There are just about has many currencies in the world as there are countries, and a currency exchange rate calculator can be a good tool to use and have for someone who has to exchange money on a regular basis. The Bank of Canada currency converter is on their website and is obviously the best resource on the web about anything concerning the canadian currency. You can also find a universal currency converter to compare various currencies with one another, and that is always useful if you travel across many countries with all sorts of currencies. Currency exchange rates vary on a daily basis and these variations can amount to a lot of money for those juggling huge amounts. Currency trading is a big business for banks who always take a cut on the official rate, so we can just imagine how much money they make in a day, if not in a year. New Zealand currency is part of the international trade. So is the Hong Kong currency which has China to worry about financially.