Core method
How an options profit calculator works
A payoff calculator takes the stock price at expiration, applies the strategy payoff formula, subtracts net debit or adds net credit, and multiplies by the contract multiplier and contract count.
The universal workflow
- Define whether premium is paid or received.
- Calculate intrinsic value at the target expiration price.
- Subtract the debit or add the credit.
- Multiply by 100 shares per standard equity-option contract, unless the contract has adjusted terms.
Why expiration math is useful
Expiration math strips away the noise so you can see the structural bet: where the strategy makes money, where it loses, and where it breaks even.
What it leaves out
Before expiration, option prices can change because of implied volatility, time decay, gamma, dividends, rates, and liquidity. That is why a payoff calculator is a planning tool, not a complete pricing model.
StrategyBreakevenMax lossRisk note
Long callStrike + premiumPremium paidNeeds upside move and time/volatility can matter before expiration.
Long putStrike - premiumPremium paidDownside move must overcome premium and friction.
Covered callShare basis - premiumStock downside less premiumUpside is capped if assigned; downside remains stock-like.
Cash-secured putStrike - premiumStrike less premium, to zeroAssignment can create stock ownership at an unfavorable basis.
Vertical spreadLong strike plus/minus net debitNet debit paidDefined risk and defined reward depend on spread width.
Primary reading: OIC Profit and Loss Simulator · FINRA options overview · SEC Investor Bulletin on options · OIC options pricing overview