How it works
How to calculate your Amazon FBA fees
Enter your product details
Add your selling price, product cost, and what it costs to ship each unit to Amazon. This gives the calculator your revenue and base expenses.
Pick your category and enter dimensions
Choose the right product category for your referral fee rate. Then enter the packaged dimensions and weight so the calculator can estimate fulfillment and storage fees.
See your real profit per unit
Get a full breakdown of every fee, your net profit, profit margin, and ROI. Use it to decide if the product is worth selling or if you need to adjust your price.
Common mistakes that kill Amazon margins
Most sellers lose money not because their product is bad, but because they missed a cost somewhere.
Ignoring dimensional weight
Amazon charges based on whichever is larger: actual weight or dimensional weight. A lightweight but bulky product can cost way more to fulfill than you expect.
Forgetting Q4 storage spikes
Storage fees triple from October to December. If your product sits in Amazon's warehouse during peak season without selling fast, those fees eat into your holiday profits.
Using the wrong referral rate
Not all categories charge the same percentage. Electronics over $100 pay 8%, but under $100 they pay 15%. Picking the wrong category in your calculations throws off your entire margin.
Not counting inbound shipping
Getting your product from the factory to Amazon's warehouse is a real cost. A lot of sellers forget to include it, then wonder why their actual profit is lower than projected.
Underestimating ad spend
PPC costs on Amazon keep rising. If you are spending $3 per sale on ads and your profit per unit is $5, your real margin is much thinner than the product page suggests.
Skipping the calculator before sourcing
Run these numbers before you place a purchase order. Finding out a product is not profitable after you have 500 units in a warehouse is an expensive lesson.
More free tools
All tools →FAQ
Questions, answered
It estimates your total cost and profit per unit sold through Amazon FBA. You get a breakdown of referral fees, fulfillment fees, storage costs, and any other expenses you enter. The point is to see your real net profit before you commit to a product.
Amazon takes a percentage of your selling price on every sale. The rate depends on your product category. Most categories are 15%, but some like electronics charge 8% above a certain price threshold and 15% below it. Getting the category wrong is one of the most common mistakes sellers make when estimating profit.
It uses your product dimensions and weight to determine the size tier (standard or oversize) and then applies Amazon's fee schedule. This matters because even a small change -- like an extra inch on the longest side -- can push you into a higher tier and add a dollar or more per unit.
Yes. Amazon charges $0.78 per cubic foot from January through September and $2.40 per cubic foot from October through December. The calculator lets you toggle between non-peak and peak so you can see how Q4 storage impacts your margins.
ROI tells you how much profit you make relative to the money you put in. If you invest $9 per unit (product cost + shipping + prep) and make $6 profit, your ROI is about 67%. A product with lower margins but higher ROI is often a better use of your capital than one with high margins but expensive inventory.
Yes. Use the Other Costs field to add your average PPC spend per unit. It is not a perfect model since ad costs fluctuate, but it gives you a more realistic picture than ignoring ads entirely.
Because Amazon FBA has more fee layers than most sellers realize. Referral fee, fulfillment, storage, inbound shipping, and prep all add up. The calculator just makes those costs visible. Most of the time the surprise is not that a fee exists -- it is that nobody added them all up before.
That is exactly what it is built for. Plug in different product prices, costs, and dimensions to see which one gives you the best margin and ROI. Running these numbers before you order inventory can save you from committing to a product that looks good on paper but loses money after fees.
Selling on Amazon? Reviews close the sale
Products with more reviews rank higher and convert better. WiserReview helps you collect authentic product reviews that build the trust Amazon shoppers look for.
7-day free trial · from $6.75 a month, billed yearly