How to Calculate Your True Amazon Profit Margin
Revenue minus fees is not profit. Here is everything that stands between your sale price and what you actually keep.
Calculating true Amazon profit requires accounting for every fee, cost and deduction between your sale price and what reaches your bank account.
Why Amazon's Numbers Are Not Enough
Amazon Seller Central shows you revenue. It shows you some fees. But it does not know your cost of goods, your advertising spend per unit, your return processing costs, or — for EU sellers — your full VAT position. The profit figure shown in Seller Central is consistently overstated because it is missing the most variable and seller-specific costs.
True net profit on Amazon requires you to account for every cost that sits between the sale price and your bank account. This guide walks through each category.
The Amazon Profit Formula
Each line represents a real cost. Missing any one of them produces a profit figure that is higher than reality. The most commonly omitted items are advertising spend, return processing costs and long-term storage fees.
Referral Fees
Amazon charges a referral fee on every sale — a percentage of the sale price (including shipping) paid to Amazon for access to their customer base. The percentage varies by category: typically 8-15% for most product categories, with some categories (consumer electronics, for example) at lower rates and some (jewellery, Amazon Device Accessories) at higher rates.
Amazon publishes its full referral fee schedule by marketplace in Seller Central under Fees. Always use the correct category rate for your products — the wrong rate can materially misstate your margin calculation.
FBA Fulfilment Fees
If you use FBA, Amazon charges a per-unit fulfilment fee for picking, packing and shipping each order. This fee is based on the product's size tier and weight — larger, heavier items cost more to fulfil. Amazon publishes its FBA fee schedule for each marketplace in Seller Central. Fees are updated periodically.
In addition to the per-unit fulfilment fee, FBA charges monthly storage fees based on the cubic space your inventory occupies in fulfilment centres. Storage fees increase significantly in Q4 to reflect higher demand for warehouse space during peak season.
Products stored for extended periods incur long-term storage fees on top of standard monthly storage. These apply to inventory beyond a defined threshold — currently 365 days on most marketplaces. Long-term storage fees can be substantial for slow-moving products.
Cost of Goods (COGS)
Your cost of goods is the amount you paid to acquire or manufacture the product — the landed cost including purchase price, freight, customs duties and any other costs to get the product into your warehouse or Amazon's fulfilment centre. COGS is the single largest deduction from gross profit for most Amazon sellers and the most variable across products.
Profit analytics tools let you enter COGS per ASIN and apply it to every order automatically. Without accurate COGS data, any profit figure you calculate is an estimate. Keep COGS records updated when supplier prices or freight costs change.
Advertising Spend
For most Amazon sellers running Sponsored Products or Sponsored Brands campaigns, advertising is the second-largest cost after COGS. The correct way to account for advertising in your margin calculation is to calculate cost per unit sold attributable to advertising — not total ad spend, but ad spend divided by attributed units.
Amazon's native reporting shows ACoS (Advertising Cost of Sales) — ad spend as a percentage of attributed ad revenue. TACoS (Total Advertising Cost of Sales) shows ad spend as a percentage of total revenue, which is a more accurate reflection of advertising's true impact on your business. Profit analytics tools that connect to Amazon Advertising will calculate these figures automatically per campaign and per ASIN.
Returns and Refunds
Returns reduce your net revenue and generate additional costs: the refund itself (returned to the customer), return processing fees charged by Amazon, and the cost of any units damaged or unsaleable on return. For categories with high return rates — clothing, electronics, shoes — the return provision can materially affect true margin.
A simple approach: track your historical return rate per ASIN and multiply by the average total cost per return (refund amount plus processing fee plus estimated damage write-off). Apply this as a per-unit cost in your margin calculation.
Profit Analytics Tools
Calculating true profit manually across a large catalogue is impractical. Profit analytics tools connect to your Amazon Seller Central account and advertising accounts, pull all fee and revenue data automatically, and let you enter COGS per ASIN — producing a per-order and per-product profit figure continuously.
Amazon Profit Margin FAQ
What is a good profit margin on Amazon?
Net profit margins vary significantly by category, sourcing model and seller size. Private label sellers typically target 20-35% net margin. Wholesale and arbitrage sellers often operate on thinner margins — 10-20% — because of lower differentiation and higher competition. The correct benchmark is what your business model requires to generate acceptable return on capital after accounting for all costs including inventory investment.
Does Amazon Seller Central show my profit margin?
Not accurately. Seller Central shows revenue and some fee categories but does not deduct your COGS, advertising spend or return processing costs from a single view. The data to calculate profit exists within Seller Central reports but must be combined manually or via a profit analytics tool.
What is ACoS and how does it affect profit?
ACoS is Advertising Cost of Sales — your advertising spend divided by revenue attributed to ads. A 30% ACoS on a product with a 40% gross margin leaves 10% gross margin before other costs. If your ACoS exceeds your gross margin, you are losing money on every ad-attributed sale. Tracking ACoS per product against your product-level margin is essential for profitable advertising.
How do I calculate profit for FBM orders?
For FBM orders, replace the FBA fulfilment fee with your actual fulfilment cost — your warehouse labour, packaging materials, postage and any other costs to pick, pack and ship the order. The rest of the formula applies identically. FBM fulfilment costs vary much more than FBA fees, so accurate cost tracking per order size and shipping zone is important.