2. Divide the amount of money you have available to invest in the stock by its current share price.
For example, if you have $1,000 to invest and a stock is trading for $40, this equals 25 shares. Of course, in the real world, you will probably not get a whole number, and that's why the next step is needed.
3. Determine the number of shares you can buy
If your broker allows you to buy fractional shares, or you got a whole number in the second step, the result is the number of shares you can buy. If you can't buy fractional shares, round down to the nearest whole number.