Amazon FBA Fees Calculator: Profit, Margin & ROI per ASIN

For Amazon US sellers comparing supplier costs, planned prices and FBA profit across a product list. About $0.018 per successful ASIN calculation. Checking 50 products costs about $0.90 before plan discounts, plus the small Actor start fee. No Amazon login, seller account, API key or account cookies are required.

Paste ASINs or product URLs and your costs. Get profit, margin, ROI, Amazon fees and a break-even price checked against Amazon's public Revenue Calculator.

What you get

Field	What it tells you
verdict	A readable per-unit profit or loss statement, with whole-number margin and ROI
asin, productTitle, productUrl	The exact product that Amazon matched
sellingPrice, priceSource	Your planned price, or the current featured-offer item price
referralFee	Amazon's category-dependent referral fee at that price
fbaFulfillmentFee	The complete estimated FBA fulfillment fee, including the fuel surcharge
baseFulfillmentFee, fuelSurcharge	The separate components Amazon exposes; do not add the surcharge twice
storageFee, storageSeason	Allocated storage per unit sold, using the chosen month's rates
closingFee, digitalServicesFee	Additional selling-fee lines when Amazon returns them
totalAmazonFees, totalCostPerUnit	Amazon fees, then Amazon fees plus your costs
netProfit, marginPercent, roiPercent	Per-unit economics with numeric percentages for spreadsheets
breakEvenPrice, breakEvenProfit	The lowest checked cent with non-negative estimated profit
buyBoxSeller, shipsFrom, fulfillmentMethod	Public featured-offer context; the model itself always calculates FBA
category, categoryCode	Public catalog category information
feeDate, feeSource, feeSourceUrl, checkedAt	The calculation date, original source and retrieval timestamp
peakFulfillmentApplies, futureFulfillmentFees	Whether peak fulfillment applies and any announced future FBA amount
productDetails	Optional public item/package dimensions, weight and browse path when available
recordType, status, note	Distinguish paid calculations, free notes and the free summary

Every run saves a SUMMARY record with the best and worst margins and a readable REPORT.html. The dataset has separate profit, fees and source views. Export JSON, CSV, Excel or another supported dataset format from Apify. In an integration, filter for recordType = CALCULATION before adding the rows to a product-cost spreadsheet.

A real example

On 14 October 2026, a cloud run checked B0D5CLSMFB, an Anker 10,000 mAh power bank, using a $6 product cost and the $23.99 public featured-offer price. It returned:

Profit $10.45 per unit (44% margin, 174% ROI) at $23.99: referral $3.60, FBA $3.92, storage $0.02.

The numerical margin was 43.54%, ROI was 174.09%, and break-even was $11.71. The $3.92 fulfillment fee included a $0.13 fuel surcharge. Amazon also returned an announced $4.14 fulfillment amount for 15 October 2026. These are dated observations, not promises that this ASIN will keep the same price or fees.

One paced sample calculation finished in 7.2 seconds. An earlier run with a source retry took 56 seconds. The Actor starts at most one ASIN every three seconds and sends one request at a time. Break-even checks, optional product-page details and retries add time, so large jobs can take longer than three seconds per ASIN. Run one job at a time for a product list rather than launching many overlapping copies.

When to use it

Compare wholesale quotes, check planned prices, identify losses, model holiday fees or allocate storage using stock turnover. This Actor does not predict sales, authenticity, selling eligibility or Buy Box wins.

How to use it

1. Enter US ASINs or product URLs. Duplicates are removed.
2. Enter a common cost or per-ASIN costs. Add shipping and other expenses where relevant.
3. Run, compare verdicts, then export the dataset or open the report. Check free notes for unavailable ASINs.

Set Apify's maximum charge before larger jobs. A sample calculation costs less than $0.02 at the base rate.

