How much will I pay in merchant fees for taking credit cards?

When you sign up for a merchant account, one thing you'll see is a list of fees that are charged.  These all seem small, but can add up depending on the number and size of your transactions per month. 

Try this online calculator to estimate fees based on your projected sales.  You can compare merchant account providers side-by-side and get the one whose charges should be lowest for your particular situation.