Fee calculators for Amazon and eBay sellers

Free tools that answer one question each, checked against Amazon's and eBay's own fee pages.

• FBA fee calculator: 2026 US fulfillment and referral fees, holiday peak rates, profit per unit.
• eBay fee calculator: 2026 US final value fees by category, with or without a Store, sales tax and Promoted Listings.
• ACoS calculator: ACoS, ROAS, TACoS, break-even ACoS and the most you can pay per click.