Amazon seller fee tools
Free calculators built on one tested set of Amazon's 2026 US fee data. Each one runs in your browser and shows where its numbers come from.
FBA profit calculator
Every fee for one product, with its source, margin, ROI, break-even price and fee cliffs.
Bulk FBA calculator
Paste or upload a supplier list and get fees, profit and ROI for every row. Download the results.
FBA vs FBM calculator
Compare Amazon fulfillment with shipping it yourself, and see the shipping cost where they break even.
Packaging and box size calculator
Test box sizes around your product and find the one with the lowest fulfillment and storage fees.
Q4 peak fee planner
What the holiday peak fulfillment fees and Q4 storage will add, period by period.
Size tier and dimensional weight
The 2026 size tier, dimensional weight and the weight Amazon bills on.
Referral fee lookup
Exact referral fee for any category and price, with threshold warnings.
Low-inventory-level fee calculator
Your days of supply, whether the fee applies, and how many units to add.
Storage and aged inventory calculator
Monthly storage, aged-inventory surcharges, and whether to keep or remove old stock.
Returns processing fee calculator
What returns cost per unit sold, and whether you are over your category threshold.
Put the calculator on your site
Run a blog, a prep center or a sourcing service? You can embed the FBA calculator for free. It updates automatically whenever Amazon changes its fees.