Herminox

About

Herminox provides six free Amazon calculators designed for both sellers and buyers. All tools operate directly within your browser without requiring any signup or email submission, and your data never leaves your device. Sellers can calculate FBA profit using 2026 fees and fuel surcharges, determine ACoS and TACoS breakeven points including maximum CPC, and assess inventory recovery by finding how many units must be sold to recoup purchase order costs after fees. Buyers have access to a unit price calculator, a cost per use tool, and a return tracker that accounts for holiday windows and tied up capital. Coaches are able to embed these widgets. This is an independent service and is not affiliated with Amazon. Always verify fees within Seller Central.