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Seller guides

Plain-English guides to fees, pricing and profit for Etsy, eBay, Shopify and Amazon sellers. Every guide links to a free calculator so you can run your own numbers.

Etsy vs eBay vs Shopify vs Amazon Fees (2026)

Side-by-side seller fees on a $35 order, the hidden monthly costs, and which platform keeps the most money in your pocket.

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Profit Margin vs Markup: Formulas, Chart & Examples

The difference between margin and markup, how to convert one into the other, and a ready-made conversion chart.

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How to Price a Product to Sell Online (Formula + Examples)

A step-by-step pricing formula that covers product cost, marketplace fees, shipping and your target profit margin.

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