Hi..
why do you want to calculate the intrinsic value to stock? to know if its undervalued or overvalued?
I am not from Finance background..but below is my take on it..
Stocks are basically ownership in companies...so their intrinsic value should be equal to net income of a company after debt/interest payments divided by number of shares...
But i guess to derive the value you will need to know how to read the balance sheet of a company...