How Amazon FBA Fees Are Calculated (2026 Guide)

1. Measure the packaged unit

Amazon prices the unit as it will ship: product, packaging, inserts and label. Sort the sides from longest to shortest; Amazon does the same, so orientation doesn't matter. Our example is a kitchen gadget in a 9 × 6 × 2 inch box weighing 12 oz, sold for $24.99.

2. Find the size tier

The unit goes into the smallest tier whose every limit it fits. Small standard is at most 15 × 12 × 0.75 in and 16 oz; large standard is at most 18 × 14 × 8 in and 20 lb; then small bulky, large bulky and extra-large. At 2 in thick our box is too deep for small standard, so it is large standard. The size tier calculator checks any box.

3. Work out the billed weight

Every tier except small standard bills on the greater of the unit weight and the dimensional weight, which is length × width × height ÷ 139. Here that is 108 ÷ 139 = 0.78 lb, or 12.4 oz: more than the real 12 oz. Amazon bills on 12.4 oz. That one detail moves the unit up a row. More in the dimensional weight guide.

4. Read the fulfillment fee from the rate card

Each tier has weight rows, and since January 15, 2026 each row has three price columns: under $10, $10 to $50, and over $50. 12.4 oz falls in the 12+ to 16 oz row; at $24.99 the column is $10–$50: $4.60. Apparel and dangerous goods use their own cards. The full card is on the fee tables page.

5. Add the surcharge and, in season, peak rates

Since April 17, 2026 a 3.5% fuel and logistics surcharge is added to the fulfillment fee: $4.60 becomes $4.76. Between October 15, 2026 and January 14, 2027, the holiday peak rate replaces the base fee and the surcharge applies to that instead. See holiday peak fees.

6. Add the referral fee

The referral fee is Amazon's commission, a share of the total sale price set by category, usually with a $0.30 minimum. Home and Kitchen is 15%: $3.75. A few categories change rate at a price threshold, sometimes on the whole price; the referral fee lookup handles all of them.

7. Add storage and the fees that depend on how you run inventory

Storage is charged per cubic foot per month: our box is 0.0625 cu ft, so two months January to September costs $0.10. Depending on your stock you may also pay the low-inventory-level fee, the aged-inventory surcharge, returns processing and inbound placement.

The whole example

Line	Per unit
Sale price	$24.99
Referral fee	−$3.75
FBA fulfillment, with surcharge	−$4.76
Storage, 2 months	−$0.10
Amazon pays out (before storage)	$16.48
Product, freight and prep	−$7.10
Advertising at 10% of sales	−$2.50
Returns allowance	−$0.11
Net profit	$6.67
Margin / ROI	26.7% / 93.9%
Break-even price	$16.09