xbbTools
About xbbTools
Last updated: June 7, 2026
Practical Tools for Amazon Sellers
xbbTools is a free collection of calculators and converters for Amazon sellers who need clearer numbers before listing, sourcing, or changing packaging. The site focuses on everyday product research tasks—profit checks, FBA packaging comparisons, and metric–imperial unit conversion—not on replacing Seller Central.
Whether you evaluate a supplier quote, compare carton sizes, or translate factory dimensions into US-friendly units, xbbTools is designed to keep the workflow practical and readable.
The current scope centers on Amazon US fulfillment modeling, but the conversion tools are useful whenever you need consistent metric and imperial figures in one view.
What xbbTools Currently Offers
Four tools are available today:
- Amazon Profit Calculator
Estimate referral fees, FBA fees, costs, margin, and ROI from seller-style inputs.
- Amazon FBA Packaging Optimizer
Compare package dimensions, size tier effects, dimensional weight, shipping weight, and modeled fee differences.
- Length Converter
Convert mm, cm, m, in, ft, and yd for packaging dimensions and supplier drawings.
- Weight Converter
Convert mg, g, kg, oz, and lb for product and package weight before entering other tools.
How We Approach Accuracy and Transparency
Calculator outputs are estimates for planning and comparison. They rely on versioned rule packages, documented rounding steps, and field definitions described in Calculation Methodology.
Rule status is shown dynamically in the site footer on tool pages so you can see which release and revision the site is using. Important decisions should always be checked against Amazon official tools, inbound measurements, and your account data—not against a single modeled result.
When a supplier spreadsheet, factory label, and Seller Central field disagree, xbbTools helps you translate units and compare scenarios; it does not decide which source is authoritative.
Independent From Amazon
xbbTools is operated independently and is not affiliated with, endorsed by, or sponsored by Amazon. Amazon, Seller Central, and FBA are trademarks of their respective owners.
The tools help you prepare and compare numbers; they do not submit listings, change account settings, or guarantee fee outcomes.
How the Tools Are Maintained
Fee rules, size tiers, and calculation steps can change as Amazon updates programs and as xbbTools publishes new rule package versions. When definitions change, Methodology and rule status references are updated to match.
Additional seller tools may be added over time, but xbbTools does not promise specific launch dates or platforms beyond what appears on the site today.
If you notice a mismatch between a tool result and official Amazon data, use Contact to report reproducible details so the site documentation and rule handling can be reviewed.
Contact and Policies
For questions, feedback, or privacy requests: