Long Option Profit Calculator
Compute the expiry profit, break-even and return of a long call or long put from strike, premium and underlying price.
How it works
Call payoff = max(S − K, 0) − premium · Put payoff = max(K − S, 0) − premium · Total = payoff × 100 × contracts
A long option gives you the right, not the obligation, to buy (call) or sell (put) at the strike. At expiry only intrinsic value remains: a call is worth the amount the underlying sits above the strike, a put the amount it sits below. Subtract the premium you paid to get profit. Your maximum loss is always the premium, while a call has unbounded upside and a put gains as the underlying falls toward zero.
Worked example
Buy one $100 call for $5 with the stock at $110 at expiry. Intrinsic = 110 − 100 = $10. Profit per share = 10 − 5 = $5, times 100 = $500. Break-even = 100 + 5 = $105.
Frequently asked questions
What is the most I can lose on a long option?
The premium you paid, and no more. If the option expires worthless you lose 100% of the premium, but you are never obligated to add money the way a short position can require.
How is break-even calculated?
For a call it is the strike plus the premium; for a put it is the strike minus the premium. That is the underlying price at which your intrinsic value exactly repays what you paid.
Does this include time value?
No. This is the value at expiration, when time value has decayed to zero and only intrinsic value is left. Before expiry the option can trade above intrinsic value.
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Educational estimate, not investment advice. Options and leveraged positions carry substantial risk.