Empowering Online Sellers with 100% Private, Accurate Tools
SellerKitHub was founded by e-commerce data analysts and former multi-channel merchants to eliminate financial guesswork for sellers across Amazon FBA, Etsy, eBay, Shopify, and Meesho.
Real-Time Client Computation
All calculations run instantly inside your browser memory. Dragging sliders or changing categories updates profit numbers in under 5 milliseconds.
100% Private & Zero Uploads
Your proprietary product sourcing costs, margins, and photos never leave your device. We store zero financial numbers on external databases.
Free & Accessible
No mandatory signups, credit cards, or paywalled features. Designed for independent handmade artisans, FBA brand owners, and D2C startups.
Our Data Verification & Calculation Methodology
E-commerce fee schedules undergo constant revisions. Amazon updates referral tiers and storage rates annually, Etsy adjusts transaction cuts, and carriers raise dimensional postage fees every peak season.
Our editorial team audits official documentation—including the Amazon Seller Central Fee Schedule (2026), Etsy Seller Handbook Guidelines, eBay Seller Center Fee Structures, and Shopify Payment Gateway Standards—on a monthly basis to update all calculation algorithms in our tool engines.
We extract fee algorithms directly from official developer documentation and fee rate tables published by Amazon, Etsy, and eBay.
Our formulas undergo verification against actual Amazon settlement reports and 3PL invoices to ensure real-world mathematical accuracy.