Selling Online Calculators

About selling online calculations

Selling online is an exercise in subtraction. The buyer pays one number, and between that and your bank account sit marketplace commission, payment processing, advertising, shipping, materials, returns and tax. Sellers who only track revenue routinely discover that a busy month produced very little.

These calculators make each subtraction visible. Fee tools break an order down layer by layer so you can see what a platform actually takes. Margin tools keep the distinction between markup and margin explicit, because confusing them is the single most common and most expensive pricing error in retail, a 50% markup is a 33% margin, and treating them as the same underprices everything.

Marketplace fees change without notice, so every rate in these calculators is an editable field with a visible verification date rather than a number baked into the formula. If a platform moves a fee before we update the page, you can correct it yourself and still get the right answer.

Which one do you need?