Free Amazon Seller Tools
The same math we run on our own Amazon accounts, packaged as fast, free calculators. No signup, no upload to a server — every number stays in your browser. Built by Amazon sellers, for Amazon sellers.
Pick a free tool
- 30-Second PPC Audit — Answer four questions and get an A-F grade, a 0-100 score, and your estimated monthly waste. No CSV upload.
- PPC Waste Calculator — Upload your Amazon Search Term Report to find the exact keywords burning budget, with a copy-paste negative keyword list.
- Break-Even ACoS Calculator — Your true maximum ACoS, a safe target ACoS, and your max CPC bid — from your own numbers, not the generic 25% rule.
- FBA Profit & Margin Calculator — Net profit per unit, profit margin, and ROI after every Amazon fee, before you source a product.
- Agency Cost Calculator — What a percentage-of-ad-spend agency really costs per year versus a flat fee, and the crossover point.
Want this running automatically?
These tools are the manual version. RedHen Labs syncs the real fees Amazon billed you, tracks true profit per product, and queues PPC changes for your approval — a flat monthly fee, never a percentage of ad spend. See flat-fee pricing.