How to use it
Choose call or put and enter the spot price, strike, days to expiration, implied volatility, and a risk-free rate. The calculator returns the Black-Scholes theoretical price and the five Greeks: delta, gamma, theta (per day), vega (per 1% of volatility), and rho (per 1% of rate).
Reading the Greeks
Delta is directional exposure; gamma tells you how fast that exposure changes as the stock moves; theta is what you pay (or collect) in time decay each day; vega is your exposure to volatility itself; and rho — usually the smallest — is interest-rate sensitivity. Together they describe how a position will behave before expiration, not just at it.
A note on the model
Black-Scholes assumes European exercise, no dividends, and constant volatility, so treat the outputs as a solid approximation rather than an exact market price — especially for American options and around dividends or earnings.
TradeCaliper is a planning and education tool, not financial advice.