
Jungle Scout
Helium 10
SellerFee.app
Refunzo
AMZScout
sellerboard
EcomCalcTools
Free 2026 fee calculators for online sellers: Amazon FBA (referral, fulfillment, storage), Etsy, eBay and Shopify. See net profit, margin and break-even price. No sign-up, rates verified daily.

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Website, pricing, platforms and company facts side by side.
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| Website | sellmath.com | reactionic.github.io |
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In their own words, as submitted to SaaSHub.


SellMath is a free toolkit of fee and profit calculators for e-commerce sellers. Instead of rebuilding fee math in a spreadsheet every time, you enter your price and costs and immediately see your real margin after marketplace fees. It covers Amazon FBA profit, eBay/Etsy/Shopify fee calculators,...
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AMZScout extension will help you make a decision about picking a niche based on the actual data, not intuition.
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