Like the kind in an airport? Those are usually trouble. On average they try to make about 15 percent on the exchange. A bank or credit union typically tries to make about 7 percent on the exchange. Last year I wanted t take 1,000 euros to Europe on vacation and figured it would cost me about $1,137 USD. Using a bank for this transaction, the actual amount was $1,215 as I recall. So, that was like 6.9%. However, when I was at Cleveland Hopkins International airport their currency exchange desk would have charged me $1,290 when I enquired a short time later. I will try to find this out for you at today's rates ... how soon do you need to know?