Quick, no-login tools for Amazon FBA sellers. Estimate fees, model profit and ROI, and gauge sales velocity from BSR, then bring your whole supplier list into Gridwinner to analyze every product at once.
Estimate Amazon referral fees, FBA fulfillment fees, and net profit from price, weight, and dimensions.
Open toolCalculate ROI, profit margin, and the maximum buy cost to hit your target return before you source.
Open toolConvert an Amazon Best Sellers Rank into an estimated monthly sales volume by category.
Open toolConvert Keepa minute-epoch timestamps into readable dates (and back) when working with raw Keepa CSV exports.
Open toolThese calculators give you fast, single-product answers. But real wholesale and arbitrage sourcing means evaluating hundreds or thousands of products from a supplier list. Gridwinner parses your CSV locally in the browser and runs the same fee, ROI, and velocity math across every row in one pass. Explore the full feature set to see how it works.
Gridwinner analyzes your entire supplier list in seconds: FBA fees, ROI, and winners, all at once.
Analyze your whole supplier list