Because i’m often on the roll, I find myself checking for exchange rates almost every day. So I have been using XE for half my life now. Their website is http://www.xe.com and on the same front page you can select the base currency and the exchange currency.
I still use these guys because it’s free, and they always had the most reliable rate. And btw a little trick for you, when you converted a rate, you can quickly make another calculation by changing the amount in the address bar (I highlighted in red where in the screenshot).