Calculations use the Black-Scholes-Merton model with the entered risk-free rate and the underlying's reported dividend yield. Greeks shown are position-level (sign-flipped for short legs) and scaled by contracts × 100. "Probability of Profit" is the risk-neutral chance the underlying closes past breakeven at expiration — a rough estimate, not a forecast. Data via yfinance (Yahoo Finance), typically delayed ~15 minutes.