Amazon FBA Size Tier Checker
AMAZON SELLER TOOL

FBA Size Tier Checker

Enter package dimensions and weight to auto-detect your FBA size tier, and see the 2026 US FBA fee changes (effective Jan 15, 2026) — including the new Small/Large Oversize split and SIPP packaging fee. 100% local, no data uploaded.

🇺🇸 US FBA size tiers · 2026 fee rules (effective 2026-01-15) · for reference only

📐 Auto Size Tier Lookup

Enter your packaged length, width, height and weight (inches / lb). The tool sorts the sides for you.

Small Standard Small Standard-size
Weight ≤12 oz Longest ≤15" Median ≤12" Shortest ≤0.75"
2026 fee changes
· Price $10-$50: +$0.25/unit
· Price <$10: +$0.12/unit, plus ~$0.86 low-price discount
· Price >$50: +$0.51/unit
· Apparel: fee bands split from 4 oz to 2 oz
Large Standard Large Standard-size
Weight ≤20 lb Longest ≤18" Median ≤14" Shortest ≤8"
2026 fee changes
· Price $10-$50: +$0.05/unit
· Price <$10: unchanged (low-price discount applies)
· Price >$50: +$0.31/unit
· Apparel: fee bands split from 0.5 lb to 0.25 lb
Small Oversize New 2026 tier
Weight <50 lb Longest <37" Median <28" Shortest <20" Girth <130"
Fee ↓ $2.06/unit avg
Split from the former Large Oversize tier. SIPP discount removed; items not enrolled in SIPP pay ~$2.07/unit packaging fee (most SIPP items see a net decrease).
Large Oversize New 2026 tier
Weight <50 lb Longest <59" Median <33" Shortest <33" Girth <130"
Fee ↓ $0.26/unit avg
Split from the former Large Oversize tier. SIPP discount removed; items not enrolled in SIPP pay ~$2.07/unit packaging fee.
Extra-Large Oversize
Weight ≥50 lb or exceeds Large Oversize limits
Fee ↓ $2.08/unit avg
Most segments decrease; irregular-size items (extra-large segment) increase to cover extra handling. Covers the former Medium/Large/Special Oversize range.

📋 2026 US FBA Fee Changes at a Glance (effective 2026-01-15)

Fee item2026 change
Overall fulfillment fees+$0.08 per unit on average (below 0.5% of average selling price)
Standard-size fees$10-$50: Small +$0.25 / Large +$0.05; <$10: Small +$0.12, Large unchanged, with ~$0.86 low-price discount (was $0.77); >$50: Small +$0.51 / Large +$0.31
Oversize feesSplit into Small Oversize and Large Oversize; Small ↓$2.06, Large ↓$0.26; SIPP discount removed, ~$2.07/unit packaging fee if not enrolled
Extra-large oversize fees↓$2.08/unit average; most segments down, irregular-size segment up
ApparelFiner fee bands: Small Standard 4 oz→2 oz, Large Standard 0.5 lb→0.25 lb
Fuel surcharge3.5% fuel & inflation surcharge on fulfillment fees from 2026-04-17
Inbound placementStandard-size single-warehouse shipments +$0.05/unit avg; new weight bands (3-20 lb) for Large Standard-size inbound fees
Inbound defect feeUnified single fee, ~$0.60/unit (no longer stacked with placement fees)
StorageBase monthly storage & utilization surcharge unchanged; aged inventory surcharge (365+ days) increased (see official schedule)
Low-inventory feeNow based on FNSKU days-in-stock (>28 days) instead of parent ASIN; grocery exempt; now applies to Small/Large Oversize
Removal/disposal-$0.20/unit for aged standard-size items under 0.5 lb
Referral feesUnchanged; coupon variable fee capped at $2,000/coupon (created from 2025-11-05)

📦 FBA Monthly Storage Fees (US, 2026 base rates unchanged)

Fee typePeriodStandard-sizeOversize
Monthly storageNon-peak (Jan-Sep)$0.87/cu ft/mo$0.56/cu ft/mo
Monthly storagePeak (Oct-Dec)$2.40/cu ft/mo$1.40/cu ft/mo
Aged surcharge271-365 days+$3.80/cu ft extra
Aged surcharge365+ days+$6.90/cu ft extra (2026: increased — check official schedule)

💡 Example: a standard-size item using 0.5 cu ft stored 30 days in July costs about 0.5 × $0.87 = $0.44; in November about 0.5 × $2.40 = $1.20. Aged surcharges stack on top of monthly storage. 2026: base monthly rates unchanged, 365+ day surcharge increased.

⚠️ Disclaimer: Size tiers and fee changes are based on Amazon's US 2026 announcement (effective 2026-01-15). Actual fees vary by category (apparel, hazmat), packaging, inbound placement fees, storage-utilization surcharges and other factors. Always confirm with the official Seller Central fee schedule. This tool is for reference only and is not financial or business advice.

How to Measure

  1. Measure the final packaged dimensions (longest, median and shortest side in inches) and total shipping weight in lb.
  2. Enter them in the checker above — the tool sorts the sides automatically.
  3. Girth = longest side + 2 × (median + shortest). The result shows your tier and the 2026 fee adjustments that apply.

FAQ

What changed with FBA fees in 2026?

Effective Jan 15, 2026, standard-size fulfillment fees rose slightly based on price bands (average +$0.08/unit). The old Large Oversize tier was split into Small Oversize and Large Oversize with lower fees (down $2.06 and $0.26 on average), the SIPP discount was removed with a ~$2.07 packaging fee for non-SIPP items, and Extra-Large Oversize fees fell $2.08 on average. A 3.5% fuel & inflation surcharge starts April 17, 2026.

What is the SIPP packaging fee?

SIPP (Ships in Product Packaging) lets you ship items in their own packaging without an extra Amazon box. In 2026 Amazon removed the SIPP discount for oversize items; if your oversize item is not enrolled in SIPP, an average packaging fee of about $2.07 per unit applies. Most items already using SIPP see a net fee decrease.

How is girth calculated?

Girth = longest side + 2 × (median side + shortest side). For example a 30 × 20 × 10 in box has a girth of 30 + 2 × (20 + 10) = 90 inches. Girth matters for oversize tier classification.

What is the low-price fee discount?

Items priced below $10 qualify for a fulfillment fee discount averaging about $0.86 per unit in 2026 (up from $0.77). Small Standard-size items under $10 also see their fee rise $0.12, so the discount still leaves a net benefit for most low-price listings.

Why does the size tier matter?

Fulfillment fees jump sharply by tier. A product that crosses from Large Standard to Small Oversize can see its per-unit fee rise by several dollars, and oversize items now also face the SIPP packaging fee. Knowing your tier before listing helps you price correctly and optimize packaging.

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