About FeeStackBase

Last updated: July 19, 2026

FeeStackBase is an independent, free set of browser calculators for marketplace sellers. Stack the fees on one sale, see payout before cost, then optionally subtract COGS so you know whether a listing is worth photographing. We model fee stacks sellers search for on eBay, Amazon FBA, and Etsy — plus one thin Shopify processing page. That is coverage of common fee math, not a business partnership with those companies.

We are not affiliated with, endorsed by, sponsored by, or partners of eBay, Amazon, Etsy, Shopify, PayPal, or their parent companies. We do not operate Seller Hub, Seller Central, or Etsy payments. Brand names appear because sellers type those queries — not because this is official platform software. Legal detail: terms.

Math runs in your browser (a Web Worker when the page can use one). No account. No email gate. Close the tab and the numbers leave with it. Rate defaults live in dated JSON so we can refresh a table without rewriting the formula code.

Who it's for

Thrift flippers checking whether free shipping still leaves room after final value fee. FBA researchers who want a rough referral + fulfillment cut before opening Fee Preview. Etsy makers who need listing, transaction, and processing on one order — and sometimes a reverse list price for a target profit.

If you already live inside Seller Hub or Seller Central for a live listing or ASIN, use those screens for the billed number. Use this desk to kill bad ideas earlier, teach a helper the fee lines, or keep a dated planning table next to your spreadsheet. Estimates here can disagree with live account rates — always confirm before you list or restock.

Platform fees, not markup coaching

FeeStackBase answers “how much does the platform take?” and “what’s left after cost?” It is not a markup vs margin classroom, not a Shop Workbench, and not a bid coach. Those are different jobs on a different site (MarginBase). Here the product is the fee stack and the payout line — settlement math, not pricing theory.

What you can open today

• eBay — fee calculator, profit, final value fee, how much does eBay take, managed payments / PayPal notes, trading cards, and 2026 rates
• Amazon FBA — FBA calculator, fee / estimator, profit, fulfillment / storage / referral zooms, and USA / UK planning stubs
• Etsy — fees, profit, price (reverse), how much does Etsy take, and 2026
• Shopify — one footnote page: processing estimate

Full index: all calculators. Rate assumptions: methodology. Bug or wrong default: contact.

Contact

Found a stale category percent, a stack line that does not match Hub, or a layout bug? Email contact@feestackbase.com. Include the page URL and the inputs you used. See also privacy and terms.

Estimate only — not your Seller Hub, Seller Central Fee Preview, or Etsy payout screen. Confirm rates in the platform before you list or restock.