When you begin trading on Forex, you have to learn how to convert currencies and note the difference in values, as well as how currencies are exchanged between international lines.

Since Forex is the Foreign Exchange Market, there are many variables and volatile currencies being exchanged, how can you compare the value of a stock across international lines if the values are expressed in two separate, non-equivalent currencies? How do you measure gains and losses when conversion rate is constantly changing?

The first step is to find a source that will give you a basic idea of the current exchange rate between your domestic currency and the chosen foreign currency.  You should do this as a base listing for any currency that with which you might become involved. However, this will not be consistent down to the cent or fraction of a particular currency throughout an entire business day, but at least you will have your starting point from which to begin. Such sources can be found all over the Internet or through forex brokers.