Amazon FBA Fee Calculator

What an FBA seller pays on every unit

Selling through Fulfillment by Amazon means Amazon picks, packs and ships the item for you, and it charges for that on every unit. The money Amazon takes is not one number. It is several fees stacked on top of each other, and each one is worked out differently, so a single percentage guess will send you wrong.

This calculator breaks the stack into the three lines that matter: the fulfillment fee, the referral fee and the monthly storage fee. It uses the 2026 US fulfillment rate card published on Amazon Seller Central, which took effect on January 15, 2026. Amazon also runs higher peak rates from October 15 to January 14, and it has applied a 3.5% fuel and logistics surcharge since April 17, 2026.

Rates change, and the current rate card in Seller Central is the one that counts. Use this as a planning estimate before you price a product, then confirm the exact figure for your own SKU in the Revenue Calculator or the Fee and Economics Preview report inside your seller account.

Three separate fees, three separate lines

The three fees are charged at different times, on different bases, and by different rules. Keeping them apart is the whole point, because each one has a different fix.

The fulfillment fee falls when you make the box smaller. The referral fee falls only when you change the category or the price. The storage fee falls when you hold less stock or turn it faster. Three different problems, three different fixes, which is why you should never add them into one blended percentage.

The referral fee is a percentage of the total sales price, the item price plus any shipping and gift wrap the buyer pays, with a per item minimum of $0.30. Amazon lists the rates by category on its referral fees page. Home and Kitchen, Office Products, Toys and Games, Pet Products and most other categories sit at 15%, while a few, such as Baby Products and Beauty, drop to 8% on items priced at $10.00 or less.

Size tier decides the fulfillment fee

The size tier is the biggest single lever on the fulfillment fee. A small standard item can ship for about $3.32, while the same item that tips into large standard can cost well over $5.00. Amazon sets the tier from the packaged dimensions and the weight.

Price matters too. The 2026 card has three price bands: under $10, $10 to $50 and over $50. A small standard item at 2 oz costs $2.43 under $10, $3.32 in the middle band and $3.58 above $50. Products priced under $10 get Low Price FBA rates that Amazon says run $0.86 per unit less on average than the standard rates.

The rates above are the non-peak card that took effect January 15, 2026. Peak rates, which apply from October 15 to January 14, run higher on the same tiers, and the 3.5% fuel and logistics surcharge sits on top of both.

Weight or dimensional weight, whichever is bigger

For everything except small standard, Amazon bills on the greater of the unit weight and the dimensional weight. Dimensional weight is the volume of the box turned into a weight, and in the US it comes from dividing the cubic size by 139.

• Dimensional weight (lb) = length x width x height (in inches) / 139
• A 12 x 9 x 4 inch box is 432 cubic inches, and 432 / 139 = 3.11 lb
• The item inside weighs 12 oz, which is 0.75 lb
• Shipping weight = the greater of 3.11 lb and 0.75 lb = 3.11 lb

That single line is where most new sellers lose money. The item weighs three quarters of a pound, but Amazon charges as if it weighed just over three pounds, because the box is mostly air. Amazon published the same arithmetic in its own example of a monitor packed at 54 x 35 x 3.5 inches, where the 41 lb unit was billed on a dimensional weight of 47.59 lb.

Two moves fix this. Shrink the box, because the divisor of 139 means every 139 cubic inches you take out is a pound off the billed weight. Or make the product flat, because a thin item can drop into small standard where unit weight alone is used.

Worked example: a $24 item at 500 units a month

Take a $24 item that weighs 12 oz and ships in a 12 x 9 x 4 inch box, selling 500 units a month with 500 units sitting in the warehouse.

• Dimensional weight = 12 x 9 x 4 / 139 = 3.11 lb, so the box is billed at 3.11 lb rather than 0.75 lb
• Size tier = large standard, which puts the shipping weight in the band just over 3 lb
• Fulfillment fee = $6.97 for the first 3 lb plus $0.08 for one 4 oz interval = $7.05
• With the 3.5% surcharge, $7.05 x 1.035 = $7.30 per unit
• Referral fee = 15% of $24 = $3.60 per unit
• Storage = 432 / 1728 = 0.25 cubic feet, x $0.78 = $0.20 per unit per month
• Selling fees per unit = $7.30 + $3.60 = $10.90, leaving $13.10 before your product cost

Over a month of 500 units, that is $3,648.37 in fulfillment fees, $1,800.00 in referral fees and $97.50 in storage, or $5,545.88 in total against $12,000.00 of revenue. What is left is $6,454.13, and out of that you still have to pay for the product itself, inbound shipping and any advertising.

Now change one number. Pack the same item in a flatter 12 x 9 x 2 inch box and the dimensional weight drops to 1.56 lb, which lands in the 1.5+ to 1.75 lb band at $5.57, or $5.76 with the surcharge. That is $1.54 a unit back, or $770 a month on 500 units, for a box change.

Storage fees and the October jump

Storage is a monthly charge on the space your inventory takes up, worked out from your average daily volume in cubic feet. It is the fee most easy to forget, because it does not show up on the order line. It shows up at the end of the month.

The October jump is more than three times the off peak rate, so stock that sits through the holidays is expensive. On 500 units of the 0.25 cubic foot example, that is $97.50 a month from January to September and $300.00 a month in the fourth quarter.

Amazon also adds a storage utilization surcharge once your inventory runs past 22 weeks of supply, measured as the ratio of stored volume to shipped volume. The full rate table is on the monthly inventory storage fees page. A slow mover can end up paying $1.22 to $2.66 per cubic foot instead of $0.78, which turns a cheap product into a losing one.

The fees this calculator does not cover

Three main charges sit outside this calculator, and they are real money on some SKUs.

• Inbound placement service fee. Charged per unit when you send stock to the fulfillment centers, based on size tier and weight. It is a cost of getting the inventory in, not of selling it.
• Low inventory level fee. Charged on shipped units when your stock falls below 28 days of supply against demand.
• Aged inventory surcharge. Charged on units that have sat in the warehouse for long stretches, on top of the utilization surcharge.

Apparel uses a different fulfillment rate card, so clothing sellers should read the apparel table rather than the one on this page. Other charges can apply too, including removal and disposal order fees, returns processing on some categories, and refund administration fees of 20% of the referral fee on a refunded order.

Advertising is not an Amazon fee but it belongs in the same calculation. Sponsored Products cost comes straight off the margin you just worked out, so treat the net figure from this calculator as the ceiling for what you can spend to win a sale.

How to check your numbers before you price a product

Before you commit to a price, run the same product through three checks.

• Measure the box as packed, not the product. One extra inch of height on a 12 x 9 box adds 108 cubic inches, which is 0.78 lb of billed weight at the 139 divisor.
• Check the price band you land in. Crossing $50 moves the fulfillment fee into the highest band, so a $49.99 price can be worth more than $51.00 once the fee is applied.
• Confirm the tier in Seller Central. Amazon measures every unit itself, and it can move a product between tiers after a remeasurement. If a fee looks wrong, ask for a remeasurement.

For the money side of running the business around these fees, the Small Business Administration's guide to managing your business covers bookkeeping, taxes and cash flow for small sellers.

This is a planning estimate built on the 2026 non-peak rate card published January 15, 2026, and it excludes apparel. Amazon revises fees on set dates, runs a separate peak card from October 15 to January 14, and adds a 3.5% fuel and logistics surcharge from April 17, 2026. Confirm your own figures in Seller Central before you price or reorder.