Margin Seller for Amazon & Walmart

Estimate profit, ROI, break-even, and max buy price from Amazon and Walmart product pages. Not affiliated with Amazon or Walmart.

Margin Seller: Amazon™ & Walmart™ Profit & Margin Calculator Make confident buying decisions before committing cash to inventory. Margin Seller turns Amazon.com™ and Walmart.com™ product pages into an instant profit checker and margin calculator—helping marketplace sellers analyze net profit, ROI, and break-even pricing without risky background scraping. Open any supported Amazon or Walmart product page, click the extension, and immediately analyze the listing details visible in your active tab. Combine real-time marketplace data with your supplier cost and operating assumptions to calculate your exact bottom line. KEY FEATURES • Real-Time Profit Checker: Estimate net profit per unit, net margin, and ROI instantly for both Amazon FBA/FBM and Walmart WFS listings. • Risk & Pricing Guardrails: Calculate your break-even price, maximum buy price, and get clear Buy, Review, or Avoid recommendations. • Custom Operating Assumptions: Factor in referral fees, fulfillment (FBA / WFS), advertising, shipping, discounts, and return rates. • Reverse Sourcing: Input a target ROI to reverse-calculate your maximum supplier purchase price. • PPC Campaign Modeling: Model profitability across ACOS and TACOS campaign scenarios. • Local Research & CSV Export: Save local research history and export clean CSV reports for your catalog audit. • Browser-Assisted Batch Research (Pro): Upload a supplier CSV containing cost plus an ASIN or Walmart ID. Margin Seller generates safe product links and queues rows for manual, visible-page reading. SAFE & COMPLIANT Margin Seller reads only the details visible in your active browser tab and never crawls marketplace pages in the background, keeping your seller accounts safe.