Etsy. eBay. Amazon. KDP. Every platform has its own maze of fees, referral cuts, fulfillment costs and printing charges. We do the math honestly so you can stop guessing what you actually keep.
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Pick your platform. Adjust your numbers. Watch your real profit update in real time.
Rates current as of May 2026, US marketplace. International marketplaces may differ. Verify in your seller dashboard before pricing decisions.
Upload your Etsy, eBay, Amazon or KDP listings. We tell you which ones are quietly bleeding money, and what to reprice them to. The kind of insight a spreadsheet wishes it could give you.
Published 2026 US rates from each platform: Etsy and eBay seller fee schedules, Amazon's 2026 referral and FBA fee updates, and KDP's printing cost and royalty formulas. The exact rate applied is visible in the fee breakdown below the results.
Current version assumes US rates. UK, EU, JP and other marketplaces have different referral rates, printing costs and processing fees. International support is on the roadmap alongside the bulk analyzer.
The FBA fee table uses representative 2026 non-peak rates by size tier. Real fees vary slightly within tiers based on exact weight and dimensions, and the 3.5% fuel surcharge (effective April 17, 2026) is applied automatically. Peak-season fees (Oct 15–Jan 14) are not yet modeled.
Yes. Black & white paperbacks of 24–108 pages incur only the fixed printing cost (no per-page charge). The calculator applies this automatically. Color books pay per-page from page one.
Nothing leaves your browser. The calculator runs entirely on your device. We only store your email if you join the waitlist.
Single-listing math is fast. Bulk CSV analysis, reprice suggestions and multi-platform reconciliation take real infrastructure — and it pays back many times over the moment you find one money-losing listing.