How to Calculate Your Real Amazon Profit

Many Amazon sellers know their revenue to the dollar but only have a rough idea of their profit. Seller Central shows sales front and center. The costs are spread across fee reports, ad consoles, invoices and storage charges. Add them up properly and some “best sellers” turn out to lose money.

This guide shows you how to calculate your real Amazon profit per unit and per month, with a worked example you can copy.

The basic formula

Profit = revenue minus all costs

Simple in theory. The hard part is making sure “all costs” really means all of them. Here is the full list for a typical FBA seller.

Every cost you need to include

1. Cost of goods (COGS)

What you paid the manufacturer per unit, plus packaging, labels and inspection costs.

2. Shipping to Amazon

Freight, duties, customs fees, insurance and local delivery to the Amazon warehouse. Divide the total by the number of units to get a per unit cost. Together with COGS, this is your landed cost.

3. Inbound placement fee

Amazon charges a placement fee on inbound shipments depending on how many warehouse locations you send to. Choosing fewer locations usually costs more per unit.

4. Referral fee

Amazon takes a percentage of each sale as a referral fee. For most categories it is about 15%, though some categories are lower or use tiered rates.

5. FBA fulfillment fee

A per unit fee for picking, packing and shipping each order. It depends on the size and weight of your product. A small change to your packaging can move you into a cheaper size tier.

6. Storage fees

Monthly storage fees based on how much space your inventory takes. Rates are higher from October to December. Products that sit for a long time can also face aged inventory surcharges.

7. Advertising

Your total ad spend for the product. Use total spend, not just the cost of ad-attributed sales.

8. Returns and refunds

Refunded sales, return processing fees, and the value of returned units you cannot resell.

9. Promotions and coupons

Discounts, coupon redemption fees and deal fees.

10. Other costs

Your seller subscription, software tools, photography, agency fees, Vine enrollment and other overheads. Spread these across your products by sales share.

A worked example

Say you sell a kitchen gadget for $29.99. Here is what one unit might look like.

• Selling price: $29.99
• COGS: $5.50
• Shipping to Amazon and duties: $1.40
• Inbound placement fee: $0.30
• Referral fee (15%): $4.50
• FBA fulfillment fee: $5.10
• Storage (average per unit sold): $0.35
• Returns (refunds and lost units, averaged): $0.70

Before ads, you keep $29.99 minus $17.85, which is $12.14 per unit, or about 40% of the price. That 40% is also your break-even ACoS.

Now add advertising. If your TACoS (ad spend divided by total sales) is 12%, ads cost about $3.60 per unit on average.

Profit per unit after ads: $12.14 minus $3.60 = $8.54, a net margin of about 28% before overheads.

These numbers are only an example. Fees change by category, size tier and year, so always use your own figures from Seller Central.

Per unit profit vs monthly profit

Per unit profit tells you if a product is worth selling. Monthly profit tells you if your business is healthy. To get monthly profit:

1. Download your monthly settlement or payments report from Seller Central. It shows sales, fees, refunds and reimbursements.
2. Add your ad spend for the month from the ads console.
3. Add COGS for the units sold that month.
4. Add your fixed costs for the month.
5. Subtract everything from total sales.

Where profit usually leaks

• Oversized packaging that pushes products into a more expensive FBA tier.
• Slow moving stock building up storage and aged inventory fees.
• Wasted ad spend on search terms that never convert. See our guide on cutting wasted ad spend.
• High return rates caused by listings that set the wrong expectations.
• Lost or damaged inventory that Amazon owes you for but you never claim.
• Coupons left running long after they were needed.

How to raise profit without raising price

• Cut ad waste and move budget to proven keywords.
• Improve conversion with better images and copy, so the same ad spend brings more sales.
• Reduce returns with clearer listings. For Hisdern, better visuals and sizing information cut returns 21%.
• Review packaging dimensions for cheaper FBA tiers.
• Keep inventory lean to avoid storage surcharges.
• Negotiate COGS as your order volume grows.

Track it every month

Set up a simple spreadsheet or dashboard that shows profit per ASIN every month. Watch the trend, not just the total. A product slowly losing margin is easy to miss until it is a problem.

When we built a clear reporting dashboard for j5create, combining ads, Brand Analytics and catalog data in one place, wasted spend fell 33% and revenue grew 22%. Seeing the full picture makes better decisions easier.

If you want this set up for your store, see our reporting and dashboards service, or get a free audit to find out where your margin is leaking.

FAQs

What is a good profit margin on Amazon?

Many healthy private label brands aim for a net margin of 15% to 30% after all costs, including ads. Margins before ads are usually much higher, often 35% to 50%.

What fees does Amazon charge FBA sellers?

The main fees are the referral fee on each sale, the FBA fulfillment fee per unit, monthly storage fees, inbound placement fees and any optional fees such as advertising, coupons and deals.

How do I calculate profit per unit on Amazon?

Take the selling price and subtract COGS, shipping to Amazon, referral fee, FBA fee, storage, returns, and your average ad cost per unit. What is left is your profit per unit.

Should I include ad spend in my profit calculation?

Yes, always. Use total ad spend for each product. Leaving it out is the most common reason sellers think a product is profitable when it is not.