Options Greeks Calculator
Black-Scholes pricing + all five Greeks for any contract. Computed live in your browser — nothing tracked, no account needed.
How to read the Greeks
How much the option price moves per $1 move in the underlying. Calls: 0 to +1. Puts: -1 to 0. ATM options are around ±0.50.
How fast delta itself changes. Peaks at ATM and near expiration. High gamma = your delta swings violently with small price moves.
Daily time decay in dollars per contract. Always negative for buyers. Accelerates dramatically in the last 30 days. ATM options decay fastest.
How much the option price moves per 1 percentage-point change in IV. Higher when there's more time to expiration. Long options are vega-positive.
Sensitivity to 1pt change in risk-free rate. Usually small for short-dated retail options; matters more on LEAPS and during rate-cut cycles.
Intrinsic = ITM amount (zero if OTM). Extrinsic = the rest. Extrinsic decays to zero by expiration — that's the part theta is eating.