Util Tools Free eCommerce Tools Online
Profit margin, markup, Amazon FBA, sales tax, and discount calculators for online sellers.
Profit Margin Calculator
Gross margin, net margin, markup, and a full P&L waterfall.
Open tool →Markup Calculator
Markup from cost and price, plus a markup-vs-margin table.
Open tool →Amazon FBA Calculator
FBA referral, fulfillment, and storage fees with profit verdict.
Open tool →Sales Tax Calculator
Add or remove sales tax for all 50 US states and major countries.
Open tool →Discount Calculator
Sale price, percent off, reverse, and stacked discounts.
Open tool →Free eCommerce calculators for online sellers
Running an online store means living in spreadsheets of margins, markups, and fees. These calculators do that math for you: profit margin and markup (and the crucial difference between them), Amazon FBA fees and net profit per unit, sales tax for US states and major economies, and discount pricing including stacked promotions. Each shows its formula so you can trust and adjust the numbers.
Pricing mistakes are expensive and easy to make. Confusing markup with margin, underestimating marketplace fees, or assuming two discounts simply add up can quietly erase your profit. These tools surface the real figures, including break-even points, so you set prices that actually leave money on the table for you.
Guidance for sellers
Use conservative inputs so a product still works when conditions are less than ideal, and verify current fees and tax rates with official sources. These tools are for general guidance, not financial advice. Pick a calculator above to start.