How to use this amazon fba profit calculator
Use this as a planning tool before sourcing inventory or raising sponsored ads budget. Always compare estimates with your actual seller account reports.
Platform-specific inputs
Use Amazon FBA-specific inputs such as referral fee, FBA fulfillment cost, storage or overhead, return rate, and Sponsored Ads spend to estimate true product profit.
Use it before launching a product, changing price, increasing ad spend, testing a new marketplace, or deciding whether a campaign can scale. The calculator is not tied to one platform, so it can be used for Shopify stores, TikTok Shop, Etsy, Amazon-style marketplaces, dropshipping offers, and direct-to-consumer products.
Why break-even ROAS matters
ROAS alone does not tell you whether a campaign is profitable. Break-even ROAS shows the minimum return on ad spend required after the product's real cost structure. If your campaign ROAS is below break-even, sales volume can still lose money.
Core formulas
- Net profit = revenue + shipping charged - product cost - shipping cost - platform fees - payment fees - return loss - tax or overhead - ad spend.
- Profit margin = net profit divided by total revenue.
- Break-even ROAS = product revenue divided by gross profit before ads.
- Maximum ad spend = gross profit before ads.
Common seller mistakes
- Calculating margin before payment fees and marketplace fees.
- Ignoring return loss when testing a product with high refund risk.
- Scaling paid ads because ROAS looks good while net profit is negative.
- Comparing products only by revenue instead of profit per unit.
What Amazon FBA fees should I include?
Include landed product cost, referral fee, FBA fulfillment fee, storage or overhead, returns, fixed closing fees where applicable, and Sponsored Ads spend.
Does this calculator replace Amazon Seller Central reports?
No. It is a planning calculator. Use it for product research and ad planning, then compare results with your actual Seller Central fee and sales reports.
How does Sponsored Ads spend affect Amazon FBA profit?
Sponsored Ads spend directly reduces net profit. The calculator shows maximum ad spend and break-even ROAS so sellers can estimate whether a campaign can scale profitably.
Free seller worksheet coming soon
We are preparing a downloadable profit worksheet for sellers who want to compare multiple products and ad scenarios in one place.