Go to the dashboard of the FBA calculator by searching the FBA revenue calculator in your search engine. Then enter the ASIN of the product that you want to check, after that click on Search button. FBA Calculator will show you all the fees that amazon charge for this product like FBA fees, Referral fees, Storage Fees etc. If you want to change the item price then it will calculate the profit for that new price. That’s how you can use the FBA Calculator for the Profit & Loss analysis.