Seller and Business Calculators
These calculators help online sellers and small businesses work out what a sale really earns. Check marketplace fees, price a product with markup and margin, and find how much advertising a product can afford. Every tool is free and runs in your browser.
Calculators in this group
Who these calculators are for
Marketplace sellers who want to know what is left after fees and costs.
Small shop owners who set prices from cost and want a target margin.
Anyone who runs paid ads and needs to know the break-even point.
How these calculators work
Each page explains its formula in plain words, shows a worked example and lists its limits, so you can see exactly how a result is reached. Fee and cost values start as placeholders that you can edit, and the numbers you type stay in your browser.
Tips for accurate results
Start with your own current numbers. Fee rates change and differ by category, country and account, so replace the defaults with the rates on your own statement. Include every cost you pay per order, such as shipping labels, packaging and payment fees, because leaving one out makes profit look better than it is. If you compare two tools, check that they use the same inputs. Results are estimates, so check important figures against your own account data.
How to choose the right calculator
Start with the question you need to answer. If you want to know what a sale on eBay or Etsy will earn, use the matching fee calculator. If you are setting a price from your cost, use the markup and margin tool. If you are running ads, use the break-even ROAS calculator to find the return you need before you spend. Many sellers use all three together: set a price, check the fees, then check how much advertising the margin can afford.
Latest from the blog
How Much Does Etsy Take Per Sale? Etsy Fees Explained
Read article: How Much Does Etsy Take Per Sale? Etsy Fees ExplainedA line-by-line look at Etsy’s listing, transaction, payment processing and Offsite Ads fees, with worked examples on four sales.
What Is Break-Even ROAS? Formula, Examples and How to Use It
Read article: What Is Break-Even ROAS? Formula, Examples and How to Use ItBreak-even ROAS is the return on ad spend at which an order pays for itself. Learn the formula, see worked examples and find your…
Markup vs Margin: What Is the Difference? Formulas and Examples
Read article: Markup vs Margin: What Is the Difference? Formulas and ExamplesMarkup and margin both describe profit, but they divide by different numbers. Here are the formulas, worked examples and a conversion table.
More answers
New to the tools? Read the FAQ page, and see the Disclaimer for the limits of the results. You can also browse all calculators.