Business tools

Business tools for marketplace sellers

Free calculators and checklists with the formulas shown. They run in your browser, and nothing you type is sent or stored.

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CalculatorsProfit, ACOS, TACoS, PPC break-even and fee calculators.Browse →eCommerce toolsChecklists and assessments for products, stores and readiness.Browse →SEO toolsIn planning. No tools live yet.Browse →

All tools

CalculatorsAmazon FBA Profit CalculatorEstimate what you actually keep on each FBA unit after product cost, shipping, marketplace fees, storage and advertising.Open tool →CalculatorsACOS CalculatorACOS shows how much you spend on ads for each dollar of ad sales. Compare it with your break-even point to see if ads pay for themselves.Open tool →CalculatorsTACOS CalculatorTACoS compares ad spend with total sales, not only ad sales, so you can see how ads fit into the whole business.Open tool →CalculatorsPPC Break-even CalculatorWork out the highest ad cost you can pay per click, or the lowest conversion rate you need, before ads start losing money.Open tool →CalculatorsMarketplace Fee CalculatorEnter the fees your marketplace charges and see what is left after them. This tool does not assume any fee rate for you.Open tool →eCommerce toolsProduct Research ChecklistAnswer ten questions about a product idea. The score shows how ready the idea is and which areas need work before you spend money.Open tool →eCommerce toolsStore Health AssessmentTen questions to see how well your store is being looked after, and where problems are most likely to appear first.Open tool →eCommerce toolseCommerce Business Readiness AuditTwelve questions about the groundwork behind a store. Use the result as a planning list, not as legal or financial advice.Open tool →

How these tools are built

  • Every calculator shows its formulas and assumptions on the page.
  • Fees and rates are values you type in. We do not assume them.
  • Inputs are checked for valid numbers and ranges before results show.
  • Results are estimates, not financial advice or a promise of outcomes.