Amazon FBA Profit Calculator

What is Amazon FBA Profit Calculator?

An Amazon FBA profit calculator estimates whether a Fulfillment by Amazon product leaves a viable profit after the marketplace and fulfillment process are paid. FBA can simplify delivery and customer service, but the selling price must support referral fees, fulfillment charges, inventory acquisition, shipping into Amazon, storage, and promotion.

The calculator models a set of units sold, while most cost entries are averages for one unit. That makes the output useful for product research and for reviewing an existing SKU over a week or month. It reports total profit together with profit per unit, margin, and ROI, because an attractive sales total does not automatically indicate an attractive product.

How to calculate it

Multiply item price by units sold to establish revenue. Apply the referral percentage to revenue. Multiply fulfillment fee and other unit-level costs by units sold, including product purchase cost, storage, inbound shipping, ads, and miscellaneous costs. Subtract their sum from revenue.

Profit per unit makes it easier to compare products at different prices. Margin measures profit as a share of revenue, while ROI compares profit with costs committed. Fee schedules and size tiers can change, so the accuracy of this forecast depends on entering the correct fulfillment and referral assumptions for the specific SKU.

Formula

Revenue = Selling price x Units sold
Referral fees = Revenue x Referral fee percentage
FBA fees = Fulfillment fee per unit x Units sold
Total costs = Referral fees + FBA fees + (Product, storage, inbound shipping, ad, and other cost per unit x Units sold)
Net profit = Revenue - Total costs
Profit per unit = Net profit / Units sold
Profit margin = Net profit / Revenue x 100
ROI = Net profit / Total costs x 100

Example calculation

A product selling for $34.99 over 100 units produces $3,499 revenue. If product cost is $9, referral fee is 15%, fulfillment is $5, storage is $0.35, inbound shipping is $0.80, ads are $4, and other cost is $0.30 per unit, total cost is $2,469.85. Net profit is $1,029.15 or $10.29 per unit, with a 29.41% margin.

Why it matters for ecommerce sellers

Amazon sellers can encounter a product that appears profitable in sourcing research but underperforms after fulfillment and ad spend are included. Before ordering inventory, test changes in sale price, landed cost, conversion advertising expense, and fee tier. A narrow margin may not provide room for returns, coupons, or storage increases.

For operating products, update the calculator with actual average ad cost and inventory expense rather than relying on a launch estimate. It can support reorder decisions and identify which cost reduction has the greatest value. It remains an educational estimator; reconcile decisions against Seller Central reports and professional tax or accounting guidance where needed.

How to use this calculator

Enter a selling price, estimated units, and your product landed costs expressed per unit.
Add the referral percentage and current FBA fulfillment amount for the product's category and size tier.
Include per-unit storage, inbound shipping, advertising, and other operating allowances.
Test different scenarios and use per-unit profit, margin, and ROI when evaluating inventory decisions.

Frequently asked questions

Are all cost inputs per unit?+

Selling price and every non-percentage cost field in this calculator are modeled per unit. Enter average per-unit advertising or storage cost when reviewing multiple units.

Does this find Amazon fees automatically?+

No. Referral and fulfillment charges depend on category, size tier, weight, program, and policy changes. Enter rates and charges from your current seller information.

What is not covered in this estimate?+

Possible removals, returns, aged inventory surcharges, promotions, taxes, reimbursements, account subscription fees, and currency effects should be separately considered where relevant.