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Instant FBA fees, profit, margin & ROI on every Amazon product page. Accurate, lightweight, free. No account, no data collection. See your real FBA profit before you source — right on the product page. Verimargin overlays every Amazon product page with the numbers that decide a sourcing call: referral fee, FBA fulfillment fee, monthly storage fee, net profit, margin, and ROI. Enter your cost once — it's remembered per product. Built for accuracy. Fee math verified against Amazon's own FBA Revenue Calculator 2026 US fee schedule (effective January 15, 2026; re-verified each release), including Amazon's marginal "portion of price" referral brackets that most calculators get wrong (Electronics Accessories, Jewelry, Furniture, Watches, Fine Art, Appliances) Models Amazon's 3.5% fuel & logistics surcharge on fulfillment fees (effective April 17, 2026) as its own line item — just like your settlement report — so your fulfillment cost isn't understated Honest about uncertainty: when a page doesn't expose package dimensions or a fee category can't be matched, Verimargin tells you instead of guessing silently Fast and focused. Works on standard, variation, bundle, out-of-stock, and Subscribe & Save pages Size-tier classification (Standard / Bulky / Extra-Large) from page data Per-product category override + default category setting Quick-links to Keepa, CamelCamelCamel, and Seller Central for deeper research Light/dark/auto theme Private by design. 100% client-side — no servers, no account, no analytics, no tracking Your costs (COGS) are stored only in your browser Reads only the Amazon product page you're viewing Free. The core calculator is free, forever. (Pro features may come later — the free tier stays.) Made for FBA sellers, resellers, and arbitrage sourcing on amazon.com.