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How to Calculate Amazon FBA Fee

What is Amazon FBA Fee?

The Amazon FBA Fee Calculator estimates total Amazon fees per unit sold through Fulfillment by Amazon: the referral fee (8–20% depending on category), the FBA fulfillment fee (size and weight based, $3.06–$10+ per unit), and monthly storage fees (per cubic foot). For arbitrage, wholesale, and private label sellers, this calculation determines whether a product is profitable before sourcing.

Formula

Net Profit = Selling Price − Referral Fee − Fulfillment Fee − Storage Fee − Item Cost − Inbound Shipping
P
Selling Price (currency) — Listed Amazon retail price
Ref%
Referral Fee % (%) — Category commission: 8–20%, $0.30 minimum
FF
Fulfillment Fee (currency/unit) — Pick, pack, ship by size and weight tier
SF
Storage Fee (currency/unit) — Cubic feet × monthly rate × storage months

Step-by-Step Guide

  1. 1Enter selling price and item cost (your cost from supplier)
  2. 2Add inbound shipping (cost to send product to Amazon FBA warehouses)
  3. 3Select product category — referral fees range from 8% (electronics, grocery) to 20% (jewelry)
  4. 4Choose size tier — Small Standard (under 1 lb), Large Standard, or Large Bulky
  5. 5Enter unit weight and average storage months
  6. 6Calculator applies current Amazon FBA fee schedule for fulfillment by size/weight
  7. 7Storage fees use Q1–Q3 base rates ($0.78/cu ft small, $0.56/cu ft large); Q4 holiday rates are roughly 3× higher
  8. 8Net profit per unit and profit margin are shown with category-specific color coding

Worked Examples

Input
$25 price, $8 cost, $1.50 ship to FBA, general 15%, small standard 1 lb, 3 months storage
Result
Referral $3.75 + Fulfillment $3.43 + Storage $0.09 = $7.27 fees, net profit ~$8.23, margin 33%
Input
$45 price, $12 cost, $3 ship, electronics 8%, large standard 2 lb, 2 months storage
Result
Referral $3.60 + Fulfillment $5.78 + Storage $0.20 = $9.58 fees, net profit ~$20.42, margin 45%
Input
$15 price, $5 cost, $1 ship, books 15%, small standard 0.5 lb, 6 months storage
Result
Referral $2.25 + Fulfillment $3.15 + Storage $0.19 = $5.59 fees, net profit ~$3.41, margin 22.7%

Common Mistakes to Avoid

  • ✕Forgetting that referral fees have a $0.30 minimum — low-priced items pay disproportionately more
  • ✕Using off-peak storage rates for Q4 — October to December storage fees roughly triple ($2.40/cu ft small)
  • ✕Ignoring long-term storage surcharges — items in FBA over 271 days incur extra fees
  • ✕Misclassifying product size tier — items over 12" or 1 lb often qualify as Large Standard with higher fees

Frequently Asked Questions

What is the minimum referral fee?

Amazon charges a $0.30 minimum referral fee regardless of category percentage. For items under $2, this minimum makes FBA unprofitable.

When do Q4 storage fees apply?

October, November, and December — typically 3× the off-peak rate. Plan inventory to minimize Q4 storage exposure unless holiday-driven sales offset the cost.

What is long-term storage fee?

Items in FBA for over 271 days incur a $6.90/cu ft surcharge applied monthly. Slow-moving inventory should be removed before crossing this threshold.

Ready to calculate? Try the free Amazon FBA Fee Calculator

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