Stock Option Greeks Calculator
Calculate Black-Scholes call and put values plus Delta, Gamma, Theta, Vega, and Rho from stock price, strike, expiry, rates, and volatility.
Last updated: 2026-03-27
Stock option Greeks calculator
Enter your values
Estimate theoretical call and put values plus Delta, Gamma, Theta, Vega, and Rho from one set of option assumptions.
Call / Put Value
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Enter stock price, strike, rates, expiry, and volatility to estimate theoretical value and option sensitivity.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Near-the-money call/put
$105 stock, $100 strike, 45 days
A common scenario for learning how Delta, Gamma, and Theta interact near the strike.
Result: Both theoretical value and sensitivity stay meaningful because time value is still present
Longer-dated out-of-the-money option
$90 stock, $100 strike, 120 days
Illustrates how Vega matters more when an option is out of the money but still has time.
Result: Lower Delta but a more volatility-sensitive setup than an expiring contract
How the Black-Scholes Greek model works
The calculator applies the standard Black-Scholes closed-form equations to one set of assumptions and returns both call and put values, plus the core Greeks that drive option sensitivity.
This is most useful as a baseline or learning model. Dividend assumptions, early exercise, skew, and live bid/ask markets can all move real quotes away from the values shown here.
Stock option Greeks FAQs
Use the model for baseline option intuition, not as a live execution engine.
What do the Greeks measure?
Delta estimates price sensitivity to a stock move, Gamma measures how quickly Delta changes, Theta estimates time decay, Vega shows volatility sensitivity, and Rho measures rate sensitivity.
Why are both call and put prices shown?
Because the same underlying assumptions generate both values in Black-Scholes. Showing both makes the calculator more useful without adding another toggle or hiding the put side.
Why can broker prices differ from this page?
Real-market values can differ because of dividends, volatility skew, early-exercise features, bid/ask spreads, and changing rates. This page is a baseline model, not a live-market quote engine.
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Disclaimer
This page is for educational use only and is not trading, financial, or tax advice.
Black-Scholes is a baseline model and does not capture dividends, early exercise, volatility skew, or market microstructure.