Options Probability Calculator
Estimate the probability that an option expires in or out of the money, based on underlying price, strike, days to expiration, and implied volatility.
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Calendar days until expiration
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Enter option details above and click Calculate probabilities to see the probability of expiring in or out of the money.
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Probability Formula (Black-Scholes d2)
d2 = (ln(S/K) - 0.5 × σ² × T) / (σ × √T)
Call P(ITM) = N(d2) | Put P(ITM) = N(-d2)
Where: S = price, K = strike, σ = IV, T = time in years