Amazon FBA Profit Calculator

The formula this Amazon FBA profit calculator runs

Net profit per unit = selling price − referral fee − FBA fulfillment fee − inbound shipping per unit − monthly storage per unit − product cost. The referral fee is computed as your referral percentage times the selling price, so it scales automatically when you test different price points. The "total Amazon fees" output sums the referral fee and the FBA fulfillment fee — the two charges Amazon deducts on every sale.

The break-even selling price output answers a different question: what is the lowest price at which this unit stops losing money? Because the referral fee is a percentage of price, you cannot just add up your costs — the calculator solves price × (1 − referral %) = product cost + FBA fee + inbound shipping + storage. Any listed price above that number produces positive profit per unit; anything below it means you are paying Amazon for the privilege of shipping your own inventory.

Net margin is simply net profit divided by selling price. Watch it alongside the dollar figure: a $6 profit sounds fine until you notice it is 12% of a $50 item that took ad spend to sell.

Referral fees: 15% for most categories, tiered for clothing

Amazon publishes its referral fee schedule at sell.amazon.com/pricing. Most categories sit at 15% of the selling price, which is why the calculator prefills 15 — but the percentage field is editable because your category may differ. Clothing and Accessories is the notable exception with a tiered structure: 5% on items priced at $15 or less, 10% on items priced between $15 and $20, and 17% on items priced above $20.

The tiers create pricing cliffs worth modeling. An apparel item at $19.99 carries a 10% referral fee ($2.00); reprice it at $20.50 and the fee jumps to 17% ($3.49). This Amazon FBA profit calculator lets you flip the percentage between tiers and immediately see whether the higher listed price actually nets you more per unit.

Why there is no universal FBA fulfillment fee number

The FBA fulfillment fee depends on your product’s size tier, shipping weight and category — a small standard-size item, an oversize package and a dangerous-goods SKU all price differently, and Amazon revises the schedule periodically. Quoting one flat number here would be wrong for most products, so the calculator does not pretend to know yours.

Instead, pull the exact fee for your ASIN from the Revenue Calculator inside Seller Central, which reads your product’s dimensions and weight and shows the current fulfillment charge. The dollar value prefilled in this tool is only an editable example — replace it with the figure Seller Central gives you and the rest of the math will be accurate.

• FBA fulfillment fee: Seller Central → Revenue Calculator, per ASIN.
• Referral fee percentage: sell.amazon.com/pricing for your category.
• Inbound shipping per unit: total freight on your last shipment to Amazon ÷ units in that shipment.
• Monthly storage per unit: your storage fee report ÷ average units in stock (optional, but honest).
• Product cost per unit: supplier invoice ÷ units, including any per-unit prep.

Worked example: a $40 kitchen product

Suppose you sell a kitchen gadget at $40.00 through Amazon FBA. Product cost is $9.00 per unit, the category referral fee is 15%, Seller Central shows a $5.40 fulfillment fee, inbound shipping works out to $1.10 per unit, and storage averages $0.50 per unit per month.

The referral fee is 15% of $40.00 = $6.00, so total Amazon fees are $6.00 + $5.40 = $11.40. Net profit per unit is 40.00 − 9.00 − 1.10 − 0.50 − 11.40 = $18.00, a 45% net margin. The break-even price is (9.00 + 1.10 + 0.50 + 5.40) ÷ 0.85 = 16.00 ÷ 0.85 = $18.82 — the floor for any coupon, Lightning Deal or repricer rule on this ASIN.

Note what the FBA calculation deliberately excludes: Amazon PPC spend. If ads drive a share of your sales, run the resulting margin through our ROAS calculator to find the break-even ROAS this product can support.

From FBA margins to restock timing

An Amazon FBA profit calculator decides whether an ASIN deserves reinvestment; sell-through speed and lead time decide when to reinvest. FBA adds a twist most sellers underestimate: your effective lead time is supplier production plus freight plus Amazon check-in, and running dry does more than pause revenue — it can bury the listing’s rank. ShelfOwl’s reorder point and latest order date calculators turn stock level, daily sales and that full lead time into a concrete order-by date for each SKU.

If you manage an FBA catalog of any size in a spreadsheet, the paid ShelfOwl forecaster does the batch version: upload one CSV of sales and stock and it returns the latest order date for every SKU, then emails you before each deadline. It costs $29 per month with a 14-day trial that requires no card.