Diagonal Spread Calculator

Your diagonal spread

Underlying and setup

Diagonal type

Long (far) leg — bought

Short (near) leg — sold

Pricing and position

Results (estimates)

The far leg is priced with Black-Scholes assuming your IV holds at the near expiration. Profit and breakeven move with IV; net debit and max loss are exact.

Spread type
Net debit (max loss)
Estimated max profit
Max loss
Lower breakeven
Upper breakeven
Return on debit
Far leg life at near expiry

Probability of profit

Best guess — modeled at the near expiration, valuing the longer-dated leg with Black-Scholes and assuming the implied volatility above holds. A two-expiration estimate, not a prediction; it ignores volatility skew, early assignment and dividends. Real outcomes will differ.

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