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For US sellers · rates checked 2026-11-11. Official fee sources are linked at the end of this page.

How We Calculate Fees

Every number on OpenFeeCalculator is an estimate built from a documented official source, a check date, and a written rule for bases, tax and rounding. This page is that rulebook. It exists so you can see how a payout was produced, what we refused to invent, and where the estimate stops. The site is operated by Alex Builds Studio. It is not affiliated with eBay, Etsy, Poshmark, Mercari, PayPal, Depop or Whatnot. If a result disagrees with your invoice or statement, the invoice wins.

By Alex, Alex Builds Studio · Updated 2026-11-11

Every number on OpenFeeCalculator is an estimate built from a documented official source, a check date, and a written rule for bases, tax and rounding. This page is that rulebook. It exists so you can see how a payout was produced, what we refused to invent, and where the estimate stops. The site is operated by Alex Builds Studio. It is not affiliated with eBay, Etsy, Poshmark, Mercari, PayPal, Depop or Whatnot. If a result disagrees with your invoice or statement, the invoice wins.

Sources and check dates

Fee schedules live in JSON files under a dated directory in the source, each with a sourceUrl, a source title, a checkedAt date, and notes. The primary US sources we fetched on 11 November 2026 (Asia/Shanghai) are listed on the calculator pages and in the changelog: eBay Seller Center and the managed-payments fee page; Etsy Help articles on selling fees, payment processing and Offsite Ads; Poshmark's seller guide; Mercari Help on fees; the US PayPal merchant fee page; Depop's seller-fees article; and Whatnot's 'How Fees Work' page. When a host returned 403 to an automated request, we say so on the relevant page and used a retrieved official article rather than a third-party blog. We do not scrape a rate from a YouTube transcript or an undated screenshot.

A check date is the day we read the official page, not the day a company first published a rate. If the official page also prints an effective date or a 'last updated' stamp, we quote that separately in the changelog. Re-checks will move checkedAt and add a changelog line. Until a re-check happens, treat 11 November 2026 as the vintage of the first-release tables.

Bases, tax treatment, and rounding

Each platform has its own official base, and we refuse to normalize them into one fake 'take rate.' eBay's US final value fee uses the total amount of the sale, including item price, shipping collected and sales tax, then remits the tax. Poshmark's 20% or $2.95 is modeled on the listing price. Mercari's 10% seller fee uses item price plus buyer-paid shipping, and the 3.6% Buyer Protection fee is treated as buyer-paid. Etsy's 6.5% transaction fee is applied to item, shipping and gift wrap; for US tax we assume that transaction fee excludes tax unless an official page later says otherwise, while Etsy Payments processing of 3% + $0.25 includes tax, following the Help articles we read. PayPal, Depop and Whatnot follow the product-specific official bases described on their calculators, including Whatnot commission on the item only and processing on the order total.

money values are rounded half-up to the nearest cent after each fee line is computed
percentages in JSON are stored as decimals (0.136, not 13.6) and applied to the official base
payout = money in − remitted tax − fees that the official page assigns to the seller
profit = payout − cost of goods − postage the seller actually pays

Half-up to the cent means 0.005 becomes 0.01. Official eBay worked examples (Marco, Val, Chad, Jodie) are encoded as unit tests so a later edit to a rate cannot silently break a published official scenario. Typical mid-price and breakpoint fixtures, such as Poshmark at $14.99 versus $15.00, are tested the same way. If an official page shows a worked example that our engine cannot reproduce, the test fails and the page is not 'close enough.'

What we will not do

We will not invent unpublished volume tiers, unpublished category rates, or a fee that an official page does not state. Whatnot's public page as of September 2026 describes standard commission starting at 8%; a rumored coins rate that is not on that page is not in our files. We will not display fake review counts, user totals, or 'as seen in' badges. We will not auto-detect locale in a way that sends a US visitor to the Chinese site without asking; English lives at the root, Chinese at /zh. We will not claim affiliation with a marketplace in order to rank for its name. Trademarked names appear because they are the subject of the calculator, with a clear independent-tool disclaimer.

Promoted Listings, Etsy Offsite Ads and Depop Boost are optional and are applied only when you enter them. The eBay ad rate is not folded back into the final value fee base, because the official 'other applicable fees' phrase is not itemized for ads on the page we fetched. The comparison grid includes every platform we cover, and each column still uses that platform's official base rather than one made-up take rate. Analytics scripts (GA4 and Microsoft Clarity) load only when their environment variables are set; calculations themselves run in your browser and are not uploaded as sale records to our server.

Limits of the estimate

The calculator does not model every promotional credit, holds, chargebacks, currency conversion outside the official international add-ons we documented, off-platform payment plans, or a custom contracted rate. It does not predict sell-through. It is not tax, legal or financial advice. Opening every tool for free does not change these calculation rules. The honest use of this site is to put official rates next to a real sale, then to compare that estimate with your statement.

How to use this calculator

  1. Open the source link on the calculator you used. Every rate page lists the official URL and the check date.
  2. Confirm the base, not just the percentage. Shipping, tax and listing price are not interchangeable across platforms.
  3. Compare the estimate with your statement. If they disagree, the statement is authoritative. Send us the official URL if the source may have changed.
  4. Read the changelog after a re-check. New vintages will be dated; we will not silently overwrite history.

Frequently asked questions

Where do the rates come from?

Official platform pages fetched on 11 November 2026, stored in JSON with a source URL and a checkedAt date. Individual calculators and the changelog name each source.

How do you handle sales tax?

According to each official page. eBay includes tax in the final value fee base and remits it. Etsy's 6.5% transaction fee is assumed to exclude US tax unless an official page says otherwise. Other platforms follow their own published rules.

How do you round?

Each fee line is rounded half-up to the nearest cent.

Why is a rate I heard about missing?

If it was not on the official page we fetched, we do not invent it. Unpublished Whatnot category tiers are the usual example.

Do you store the sales I type in?

Phase 1 calculations run in the browser. We do not upload those figures as a sales ledger. Analytics load only if you, as the operator, set the environment variables.

Are you affiliated with the marketplaces you name?

No. OpenFeeCalculator is an independent tool from Alex Builds Studio.

Is this advice?

No. It is an estimate. See the disclaimer.

When will rates be updated?

When we re-fetch an official page or when a reader sends a source that shows a change. The new check date will appear in JSON and in the changelog.

Sources and updates