FBA Calculator: How to Calculate Amazon FBA Profitability
Quick Definition
An FBA calculator estimates your profit per unit by subtracting Amazon fees (referral, fulfillment, storage), product costs, shipping, and advertising from your selling price.
What an FBA Calculator Does
An FBA calculator takes your product details — selling price, cost of goods, shipping, product dimensions, and weight — and calculates your net profit after all Amazon fees. This includes the referral fee (8-20% depending on category), FBA fulfillment fee (based on size and weight), monthly storage fees, and optionally advertising costs. The output tells you whether a product is worth selling.
Amazon's Revenue Calculator
Amazon offers a free Revenue Calculator in Seller Central that estimates fees for any existing ASIN. It's accurate for fee estimation but limited — it doesn't factor in COGS, shipping to Amazon, advertising costs, or return rates. You also need an Amazon seller account to access it. It's a starting point, but not sufficient for real profitability analysis.
Third-Party FBA Calculators
Jungle Scout's FBA Profit Calculator is bundled with their $49/month subscription. Helium 10's Profitability Calculator comes with their $79/month plan. AMZScout offers one at $49.99/month. Sellerboard ($19/month) specializes in profit tracking. Keepa tracks pricing but doesn't offer a full profit calculator. Most require a paid account for full functionality.
AstroMarket's Free FBA Calculators
AstroMarket offers two free calculators that cover the full picture. The FBA Profit Calculator computes per-unit profit, margin percentage, and ROI from your selling price, COGS, shipping, Amazon fees, and ad costs. The FBA Fee Estimator breaks down referral fees, fulfillment fees, and storage costs based on product dimensions, weight, and category — covering all 23+ Amazon category fee structures. Both are free with no account required.
Key Numbers to Calculate
Before sourcing any product, you should know: (1) Net profit per unit after all fees, (2) Profit margin percentage (aim for 25%+ after ads), (3) ROI on your inventory investment, (4) Break-even units — how many you need to sell to recoup your initial investment, and (5) Break-even ACOS — the maximum advertising cost before losing money. A good FBA calculator gives you all five numbers.
Related Terms
Amazon FBA
FBA (Fulfillment by Amazon) is a service where Amazon stores your products, picks, packs, and ships orders to customers, and handles customer service and returns.
Amazon FBA Fees
Amazon FBA fees include a referral fee (8-20% of selling price), a fulfillment fee ($3-$10+ per unit based on size/weight), and monthly storage fees ($0.87-$2.40 per cubic foot).
Profit Margin
Profit margin is the percentage of revenue that remains as profit after subtracting all costs. For e-commerce, this includes product cost, platform fees, shipping, and advertising.
COGS
COGS is the total direct cost of producing or acquiring the products you sell. It includes manufacturing, materials, and freight — but not marketing, rent, or salaries.
ACOS
ACOS (Advertising Cost of Sales) is the percentage of ad spend relative to attributed sales revenue. An ACOS of 25% means you spent $25 in ads to generate $100 in sales.
Amazon Sales Estimator
An Amazon sales estimator converts a product's Best Seller Rank (BSR) and category into estimated daily and monthly unit sales, helping sellers gauge demand before entering a niche.
Put FBA Calculator data to work
AstroMarket analyzes fba calculator alongside competition, trends, sourcing costs, and social signals — all in one AI-powered report.