Binomial Option Pricing Calculator

This simple calculator estimates the value of a European call option using a one-step binomial option pricing model.

Enter the inputs below, then click Calculate to see the stock prices in each state, the risk-neutral probabilities, the option payoffs, and the option value today.

Inputs

Use the class example or enter your own values.

FYI only: this version uses the simple one-step classroom formula with the time input included in the probability expression.

Results

Stock price if up
S × u
Stock price if down
S × d
Option value today
One-step binomial value
Up-state probability
Pu
Down-state probability
Pd = 1 − Pu
Call payoff check
/
Up-state / Down-state payoff
Detailed calculation