Free Reseller Fee Calculator Widget

Put a small fee and profit calculator on your blog, website or link page. It covers Whatnot, eBay, Poshmark, Mercari, Depop and Etsy, and it is free.

Fee rules as of Oct 2026 · checked October 4, 2026 · sources

What it does

Your readers pick a platform and enter a sale price, the shipping the buyer paid and what they paid for the item. The widget shows the fees, the payout and the profit as they type. A second version runs the same sale on every platform side by side, so a reader can see where they keep the most.

The numbers come from the same fee rules as the calculators on this site. When a platform changes its fees, we update one file and every embedded copy picks up the change. You never have to touch your page.

Live preview

Fee calculator, light theme
Platform comparison, dark theme

Copy the code

Paste one of these into an HTML or “custom code” block. On WordPress, use the Custom HTML block. Each snippet includes a plain text link under the widget; please keep it.

Single-platform calculator

Fee calculator, light theme

<iframe src="https://flipprofithq.com/embed/fees/" title="Fee calculator by Flip Profit HQ" width="100%" height="500" style="max-width:420px;border:0;border-radius:12px" loading="lazy" sandbox="allow-scripts allow-popups allow-popups-to-escape-sandbox"></iframe>
<p style="font-size:13px;margin:4px 0 0"><a href="https://flipprofithq.com/">Free reseller fee calculators</a> by Flip Profit HQ</p>

Fee calculator, dark theme

<iframe src="https://flipprofithq.com/embed/fees/?theme=dark" title="Fee calculator by Flip Profit HQ" width="100%" height="500" style="max-width:420px;border:0;border-radius:12px" loading="lazy" sandbox="allow-scripts allow-popups allow-popups-to-escape-sandbox"></iframe>
<p style="font-size:13px;margin:4px 0 0"><a href="https://flipprofithq.com/">Free reseller fee calculators</a> by Flip Profit HQ</p>

All-platform comparison

Platform comparison, light theme

<iframe src="https://flipprofithq.com/embed/compare/" title="Platform comparison by Flip Profit HQ" width="100%" height="570" style="max-width:420px;border:0;border-radius:12px" loading="lazy" sandbox="allow-scripts allow-popups allow-popups-to-escape-sandbox"></iframe>
<p style="font-size:13px;margin:4px 0 0"><a href="https://flipprofithq.com/">Free reseller fee calculators</a> by Flip Profit HQ</p>

Platform comparison, dark theme

<iframe src="https://flipprofithq.com/embed/compare/?theme=dark" title="Platform comparison by Flip Profit HQ" width="100%" height="570" style="max-width:420px;border:0;border-radius:12px" loading="lazy" sandbox="allow-scripts allow-popups allow-popups-to-escape-sandbox"></iframe>
<p style="font-size:13px;margin:4px 0 0"><a href="https://flipprofithq.com/">Free reseller fee calculators</a> by Flip Profit HQ</p>

Options

  • Dark theme: add ?theme=dark to the address, as in the dark snippets. ?theme=auto follows the reader’s device setting.
  • Start on a platform: add ?platform=ebay to the fee calculator (or whatnot, poshmark, mercari, depop, etsy). Combine options with &, for example ?platform=poshmark&theme=dark.
  • Size: the widget fits widths from about 300 to 460 pixels. Change height if your layout needs more room.

Where it works

  • Blogs and websites that allow iframes: WordPress, Squarespace, Wix, Ghost, Webflow and most others.
  • Link-in-bio pages for Whatnot or Poshmark sellers, if the service has an embed or custom HTML block. If it only allows links, link to flipprofithq.com/embed/fees/ instead.
  • Facebook group guides and shared docs usually can’t hold an iframe. Post the link to this page or to one of the calculators instead.

What it does not do

The widget uses standard seller rates: no ads, boosts, store subscriptions or promotions. Whatnot uses the Standard tier in the Other category, and eBay uses the rate for most categories. It assumes your shipping label costs what the buyer paid for shipping. For tiers, categories and sales tax, readers can use the full calculators on this site. It loads only our own small script and style files. It sets no cookies, stores nothing and doesn’t track readers.

Terms of use

  • Free. You can embed it on any site or page, personal or commercial. No sign-up.
  • Keep the credit link. Don’t remove or hide the “Free reseller calculators by Flip Profit HQ” line or the link under the widget, and don’t change the widget to look like your own tool.
  • Estimates only. Results are estimates based on each platform’s published fees on the date shown. They are not tax, legal or financial advice. Readers should confirm fees on the platform before pricing.
  • No warranty. The widget is provided as is. We may change, update or stop it at any time, and we aren’t liable for decisions made with it.
  • Not affiliated. Flip Profit HQ is independent and is not affiliated with, endorsed by or connected to Whatnot, eBay, Poshmark, Mercari, Depop or Etsy.

Questions or a broken embed? Email flipprofithq@gmail.com. See also our site terms.