Free calculators for US sellers

Free marketplace fee and profit calculators

Estimate marketplace fees, product costs, ads, and shipping in one place. No account, no spreadsheet, no optimistic payout number.

Calculate Amazon FBA profit Check Etsy fees
Line-item mathSee where every dollar goes.
Reviewed 4 Oct 2026Sources and assumptions are plainly dated.
Private by designYour numbers stay in your browser.

Choose a marketplace

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 sellers

Etsy fee calculator

Compare Offsite Ads outcomes and solve the price needed for your target profit.

Open calculator → US · no Store

eBay profit calculator

Find your minimum offer and Promoted Listings break-even ceiling.

Open calculator → Local or shipped

Facebook Marketplace fees

Compare local pickup with an editable shipped-checkout fee and every real seller cost.

Open calculator → Side-by-side tool

Compare 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.

Method

How we calculate fees

Sources, rounding, exclusions, and how to audit a result.

 Pricing

Why cheap items lose margin

Fixed fees and fulfillment costs punish low selling prices.

 Interactive comparison

Amazon vs Etsy vs eBay

See the math, then understand what unit profit cannot tell you.

Need the full library? Browse all marketplace seller guides.

Calculate selling fees before you list

Marketplace revenue is not the same as profit. Amazon, Etsy, eBay, and Facebook Marketplace use different fee bases and sale flows, while fulfillment, postage, advertising, packaging, returns, and product cost come out separately. FreeFindy brings those deductions into one itemized estimate so you can test a product before committing inventory or accepting an offer.

Each calculator is designed for a specific decision: estimate Amazon FBA profit and break-even ACoS, calculate Etsy fees with or without Offsite Ads, find an eBay minimum offer price, or compare Facebook Marketplace local and shipped profit. For a three-channel decision, the marketplace comparison calculator runs the same product through Amazon, Etsy, and eBay.

Rates are dated and linked to primary marketplace sources. These tools are independent planning estimates, not payout quotes, and they work without an account or uploading seller data.