Black Scholes formula
C = SPe-dtN(d1) - STe-rtN(d2)
P = STe-rtN(-d2) - SPe-dtN(-d1)
C is the value of the call option
P is the value of the put option
N (.) is the cumulative standard normal distribution function
SP is the current stock price (spot price)
ST is the strike price (exercise price)
e is the exponential constant (2.7182818)
ln is the natural logarithm
r is the current risk-free interest rate
t is the time to expiration in days
European Call Value
A call option allows the holder to buy shares of stock at the strike price in the future.
European Put Value
A put option allows the holder to sell shares of stock at the strike price in the future.