How to use this calculator
- Enter option type, position, underlying price at expiry, strike price, premium per unit, underlying units covered.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Expiry-only arithmetic; no pricing model, time value, fees, taxes, early assignment or margin. Short call loss is theoretically unlimited.
Worked example
For the sample inputs shown above, option expiry payoff produces a first result of approximately 20. The assumptions below explain what this result represents.
What the result means
Calculate expiry profit/loss for a single option position at an entered underlying price.
Common questions
How is the calculation performed?
Call intrinsic=max(S−K,0); put=max(K−S,0). Long profit=(intrinsic−premium)×units; short profit is its negative.
What does the model leave out?
Expiry-only arithmetic; no pricing model, time value, fees, taxes, early assignment or margin. Short call loss is theoretically unlimited.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.