoff diagrams, IV-rank guidance, and adjustment mechanics for each.

When the Expiration P/L Curve Misleads

The expiration P/L curve is a clean diagram, but it can hide several real-world risks that show up before expiration. The most common ones to watch:

• Early assignment on American-style options. Cash-secured puts and covered calls can be assigned any business day before expiration if the contract is in the money and the counterparty exercises. Deep-ITM short calls with an upcoming ex-dividend date are particularly assignment-prone because the dividend can exceed the remaining time value.
• Pre-expiration P/L is path-dependent. A position that expires at break-even on the curve can spend weeks deep underwater first; if you size on the at-expiration max loss without considering interim drawdown, you may be forced out of the position before the path completes.
• Dividends shift the put-call relationship. An ex-dividend day moves the underlying lower by the dividend amount on the open, which the curve does not reflect. Cash-secured puts collected for income near a dividend date can finish ITM purely because of the ex-dividend drop.
• Liquidity risk at expiration. Closing out a deep-ITM short option on expiration day can be expensive if the bid-ask spread on the underlying is wide or if exercise-by-exception triggers automatically. The curve assumes a clean cash settlement at intrinsic value.

For pre-expiration P/L (which depends on time decay, IV changes, and spot moves), the strategy builder computes the full P/L surface across spot, vol, and time so you can see how the position behaves on the path, not just at the endpoint.