How Amazon FBA Fee Worksheets Work
Referral percent meets fixed fulfillment dollars—then COGS decides whether the ASIN is worth sending.
How Amazon FBA Fee Worksheets Work
FBA fee math mixes a percentage (referral) with dollar fees that depend on size and weight (fulfillment), plus storage you may attribute per unit. An educational worksheet keeps those layers separate so you can see contribution after product cost—without pretending to be Seller Central.
The Question a Worksheet Can Answer
Revenue = price × units. Referral = revenue × referral%/100. Fulfillment, storage, and other Amazon fees scale with units. Total Amazon fees = sum of those lines. Net after Amazon = revenue − total fees. Contribution profit = net after Amazon − product cost. Effective fee percent = total Amazon fees ÷ revenue × 100.
Inputs Worth Labeling
Practical sourcing habits
- Copy referral percent from the correct product category.
- Pull FBA fulfillment from the size/weight tier that matches your packaged product.
- Attribute monthly or aged storage deliberately—or set it to zero if tracked in overhead.
- Use landed COGS (product + inbound) before you celebrate contribution profit.
Try the Amazon FBA Fee Calculator
Enter a labeled scenario and review the outputs:
Open Amazon FBA Fee CalculatorA Transparent Worked Example
$29.99 × 1 unit with 15% referral, $5.47 FBA, $0.50 storage, $0 other, $8 COGS → referral $4.50, Amazon fees $10.47, net after Amazon $19.52, contribution $11.52. Drop the price to $8 with heavy fulfillment and the same worksheet will show a loss—useful before you buy inventory.
Formula map
| Name | Equation |
|---|---|
| Revenue | salePricePerUnit × units |
| Referral fees | revenue × referralPercent / 100 |
| Total Amazon fees | referral + (fulfillment + storage + other) × units |
| Contribution profit | revenue − totalAmazonFees − productCost |
What to Keep Outside the Model
Sponsored Products spend, coupon discounts, return rates, and long-term storage spikes belong in a broader P&L. Use this worksheet for the Amazon fee + COGS core, then layer ads and refunds separately.
Related Tools
Compare marketplace stacks with the Etsy and eBay fee calculators, then stress-test pricing with profit margin, break-even, shipping cost, and dropshipping profit worksheets.