Built by Marketplace Operators, for Marketplace Operators
SellerCalculators was founded in 2018 by active multi-channel brand managers who experienced firsthand how hidden fees, unexpected surcharges, and outdated spreadsheets erode profit margins on Amazon FBA, Walmart WFS, and eBay.
Our Mission
Marketplace seller tools have become bloated with paid subscriptions, sign-up walls, and paywalled basic utilities. Our mission is to provide 100% free, real-time, mathematically rigorous calculators that every seller can use instantly without creating an account or handing over API access tokens.
Verified 2026 Rates
We continually audit official fee schedules from Amazon Seller Central, Walmart Seller Center, and eBay to ensure 100% accuracy.
Practitioner Built
Maintained by an active team of e-commerce brand operators managing private label, wholesale, and 1P Vendor Central accounts daily.
Zero Paywalls
No login, no credit card, no free trials — just instant financial calculations directly inside your browser.