Amazon Measured My Product Wrong: How to Fix a Size-Tier Error and Get Refunded

u/giftwrapgenius on r/AmazonFBA, October 2025: "Amazon just inputted an incorrect measurement for one of my big selling items. I am out of remeasurements for this month. Their new measurement pushes my fulfillment fees into the new size tier which means I am paying Amazon more to fulfill than I am making off of the sale."

This is common enough that seasoned FBA sellers audit measurement errors as a monthly workflow. The fix is four-part: detection in your fee report, Seller Central remeasurement, a Cubiscan certificate when the math supports it, and a refund claim.

How the mismeasurement happens

Fulfillment centers scan a product's packed dimensions during receiving. Scanners are tuned for speed. They get fooled by:

• Soft packaging that compresses under the scan bar. Bubble mailers, poly bags, and any item where the packed size depends on fill can read tall on one FC and short on another.
• Side-orientation errors. A 12 x 4 x 2 inch item scanned with the 12-inch dimension read as its width lands in a different tier from the same item scanned correctly.
• Inconsistent results across FCs. u/funwithfriends-11 captured the recurring version on Reddit: "They would improperly scan one side wrong in one specific FC and it would push me up to the higher tier."

Once a bad measurement lands on your ASIN, every unit at that FC bills at the higher tier's fulfillment fee until you get it corrected. On a fast-moving SKU, a single bad scan costs hundreds of dollars before the monthly fee report finishes running.

How to spot it in your own account

The fastest tell is a per-unit fulfillment fee that does not match the calculator value for your product's stated packed dimensions. Three places to check:

1. FBA Fulfillment Fee Preview report. Compare the fulfillment fee column to what the calculator returns for your packed dimensions and weight. A gap of $0.50 or more per unit on a single SKU is a near-certain measurement error.
2. Size Tier column on the same report. If it shows a tier inconsistent with your own packed dimensions, Amazon has the wrong measurement on file.
3. Per-ASIN fee history. A step change in per-unit fulfillment fee on a date when the product did not change is almost always a remeasurement.

How to request a remeasurement

Amazon's process, as of April 2026:

1. Open Seller Central > Inventory > Manage FBA Inventory.
2. Find the ASIN. Click "Measure and reweigh" under the unit-info menu.
3. You get 3 free remeasurements per ASIN per month. Amazon pulls a sample of units at the next FC arrival and re-scans them.
4. The new measurement replaces the old. It can fix the error or create a different one.

The catch: if remeasurement goes the wrong way, you cannot appeal except with a 3rd-party certificate.

When Cubiscan is worth it

What you need to do is to get it measured by a 3rd party like Cubiscan and send this certificate to Amazon. Also don't forget to claim back the overcharge.

Cubiscan is the industry-standard 3rd-party dimensioning service. A certificate costs in the $75 to $200 range per SKU depending on region. The math works when:

• The SKU sells more than 100 units per month.
• The fee delta between tiers on that SKU is $0.30 per unit or more.
• At 100 units and $0.30 per unit, a single month's overcharge covers the certificate.

Below those thresholds, using your 3 free remeasurements per month and waiting is usually the right call.

Claiming the refund

Amazon will refund fulfillment-fee overcharges from the date the incorrect measurement was applied. Process:

1. Get the corrected measurement (Amazon remeasure or Cubiscan).
2. Open a case with Seller Support. Cite the ASIN, the old measurement, the new measurement, and the date range.
3. Attach the Cubiscan certificate if you have one.
4. Refunds land as a credit on your next disbursement. Typical turnaround is 2 to 4 weeks.

The refund is capped by Amazon's normal reimbursement look-back, which is 18 months as of April 2026 (subject to change).

The preventive version

The cheapest time to catch a size-tier error is before you ship. Our free size-tier calculator takes your raw dimensions and your prep padding type, then returns:

• The packed dimensions Amazon should see.
• The tier you belong in.
• A warning badge if your packed size is within 1 inch of a tier boundary.

Run the size-tier check

If the calculator tier and your Seller Central tier disagree, Amazon has a bad measurement on file. Catch it before your next replenishment ships.