This calculator gives the risk neutral probability that a stock with the specified current price, and volatility, will be within the given price range at the specified date. The risk neutral probability is the assumption that the expected value of the stock price grows no faster than an investment at the risk free interest rate.

This is illustrated by the following equation

$$ t = \dfrac {enddate \hspace1ex time -startdate \hspace1ex time} {1 \hspace1ex day \hspace1ex milisecond } $$

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