Free calculators for US sellers
Know what you keep before you list.
Estimate marketplace fees, product costs, ads, and shipping in one place. No account, no spreadsheet, no optimistic payout number.
Line-item mathSee where every dollar goes.
Checked 19 Sep 2026Rates linked to official sources.
Private by designYour numbers stay in your browser.
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Profit calculators
Start with a real SKU. Each calculator includes platform fees plus the costs sellers usually forget.
US · 2026 model
Amazon FBA profit
Detect the standard tier, model every per-unit cost, and find break-even ACoS.
Open calculator → US sellersEtsy fee calculator
Compare Offsite Ads outcomes and solve the price needed for your target profit.
Open calculator → US · no StoreeBay profit calculator
Find your minimum offer and Promoted Listings break-even ceiling.
Open calculator → Side-by-side toolCompare all three
Run the same product through Amazon FBA, Etsy, and eBay assumptions.
Compare marketplaces →Price with context
Plain-English seller guides
The result matters more when you understand the assumptions behind it.