I just found this PayPal fee calculator: PayPal Fee Calculator by Ryan Olbe (Last Updated: June 04, 2011)
You can enter an amount you are going to charge, and it calculates the fee. It also does a reverse calculation, so you can figure out how much you would have to charge to get your desired amount after fees.
This sure make thing easy.
I wonder how many sites are doing over > $100,000.00 USD Monthly Sales Volume using paypal?
Anyone that is a member here