About Seller Toolkit

Seller Toolkit is a free collection of calculators and helpers built for Amazon sellers — people who need to know their FBA fee, their real profit per unit, their ACOS, and their reorder point without opening a spreadsheet. Every tool runs in your browser. No account, no upload, no data leaving your machine.

Our Mission

Amazon's own calculators are fine, but they're scattered and don't talk to each other. We built a single place where the fee math, the profit math, the ad math, and the inventory math all sit together and share the same assumptions.

What We Offer

51 free tools across 8 categories: profit & pricing, listing optimization, ads & PPC, inventory & logistics, product research, account health, cross-border, and efficiency helpers.