Currency converters are tools used to calculate the basic currency exchange rate between international entities. These can be found on sites like Google or Yahoo as widgets. However, the stock market, banks, and other corporate entities offer different converters which may or may not be accurate. The Canadian exchange rate fluctuates throughout the quarter based on Canada’s current economic standing in conjunction with that of the rest of the world. Since the rates fluctuate, the most accurate exchange rate is that posted by the New York Stock exchange, but other sites can be used as general guidelines.