Pricing model
Black-Scholes Calculator
Callculator uses Black-Scholes style estimates for non-expiration option values, with inputs for price, time, implied volatility, rates, and dividends.
Reviewed May 2026
What Black-Scholes estimates
Black-Scholes is a theoretical option pricing model. It estimates option value from the stock price, strike price, time to expiration, volatility, risk-free rate, and dividend yield.
- Calls and puts are estimated from the same core assumptions.
- Spread value is estimated by pricing each leg, then combining the legs.
- At expiration, Callculator uses intrinsic value instead of model value.
Important limitations
The model is theoretical. Real option prices can differ because of supply and demand, early exercise risk, dividends, borrow costs, liquidity, skew, and the bid-ask spread.
Common questions
Is Black-Scholes the same as a live market quote?
No. It is a model estimate. Market prices can be higher or lower than the theoretical value.
Does Black-Scholes include volatility skew?
No. Callculator applies the selected volatility assumption to the modeled legs. Market skew can make different strikes trade at different implied volatilities.
Why model each leg separately?
A spread is built from option legs. Estimating each leg separately makes it easier to calculate the combined value, cost, profit, and loss.