With the FXConvertor of Oanda you will be able to see how much a specific amount of one currency is worth in another currency. Also try the other tools, like the FXCheatSheet, which will help you to produce tables with exchange rates of 2 different currencies for different amounts of money. You can use this as a simple cheatsheet during your travels. The FXCrossRate helps you to make crosstables of foreign currencies of your choice, so you will be able to find the exchange rates within seconds.