1 . How do I use the Currency Converter? Use the Currency Converter to calculate exchange rates for any day back to January, 1990. Add percentages to get more realistic rates like what you’re charged by banks or credit card companies. Type currency names, 3-letter ISO currency symbols, or country names to select your currency. Convert world currencies, precious metals, or obsolete currencies, which are marked with an asterisk (*). Type values in either side of the converter, depending on if you have money to exchange or if you want money to purchase items costing a certain amount. Choose a percentage from the Interbank rate list to better approximate the tourist exchange rates actually charged by your financial institution. How do I choose the Interbank rate that applies to me? The "Interbank" rate is the official rate. I’m in Europe and want to buy something that costs 500 euros. How much will it cost me in US doll...