It is Amazon's published 2026 rate card applied to the dimensions and weight you enter. Amazon bills on its own measurements of your unit, so compare with the Fee Preview report in Seller Central.

Fee Optimizer

Enter packaged dimensions, weight and price, or load them from your Amazon listing. See your 2026 FBA fee with every step of the math, the smallest change that reaches a cheaper fee, and the per-unit and yearly amount for each.

View a sample report · no signup

Why not paste this into ChatGPT?

Same inputs, same fee, with the math shown. Your carton runs through Amazon's 2026 US rate card in code: sides sorted, dimensional weight (L × W × H ÷ 139), shipping weight, size tier, the weight row and price column, then the 3.5% fuel and logistics surcharge. Each step is listed, so you can check it line by line.
Dated rules. Rate card, size tiers, referral fees and storage rates checked Oct 7, 2026. The holiday peak fee is added by ship date (Oct 15, 2026 to Jan 14, 2027), with the surcharge on top of it.
The nearest cheaper fee line for each side, the weight and nearby prices. The page searches each of them for the smallest change that reaches a cheaper fee, and warns when your carton sits within 0.25 in or 4 oz of a size tier change or a fee jump of $0.25 or more. Sliders recompute in your browser without using a run.
Fee numbers are not written by the model. A language model writes only the packaging and inbound ideas. Dollar figures it writes itself are removed; every fee on the page comes from code.
Saved with the inputs. Each report keeps your dimensions, price and ship date, so the next check of the same ASIN shows what changed since the last one.

Honest note: a chat assistant with a code tool can do this math too, if you give it the 2026 rate card, size tiers, surcharge and storage rates and keep them current. Amazon's Fee Preview report and Revenue Calculator are the source of truth for the exact fee Amazon charges today, because Amazon bills on its own measurements of your unit. Use this page to see why the fee is what it is and which change lowers it. Amazon rules checked Oct 5, 2026.

How to Reduce Your Amazon FBA Fees in 2026

Amazon FBA fees now consume 40-55% of the average seller's revenue. Between referral fees, fulfillment fees, inbound placement fees, storage costs, and the new 2026 penalties, many sellers are operating on margins below 10% without realizing it. The problem is complexity - Amazon has over 20 different fee types, each with its own calculation rules, size tier thresholds, and seasonal variations.

Fee Optimizer runs your package dimensions, weight and price through Amazon's 2026 rate card and shows each step of the fee. It checks your size tier classification (many sellers are overpaying because their product dimensions cross a tier boundary by millimeters), finds the smallest change to a side, the weight or the price that reaches a cheaper fee, shows storage per unit at both seasonal rates, and lists the low-inventory and aged-inventory fees for your size, so you can plan stock levels in Restock Planner.

Common Fee Savings Opportunities

Size tier optimization is the biggest lever - reducing your product's longest dimension by even 0.5 inches can drop you into a lower tier and save $1-3 per unit. Packaging weight reduction, removing unnecessary inserts, and switching to poly bags instead of boxes can also move you down a tier. Inbound placement strategy matters too: since Jan 15, 2026 Amazon-optimized splits carry no inbound placement fee, while a minimal split costs $0.14-$1.90 per unit for standard size - though shipping to several warehouses raises your carrier cost. And keeping about 35-45 days of inventory avoids both the LIVE fee (charged under 28 days of supply) and the aged inventory surcharge (from 181 days).

Frequently Asked Questions

How much can I actually save?

Typical savings range from $0.50-$3.00 per unit, depending on your product. For a seller moving 1,000 units/month, that's $500-$3,000/month in recovered margin. Size tier optimization alone often saves $1+ per unit. The report shows the exact amount for your product, and says so when no change within reach lowers your fee.

What data do I need to provide?

Package dimensions (length, width, height), packed weight and selling price. Category, monthly units and COGS are optional. Use your packaged dimensions - that is what Amazon bills on. The more accurate your measurements, the better the recommendations.

Does Fee Optimizer handle seasonal storage fees?

Yes - it shows storage per unit at the Oct-Dec rate ($2.40/cu ft vs $0.78 for standard size) and at the Jan-Sep rate, and the aged inventory surcharge per unit for your size from 181 days. Plan reorder quantities and timing in Restock Planner.

Is the fee exact?

It is Amazon's published 2026 rate card applied to the dimensions and weight you enter, with each step shown. Amazon bills on its own measurements of your unit, so compare with the Fee Preview report in Seller Central. If Amazon's measurements look wrong, you can request a remeasurement through Seller Support.

How is this different from the Profit Calculator?

The Profit Calculator shows you what your margins are. Fee Optimizer tells you how to improve them: it finds the size, weight or price change that reaches a cheaper fee and adds packaging and inbound ideas for your product.

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