Fee, pricing, and profit tools for sellers

SellerMaths

Calculate marketplace fees, payment costs, break-even price, and target profit in one place. SellerMaths helps sellers and creators check the numbers before they change prices, choose a platform, or build a spreadsheet.

Last updated: 2026-03-25

Start with the page that matches your question

Most visitors do not need the full site map. They need the right tool fast.

Calculate fees

Open a live calculator when you need a fast number for one order, one payout, or one pricing threshold.

Open calculators

Set the right price

Read a guide when the real problem is pricing logic, margin leakage, shipping treatment, or cost structure.

Open guides

Compare platforms

Use compare pages when the decision is between two marketplaces or payment stacks in the same scenario.

Open compare pages

Use a template

Open a template when you want to rebuild the logic in Google Sheets or Excel and repeat it every week.

Open templates

1. What you can do on SellerMaths

SellerMaths is built for practical seller decisions. Use it to estimate fees, work backward from a target profit, check break-even price, compare platforms, and organize your pricing logic.

  • Estimate what a marketplace or payment processor takes.
  • Check how much you actually keep after fees.
  • Find the minimum price that protects your margin.
  • Compare two selling options side by side.
  • Turn one-off pricing logic into a repeatable sheet.

2. Choose the right tool type

Different problems need different page types. Start with the one that matches your decision.

  • Calculators: for a fast number based on your inputs.
  • Guides: for pricing rules, margin logic, and cost structure.
  • Compare pages: for head-to-head platform decisions.
  • Templates: for rebuilding the logic in Sheets or Excel.

3. Pages people usually open first

The most used SellerMaths pages help with Etsy pricing, eBay UK fees, Stripe and PayPal processing costs, Gumroad payouts, and fee-aware pricing decisions.

  • Etsy pricing after fees.
  • Etsy break-even and reverse pricing.
  • eBay UK business seller fees.
  • Stripe international card fees.
  • PayPal merchant fees.
  • Gumroad payout math.

4. Best way to use the site

Start with the narrowest tool that matches your question. Check the assumptions, test your numbers, and then move to a guide, compare page, or template if the decision becomes bigger than one order or one product.

  • Use one live calculator first for the exact scenario in front of you.
  • Move to a guide when the pricing rule matters more than the first result.
  • Move to a compare page when the real choice is between two platforms or payment stacks.
  • Move to a template when you need the same logic to repeat every week or every month.

5. How SellerMaths stays transparent

SellerMaths includes methodology, sources, and trust pages so you can see where the numbers come from and where a page's limits begin.

  • Open Methodology to understand how public fee rules become page logic.
  • Open Sources to verify the official documents behind a page.
  • Use the trust pages when you need privacy details, contact information, or the boundary between estimate and advice.

Popular calculators and pages

Open the pages people usually need first for marketplace fees, payment costs, payout checks, and pricing decisions.

Methodology, sources, and trust pages

Use these pages when you want to check assumptions, verify sources, or understand what SellerMaths does and does not claim to do.

Source note

Fee and pricing tools only help when the assumptions are visible. SellerMaths links every page back to public fee documents, official pricing pages, or business guidance sources so you can see where the numbers come from.

Assumptions

  • This homepage links only to live SellerMaths pages that already exist in the current working set.
  • Each linked page keeps its own scope, currency, country, seller type, and fee assumptions, so the homepage should not be treated as a universal rule page.
  • SellerMaths uses public documentation and seller-entered inputs rather than private account integrations or official tax filings.
  • The site is designed to improve fee visibility, pricing discipline, and recordkeeping clarity, not to replace legal, tax, accounting, or financial advice.

FAQ

What is SellerMaths for?

SellerMaths helps sellers and creators estimate fees, check payout math, set price floors, compare platforms, and structure repeatable pricing logic without hunting through platform docs one by one.

Is SellerMaths an official marketplace or processor tool?

No. SellerMaths is an independent utility site built from public platform documentation and official business guidance. Each page should still be checked against its own source note and assumptions.

Should I start with a calculator or a guide?

Start with a calculator when you need a fast estimate for one scoped scenario. Start with a guide when the problem is really about pricing logic, cost structure, or profit discipline.

Do compare pages replace the individual calculators?

No. Compare pages answer a narrower head-to-head question. Individual calculators are still the better tool when you need to inspect one platform's fee stack or rerun a scenario with your own inputs.

Are the spreadsheet pages downloadable files?

Not by default. The template pages explain a sheet structure and field logic you can rebuild in your own spreadsheet rather than pretending every page is a direct file download.

Why do the trust pages matter on a calculator site?

Because fee tools are only useful when the assumptions, sources, disclosures, and limitations are visible. The trust pages explain how SellerMaths works and where a page's logic came from.

Sources

Browse calculatorsRead pricing guidesSee sources