FBAbase

What it does

Free, privacy-first calculators for Amazon US sellers. Model true profit, fees, ROI, FBA vs. FBM, launch cash, breakeven ads, and slow inventory - with no signup, Amazon connection, upload, or paywall. Your numbers stay in your browser.

100% free FBA profit calculator with real holding costs: seasonal storage, aged-inventory surcharge & cost of capital. Runs in your browser. No signup.

100% FREE FOREVER & Private: Zero server storage means your Amazon supplier costs and profit data never leave your browser. No API, no registration - just instant, secure calculations. Complete per-unit profit for Amazon sellers - margin, ROI, breakeven TACOS, and the inventory holding costs the standard formula leaves out. Records are saved in this browser. 1/1 This page prices one unit sold through FBA. Still deciding whether to use FBA at all? The FBA vs FBM calculator runs both routes side by side, including what the Prime badge does to your volume. Every field starts on a demonstration value, not your product. Replace them with your own figures from Seller Central and your supplier…from fbabase.com

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