About SellerKit
SellerKit is a free resource built for Amazon sellers who want practical tools and straight answers — not vague advice, gated content, or sales pitches disguised as education.
What We Offer
27 Free Calculators & Tools
FBA profit, break-even ACOS, PPC budgets, A/B testing, inventory reorder, referral fee lookup, listing optimization, and more. No signup required.
In-Depth Guides
Step-by-step guides on profit calculation, PPC optimization, product research, inventory management, and launching products on Amazon.
Software Comparisons
Honest, side-by-side comparisons of popular seller tools — Helium 10 vs Jungle Scout, PPC tools, inventory management, and repricers.
Reference Resources
PPC glossary, fee checklists, tool directories, and other references you can bookmark and come back to whenever you need them.
Why We Built This
Too many Amazon seller resources are either trying to sell you an overpriced course or stuffed with generic SEO filler content that wastes your time. We wanted something different — tools you can open and use in 30 seconds, and content that gives you the actual answer instead of burying it under 2,000 words of fluff.
Every calculator uses the same formulas experienced sellers apply to their own businesses. Every guide includes worked examples with real numbers. Every comparison includes pricing tables, feature matrices, and an honest verdict.
Our Principles
- Free first. Every tool works instantly with no account, no credit card, and no trial period that auto-charges you.
- Accuracy matters. We research fees, formulas, and tool features carefully and update content when things change.
- Respect your time. No pop-ups, no autoplay videos, no "subscribe to read more" gates. You get the full content immediately.
- Transparent monetization. We clearly disclose affiliate links and never let commissions influence our rankings or verdicts.
How We Make Money
Some of our comparison and recommendation pages contain affiliate links. When you click through and subscribe to a tool, we may earn a commission at no extra cost to you. This is how we keep the calculators free and the site running. We always disclose when affiliate links are present, and our verdicts are based on research and testing — not commission rates. Read our full affiliate disclosure.
Get in Touch
Have a question, found a bug in one of our calculators, or want to suggest a new tool? Contact us. We read every message and use your feedback to decide what to build next.