Amazon FBA Calculator: How to See Your Real Profit Before You Buy Inventory

Quick answer: The Amazon FBA calculator, officially the Revenue Calculator, is Amazon’s free tool for previewing fees, costs, and estimated net profit before you commit inventory. It lives behind Amazon’s Estimate fees and costs page and compares FBA against fulfilling orders yourself. It is a preview, not an accounting system: real margin still needs tracking after launch.

This guide shows where the calculator lives in 2026, how to run it in five minutes, which costs it previews versus which hit your statements later, and the weekly margin check that turns estimates into decisions.

Where the Amazon Revenue Calculator lives now

Amazon’s current entry point is its Estimate fees and costs page, which describes the tool in one line: calculate fees, costs, and revenue for a current or future product, comparing Fulfillment by Amazon and your own fulfillment method. The calculator itself opens in Seller Central from that page.

Two things worth knowing before you click:

• You can search Amazon’s catalog for an existing product, or define a new one by entering its category, dimensions, weight, and price.
• The old standalone address for the tool now returns a 404, so ignore any guide pointing at sell.amazon.com/tools/revenue-calculator.

How to use the FBA calculator in 5 minutes

Amazon’s own walkthrough on its Seller blog (updated August 2025) breaks the tool into three moves. Here is the working version:

Step	What you do	Watch out for
1. Add the product	Search by ASIN, UPC, ISBN, or title, or define a new product with dimensions and category	Wrong category means wrong referral fee estimate
2. Enter your numbers	Sale price, cost of goods, monthly units sold, estimated units in storage, plus your own shipping costs in the comparison column	Use landed cost per unit, not the factory quote
3. Estimate and compare	The tool returns estimated net profit and net margin for each fulfillment scenario, with a third column for an alternate scenario	Run a pessimistic case: lower price, slower sales

Ten minutes here beats ten weeks of selling a product that never had margin. If you are still choosing what to buy, pair this with our sourcing playbook before any purchase order goes out.

The fee numbers you can trust today

Every figure below was checked today, August 16, 2026, at sell.amazon.com/pricing. Anything not listed there changes often enough that you should pull it live rather than trust a blog screenshot.

Cost	Current public figure	Source status
Individual selling plan	$0.99 per item sold	Verified today
Professional selling plan	$39.99 per month	Verified today
Referral fee, most categories	15%, with a $0.30 minimum per item	Verified today
Referral fee range examples	8% (full-size appliances) up to 45% (Amazon device accessories); clothing runs 5% to 17% by price	Verified today
Closing fee, media categories	$1.80 per item	Verified today
FBA fulfillment, storage, aged inventory, returns processing, inbound placement rates	Not published on the public pricing page	Pull current rates from the FBA fee pages in Seller Central or inside the calculator itself

That last row is deliberate. Older guides, including the previous version of this post, hardcoded storage rates that no longer match Amazon’s published numbers. Rates move; your process should assume it.

What the calculator previews versus what hits later

The calculator previews the big three: referral fee, FBA fulfillment fee, and monthly storage, plus closing fees where they apply. Amazon’s own walkthrough is candid that some costs are not built in, long-term storage among them.

Costs that commonly appear on statements after launch:

• Aged inventory surcharges once units sit past 181 days
• Returns processing, and refund-related costs when buyers send items back
• Inbound placement and prep charges on the way in
• Removal, disposal, or liquidation when a product fails
• Advertising, the largest omission of all: the calculator does not know your PPC spend

For the full tour of the quiet ones, see the hidden Amazon FBA fees most sellers meet on their first settlement report.

From estimate to true contribution margin

Here is how we map profitability for the brands we manage: at the ASIN level, as true contribution margin after fees, storage, and returns. Not account-level revenue, not gross margin at the factory quote. Per unit, per ASIN:

• Start: sale price
• Minus: referral fee (15% for most categories, verified today)
• Minus: FBA fulfillment fee (from the calculator or your fee preview)
• Minus: landed product cost (factory, freight, duty, prep)
• Minus: allocated monthly storage, returns cost, and ad spend per unit sold
• Equals: true contribution margin

The calculator gives you the first three lines before launch. The last two only show up in your real data after launch, which is why an estimate is a starting point and never a verdict.

The weekly margin review: the discipline behind the tool

The calculator is the starting point. The weekly margin review is the discipline. In our weekly P&L review, any SKU running under 10% contribution margin gets flagged, and every flag gets one of four responses:

1. Reprice: test a higher price if conversion can hold.
2. Recost: renegotiate the supplier, freight, or pack size driving the landed cost.
3. Refee: audit fees, dimensions, and category; then check for stranded inventory quietly paying storage while earning nothing.
4. Retire: exit the SKU before aged surcharges finish the job.

Run that loop weekly and the calculator becomes what it should be: the front door of a margin system, not a one-time reassurance before a large buy.

FBA or your own fulfillment: use the comparison column

The calculator’s side-by-side view exists for one question: does Amazon’s fulfillment fee cost less than you would spend picking, packing, shipping, and handling storage yourself? Fill in your real self-fulfillment costs, including your time, before deciding. For most small teams, heavy or slow-turning products are where self-fulfillment deserves a serious look.