About SellerSums

SellerSums builds free calculators for marketplace sellers. The first: an Amazon fee calculator covering the United States, Canada, the United Kingdom and Australia.

Why another fee calculator?

Most free calculators use a single flat referral percentage and ask you to type in your own FBA fee. That defeats the point. SellerSums models Amazon's actual fee structure — category-specific referral rates with price bands and minimums, FBA size tiers computed from your dimensions and weight, seasonal storage rates, Low-Price FBA and current surcharges — for each marketplace separately.

How the fee data is maintained

Every marketplace's rates live in a versioned data file with an effective date, transcribed from Amazon's published fee schedules and re-checked whenever Amazon announces changes. The effective date is shown on every calculator, so you always know how fresh the numbers are. Estimates are for guidance — always confirm final fees for a specific product in Seller Central.

Contact

Spotted an outdated fee or have a calculator request? We'd genuinely like to know — reach out via the blog at blog.sellersums.com.