Inputs

Input	Default	Example and meaning
asins	No automatic list	["B0D5CLSMFB", "B002DYIZH6"]; up to 1,000 unique ASINs
urls	Empty	["https://www.amazon.com/dp/B0D5CLSMFB"]; an alternative to ASINs
costPerUnit	Required for each calculation	6; your product acquisition cost in USD
costPerUnitByAsin	Empty	{"B0D5CLSMFB": 6, "B002DYIZH6": 18}; overrides the common cost
sellingPrice	Public featured-offer item price	19.99; the price you intend to charge
sellingPriceByAsin	Empty	{"B0D5CLSMFB": 21.99}; overrides the common selling price
inboundShippingPerUnit	0	0.50; your inbound transport cost per unit
otherCostsPerUnit	0	1.20; prep, ads, expected returns, placement or other costs you choose to include
unitsPerMonth	1	100; expected units sold per month, used for storage allocation
averageInventoryUnits	Same as monthly sales	20; average stock on hand, giving a stock-to-sales ratio of 0.2 in this example
feeDate	Today in US Eastern time	2026-10-15; announced future dates through 2027-01-14 are supported
marketplace	US	Only Amazon.com and USD are currently implemented
includeProductDetails	false	true adds a slower public-page read for optional dimensions and browse path

Apify's form requires each field to have one type. Use the named ByAsin maps for per-product values rather than mixing numbers and objects in the form. Costs must be finite and non-negative. Selling price and monthly sales must be greater than zero. Missing costs, unsupported marketplaces and malformed ASINs produce free notes when they reach the Actor. Apify can reject a JSON type mismatch before a run starts.

{
  "asins": ["B0D5CLSMFB", "B002DYIZH6"],
  "costPerUnitByAsin": {
    "B0D5CLSMFB": 6,
    "B002DYIZH6": 18
  },
  "inboundShippingPerUnit": 0.50,
  "otherCostsPerUnit": 0.75,
  "unitsPerMonth": 100,
  "averageInventoryUnits": 20
}

How the calculations work

Net profit is price minus Amazon fees, product cost, inbound shipping and other costs. Margin is profit divided by price. ROI is profit divided by product cost plus inbound shipping plus other costs. Zero investment produces null ROI.

Storage equals Amazon's monthly estimate for one inventory unit multiplied by average inventory divided by monthly sales. Without an inventory input, the assumption is one month of storage per unit sold. Entering zero inventory deliberately models zero storage.

Arithmetic retains fractional-cent storage values. Currency outputs round to cents; numeric percentages keep two decimal places. Independently rounded fee lines can differ from the displayed total by one cent.

Break-even queries Amazon at candidate prices and checks fee bands around $10, $15, $20 and $50, including boundary cents and minimum referral fees. It returns the first non-negative cent in the earliest profitable band, keeping your costs and storage assumptions fixed.

Current and peak-season fees

The source is Amazon Revenue Calculator (public, signed out). Its fulfillment total already includes the fuel surcharge; the separate surcharge field is informational.

The published 2026 holiday fulfillment window is 15 October 2026 through 14 January 2027. Peak storage covers October through December. January can therefore have peak fulfillment and non-peak storage. Peak verdicts say incl. peak.

For future rates, feeEffectiveDate is Amazon's announced date. For current rates it is the retrieval date, explicitly labeled in feeEffectiveDateMeaning, not the original schedule start. feeScheduleUrl links to Amazon's schedule. Historical dates and dates beyond the implemented schedule produce free notes.

Pricing and spending limits

Successful calculations	Base calculation charge
1	$0.018
10	$0.18
50	$0.90
100	$1.80
1,000	$18.00

The small Apify Actor start charge is additional: $0.00005 per GB, with a minimum of one start unit. Bronze calculations are $0.0171 each, Silver $0.0162 and Gold or higher $0.0144. Apify displays the rate for your plan before you run.

Only a successful ASIN calculation is charged. Invalid inputs, exact-match failures, source errors, duplicates and the summary do not incur a calculation charge. The start charge still applies to a run that only returns free notes. There is no separate default dataset-row charge, and the paid price includes the Actor's platform usage.

When the remaining budget cannot cover another calculation, the Actor stops cleanly and writes its summary. The ASIN count limit is 1,000 per run for all users; there is no smaller free-plan wall. Split larger catalogs into sequential jobs and keep the same cost assumptions if you want comparable results.

