Overview

Amazon will revamp its Fulfillment by Amazon (FBA) fee calculation for parcel‑size items on October 15, 2025. The overhaul replaces the long‑standing two‑tier system with seven distinct size brackets and moves all pricing to a unit‑weight‑only model. Sellers should care because the new structure is projected to lower fees for most products while requiring a fresh cost analysis across all marketplaces.

Key Points

• Unit‑weight pricing replaces dimensional weight — Fees will be based solely on the actual weight of each unit, discarding the previous “greater of weight or size” rule.
• Seven size tiers replace the old “small” and “standard” categories — Amazon introduces five additional brackets that more closely match the true pick‑,‑pack‑,‑ship cost of each item.
• More product categories now fall under the new fee schedule — Items such as adhesives, cable ties, and a wide range of accessories are included for the first time.
• Returns processing fee expands on November 1 — Additional high‑return categories, including apparel accessories and certain electronics, will incur a processing charge when return rates exceed a set threshold.
• Staggered global rollout — The United Kingdom and several European marketplaces adopt the changes on October 15, 2025; a second wave launches on November 1 for the remaining regions.

How the New Size Tiers Work

1. Identify the product’s unit weight — Measure the exact weight of a single unit (e.g., a 120‑gram silicone spatula). This weight alone determines the base fee, regardless of box dimensions.
2. Match the unit to one of seven size tiers — Amazon provides precise length, width, height, and weight limits for each tier. For example, a compact Bluetooth earbud case measuring 8 × 5 × 2 cm and weighing 30 g falls into Tier 2, while a larger kitchen gadget measuring 25 × 15 × 10 cm and weighing 150 g lands in Tier 5.
3. Apply the tier‑specific unit‑weight rate — Each tier carries a per‑pound (or per‑kilogram) charge. If Tier 2 is priced at $0.25 per ounce, the 30‑g earbud case (≈ 1.06 oz) incurs a fee of roughly $0.27.