Simply use the regular search box and search for starting currency in desired currency. For example, to find out how much the Canadian dollar is worth in US dollars today, I'd type in:
canadian dollar in us dollarThe calculator graphic appears at the top of the screen along with my answer in bold type. This is because currency conversion is part of Google's hidden calculator.
Remember, you don't need to capitalize things in Google searches.
Variations
Google is amazingly forgiving with the way you phrase things. You can type "one Canadian dollar in American dollars," "CAN in USD," or "Canadian money in US money" and get exactly the same results.
You can specify small change for most currencies, such as US cents. You can also ask for conversions of more or less than one unit, such as "fifty US cents in Yen" or ".5 USD in British pounds."