Use through the API

For a small request, use the synchronous dataset endpoint. Keep the token in an environment variable:

curl -X POST \
  'https://api.apify.com/v2/acts/moggedhq~amazon-fba-calculator/run-sync-get-dataset-items?maxTotalChargeUsd=0.20' \
  -H "Authorization: Bearer $APIFY_TOKEN" \
  -H 'Content-Type: application/json' \
  -d '{"asins":["B0D5CLSMFB"],"costPerUnit":6}'

Python:

import os
import requests

response = requests.post(
    "https://api.apify.com/v2/acts/moggedhq~amazon-fba-calculator/run-sync-get-dataset-items",
    headers={"Authorization": "Bearer " + os.environ["APIFY_TOKEN"]},
    params={"maxTotalChargeUsd": 0.20},
    json={"asins": ["B0D5CLSMFB"], "costPerUnit": 6},
    timeout=300,
)
response.raise_for_status()
calculations = [row for row in response.json() if row["recordType"] == "CALCULATION"]

JavaScript:

const response = await fetch(
  "https://api.apify.com/v2/acts/moggedhq~amazon-fba-calculator/run-sync-get-dataset-items?maxTotalChargeUsd=0.20",
  {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.APIFY_TOKEN}`,
      "Content-Type": "application/json"
    },
    body: JSON.stringify({asins: ["B0D5CLSMFB"], costPerUnit: 6})
  }
);
if (!response.ok) throw new Error(`Apify request failed: ${response.status}`);
const rows = await response.json();

For larger lists, use asynchronous runs and retrieve the dataset after completion. Tasks, schedules, webhooks, Make, Zapier and n8n accept the same inputs. Avoid overlapping jobs.

Use with AI agents (MCP)

Connect an agent to Apify MCP and ask it to find an Amazon FBA fees calculator. Give it your ASINs, cost prices and maximum spend. A useful request is:

Calculate Amazon FBA fees and profit for B0D5CLSMFB at a $6 cost. Include referral, fulfillment, October storage, margin, ROI and break-even. Spend no more than $0.20 and explain any source-limit notes.

Agents should read the input schema and inspect recordType and status in results. This Actor requires no third-party AI key.

Limits you should understand

Guests cannot see the package dimensions, shipping weight or exact size tier Amazon uses internally. Those fields remain null. Optional retail measurements are separate: item size is not automatically package size. No local-table fee is fabricated when Amazon cannot estimate an ASIN.

Some real listings are unavailable in the public calculator. On 14 October 2026, 48 of 50 varied physical ASINs matched; the other two also returned unrelated results in the guest UI. Those matches were rejected. Coverage changes over time.

Amazon can throttle the source. The Actor uses a stable guest proxy session, sequential requests, Retry-After and backoff up to about 60 seconds. Persistent limits stop the remaining list, with free notes. Check the calculation count even when the Apify run succeeds.

Tax, ads, returns, aged or low inventory, storage-utilization surcharges, inbound placement, prep and seller-plan subscriptions are not automatically modeled. Add your own costs. Featured FBM offers supply price context; this Actor models FBA.

FAQ

Are Seller Central credentials required? No. Only signed-out public data is used.

Can each ASIN have a different cost? Yes: use costPerUnitByAsin. sellingPriceByAsin works the same way.

Are other countries supported? No. This version supports Amazon.com and USD only.

Are low-price FBA rates included? Amazon calculates the applicable fee at each requested selling price, including relevant low-price rates.

Is fuel counted twice? No. fuelSurcharge is already inside fbaFulfillmentFee.

Why does storage differ from the UI? The guest UI may initially select January-September. Compare the same season and inventory-to-sales ratio.

Why did a valid listing return a note? Exact matching, price or source access may be unavailable. A price override helps only when price is the missing value.

Is break-even guaranteed profit? It is an estimate under your entered costs. Additional charges or later fee changes alter the result.

Why is ROI null? Product, inbound shipping and other costs sum to zero.

Are failed ASINs charged? No calculation charge applies. The small run start charge is independent.

Can I process hundreds of products? Yes, up to 1,000. Use an asynchronous run, set a maximum charge and run lists sequentially.

Amazon FBA fees calculator, Amazon FBA profit calculator, referral fees, fulfillment fees, storage costs, margin, ROI and break-even price for US ASIN lists.