Played around with a free download this morning.
Amazon Fee & Profit Calculator for Bulk Listings
This Excel file helps you calculate Amazon Marketplace fees or selling prices, aiming to guide you to price your items so you'll make the most money.
It's an interesting project, fun to play 'what if' games. Buy a used book for 50 cents, sell it for $19.99, and count up all the money you made!
Not so fast.
What would really make this tool valuable would be if it pulled actual Amazon Marketplace listings from a database and showed you how likely we are to make money, how much competition that used book has, and how frequently it sells.
But it's still worth downloading and having a simple spreadsheet to 'plug and play' pricing scenarios.