Amazon FBA unit economics
Amazon FBA Profit and Break-Even Guide
Amazon FBA profit depends on more than the headline referral fee. A decision-ready model separates product cost, referral fees, FBA fulfillment, storage, inbound placement, advertising, returns, and other per-unit allocations.
Use the exact category referral rate and current size or weight tier from Seller Central.
Allocate storage and inbound placement per sellable unit instead of hiding them in product cost.
Compare break-even price with the competitive market price before ordering inventory.
Separate percentage fees from unit costs
Referral fees usually scale with revenue, while FBA fulfillment, storage allocation, inbound placement, packaging, and most product costs behave like fixed unit costs. Keeping the groups separate makes break-even and target-price calculations explainable.
- Revenue = item price + shipping charged to the buyer.
- Referral fee = the greater of revenue × category rate or the applicable minimum.
- Net profit = revenue - referral fee - all fulfillment, product, marketing, and return costs.
Stress-test inventory and advertising assumptions
Run at least three cases: expected sell-through, slower sell-through with higher storage allocation, and a launch case with elevated advertising. A product that only works in the optimistic case has little protection against fee or demand changes.
The calculator is a planning layer, not a substitute for Amazon's official Revenue Calculator or settlement reports.
Worked example: a $49.99 FBA item
- $14 product cost and a 15% referral-fee assumption
- $6.10 FBA, $0.45 storage, and $1.40 inbound placement per unit
- $6 ads, $0.60 packaging, and 6% expected return loss
The model estimates $10.59 net profit and a 21.2% net margin. Increasing storage, ads, or returns shows whether the current market price still protects the target margin.
Recalculate with your own numbersOfficial sources
Rates and eligibility vary by market, account, category, payment method, and program. Use the calculator for planning and the provider dashboard or statement for final reconciliation.