Overview

Amazon calculates the cost of prepaid return labels for seller‑fulfilled orders using the package dimensions and weight you have saved in your return settings. If those figures are outdated or missing, you may overpay for each label or encounter carrier billing disputes. Keeping this data accurate is a low‑effort way to protect your margins.

Key Points

• Label pricing pulls from stored dimensions — When a buyer requests a return, Amazon looks up the length, width, height, and weight you entered for that SKU; an oversized entry can add several dollars to the label fee.
• Return Settings host the data — The SKU attributes tab inside the Return Settings menu is the single place to view, add, or edit package information for every product you sell.
• Both new and existing SKUs are editable — Whether you are launching a fresh item or correcting a long‑standing listing, the same interface lets you input or update the required fields.
• Four fields drive the calculation — Length, width, height, and total package weight are the only metrics Amazon uses to determine dimensional weight versus actual weight.
• Incorrect data inflates carrier charges — If the recorded dimensions exceed the real box size, carriers may apply a higher dimensional‑weight rate, and Amazon passes that cost to you.
• Regular audits prevent hidden expenses — Sellers who review their SKU attributes after packaging changes or seasonal bundling see up to a 15 % reduction in prepaid label spend, according to internal Amazon data.

How Package Dimensions and Weight Updates Work

1. Open Return Settings — Log into Seller Central, hover over Settings, select Return Settings, then click the SKU attributes tab; you’ll see a searchable list of all active SKUs.
2. Locate the target SKU — Use the search bar to type the ASIN or internal SKU; for a new product that isn’t listed, click Add new SKU attributes at the top of the page.