Amazon FBA Profit Calculator

This tool breaks down your Amazon FBA unit economics: selling price minus product cost, inbound shipping, Amazon's referral fee, the FBA fulfillment fee, and your PPC ad spend per unit. The result is your true net profit per unit and per month — the number that decides whether a product is worth launching.

1. 1
   Enter your selling price

   The price customers pay for one unit.

2. 2
   Add product and inbound costs

   Supplier cost plus freight into Amazon's warehouse, per unit.

3. 3
   Set Amazon's fees

   Referral fee % for your category and the FBA fee for your size tier.

4. 4
   Include monthly ad spend

   Your PPC budget spread across units sold.

5. 5
   Read net profit and margin

   Per-unit profit, monthly profit, and true net margin %.

• ▸Referral fee: typically 15% of the sale price on most categories (8% on some, with a $0.30 minimum per item).
• ▸FBA fulfillment fee: a flat per-unit fee based on size tier and weight — small standard items are a few dollars; check Amazon's rate card.
• ▸Monthly storage: charged per cubic foot; rates roughly triple in October–December.
• ▸Optional costs: removal orders, prep services, Vine reviews, coupons, and Lightning Deals all add up.

Profitable FBA products share a pattern: a selling price between roughly $20 and $70, small and light enough for cheap fulfillment, and a category where the top sellers don't have thousands of entrenched reviews. Price matters because Amazon's per-unit fees are relatively fixed — a $15 product and a $40 product in the same size tier pay similar fulfillment fees, but the $40 product absorbs them far more easily.

Weight and dimensions deserve special attention because they drive the FBA fulfillment fee directly. Crossing from small-standard to large-standard can add several dollars per unit — often the difference between a 30% margin and a 15% margin. Before committing to a supplier, get exact product dimensions and weight, then look up the precise fee tier.

Ad spend is the variable most new sellers underestimate. Launching a product typically requires aggressive PPC to rank, and cost-per-click in competitive categories can run $1–$3+. Model your profit with realistic launch-period ad spend, not steady-state spend. If the numbers only work once ads are turned off, the product probably doesn't work.

Use the table above as sanity-check ranges when filling in the calculator. If your supplier quotes or fee estimates fall far outside these bands, double-check your inputs before making a go/no-go decision.

FBA isn't the only way to sell online, and the right model depends on your margins and appetite for operations. Selling on your own Shopify store avoids Amazon's referral fee but adds customer acquisition cost — run both scenarios with the Shopify Profit Calculator to compare. A dropshipping model removes inventory risk entirely but usually produces thinner margins; the Dropshipping Profit Calculator models that trade-off.

Many successful sellers eventually run a hybrid: FBA for volume and Prime visibility, plus a direct store for higher-margin repeat customers. Whichever path you choose, unit economics come first — no amount of marketing fixes a product that loses money on every sale.