Amazon FBA Fees Fully Explained: Real Cost Breakdown for 2025

Many new sellers get shocked when they calculate their actual profit because they only accounted for the referral fee. Amazon FBA has four distinct cost layers, and you need to understand all of them before pricing your product.

The four categories are: (1) Referral Fee — Amazon's commission on every sale. (2) FBA Fulfillment Fee — charged per unit shipped. (3) Monthly Storage Fee — charged per cubic foot of inventory. (4) Optional fees — returns processing, removal orders, aged inventory surcharges.

Let's break each one down with 2025 numbers.

The referral fee is a percentage of the total sale price (including shipping charged to the buyer). It is charged on every order regardless of fulfillment method.

Common referral fee rates in 2025: Kitchen & Dining: 8%. Health & Personal Care: 8%. Sports & Outdoors: 8%. Electronics: 8%. Apparel & Accessories: 17%. Jewelry: 20% on first $250, 5% above. Grocery & Gourmet Food: 8%.

For most categories Taiwan brands enter (kitchen tools, sports, health), budget 8% as your referral fee. On a $29.99 item, that is $2.40 going to Amazon before anything else.

The fulfillment fee covers Amazon picking, packing, shipping, and customer service for each order. It is determined by the product's size tier and shipping weight.

2025 FBA fulfillment fees for standard-size products: Small standard (under 4 oz): $3.22. Small standard (4–8 oz): $3.40. Large standard (8 oz–1 lb): $4.75. Large standard (1–2 lb): $5.68. Large standard (2–3 lb): $6.40. Large standard (3+ lbs): $6.40 + $0.32 per additional half-pound.

Example: A kitchen knife set weighing 1.2 lbs in its box pays $5.68 per unit in fulfillment fees. On a $39.99 sale, that is 14.2% of revenue before referral.

Oversized items (anything over 18" on the longest side or over 20 lbs) pay dramatically higher fees — $9.73 to $75+. Design your product packaging to stay within standard-size dimensions.

Amazon charges per cubic foot of warehouse space used. The rate changes drastically between peak and off-peak seasons.

Standard-size products: January–September: $0.87/cubic foot/month. October–December (Q4): $2.40/cubic foot/month — nearly 3x higher. Oversize: $0.56/cubic foot (Jan–Sep), $1.40/cubic foot (Oct–Dec).

A product 12" × 8" × 4" (about the size of a shoebox) uses approximately 0.22 cubic feet. At $0.87/month, storing 500 units costs $95.70/month. At the Q4 rate, that jumps to $264/month for the same inventory.

Long-term storage surcharge: units stored over 365 days are charged an additional $6.90/cubic foot or $0.15/unit (whichever is greater) monthly. This is how Amazon discourages sellers from using their warehouses as free long-term storage.

Product: stainless steel kitchen tool set. Factory cost (Taiwan, landed in US): $7.00. Amazon selling price: $34.99.

Deductions: Referral fee (8%): −$2.80. FBA fulfillment fee (1.2 lb standard): −$5.68. Storage fee (per unit allocated monthly): −$0.25. PPC advertising (estimated 12% ACoS): −$4.20. Total Amazon-side costs: −$12.93.

Gross profit per unit: $34.99 − $7.00 − $12.93 = $15.06. Gross margin: 43%. This is healthy — most FBA sellers target 30–40% after all costs.

If the margin calculation comes out below 25%, either negotiate the factory cost down, raise the retail price, or choose a lighter/smaller product to reduce FBA fees.