About Amazon FBA Calculator
Selling on Amazon through Fulfilled by Amazon can look like a passive-income dream, but the fee structure is dense enough to turn a promising product into a money-losing mistake. Between referral fees, fulfillment fees, inbound shipping, storage, and advertising, a seller can easily see 40% or more of revenue eaten by costs before any profit is booked. This calculator isolates the core unit economics of a single product so you can see whether an ASIN is worth sourcing. By entering your selling price, product cost, shipping to Amazon, referral fee percentage, and FBA fulfillment fee, you get a clear picture of referral fees, total cost, profit, and margin. That single view prevents the most common FBA error: falling in love with a product's top-line revenue while ignoring the bottom line. Use this tool before placing a purchase order, when repricing against competitors, or when negotiating with suppliers. If your margin is below 15%, you have little room for returns, ad spend, or storage fee spikes. If it is above 30%, you likely have a healthy buffer to scale with paid traffic.
How It Works
Amazon charges a referral fee as a percentage of the selling price, plus an FBA fulfillment fee based on the product's size and weight. You also have your own landed costs: the product itself and the shipping to get it to Amazon's warehouse. The calculator adds the referral fee, FBA fee, product cost, and inbound shipping to produce total cost per unit. Profit is selling price minus total cost, and margin is profit divided by selling price. This simplified model does not include monthly storage, long-term storage, returns processing, or advertising, so treat the result as a baseline rather than a final P&L.
Formula & Calculation Logic
Referral Fee = Selling Price × Referral Fee Percentage. Total Cost = Product Cost + Shipping to Amazon + Referral Fee + FBA Fee. Profit = Selling Price − Total Cost. Margin = (Profit / Selling Price) × 100. For example, a $30 item with an $8 product cost, $1 inbound shipping, 15% referral fee ($4.50), and $5.50 FBA fee has a total cost of $19 and a profit of $11, or a 36.7% margin. Add storage, ads, and returns to stress-test that margin before ordering inventory.
Step-by-Step Guide
- Step 1: Enter the price you plan to charge customers on Amazon.
- Step 2: Enter your landed product cost per unit from the supplier.
- Step 3: Enter the cost to ship one unit to Amazon's fulfillment center.
- Step 4: Enter Amazon's referral fee percentage for your category.
- Step 5: Enter the FBA fulfillment fee for your product's size tier.
- Step 6: Review referral fee, total cost, profit, and margin.
Example Calculations
- Scenario 1: $30 selling price, $8 product cost, $1 shipping, 15% referral fee, $5.50 FBA fee yields $4.50 referral fee, $19 total cost, $11 profit, and 36.7% margin.
- Scenario 2: $19.99 selling price, $5 product cost, $0.80 shipping, 15% referral fee, $3.22 FBA fee yields $3.00 referral fee, $12.02 total cost, $7.97 profit, and 39.9% margin.
- Scenario 3: $55 selling price, $22 product cost, $2 shipping, 8% referral fee, $8 FBA fee yields $4.40 referral fee, $36.40 total cost, $18.60 profit, and 33.8% margin.
Common Use Cases
- Validating a new private-label product idea before sourcing inventory.
- Comparing margins across multiple potential products.
- Deciding whether to raise or lower your selling price.
- Evaluating whether FBA is cheaper than merchant-fulfilled shipping.
- Preparing a profit estimate for investors or lenders.
Pro Tips
- Aim for at least a 25% to 30% gross margin to absorb returns and ad costs.
- Use Amazon's Revenue Calculator to cross-check current FBA fees for exact dimensions.
- Factor in packaging weight when estimating fulfillment fees.
- Avoid products with low selling prices because fixed FBA fees can wipe out margins.
- Track seasonal storage-rate changes, especially during Q4.
Common Mistakes to Avoid
- Forgetting inbound shipping costs when calculating landed cost.
- Using the wrong referral fee percentage for the product category.
- Ignoring returns, refunds, and disposal fees.
- Assuming the same margin applies across all marketplaces.
- Ordering inventory before confirming the FBA fee for the actual size tier.
Why Use This Tool?
- Quickly estimate true unit profit for any FBA product.
- Avoid sourcing products with hidden or thin margins.
- Compare pricing strategies side by side.
- Build a data-driven foundation for inventory decisions.