Amazon FBA Profit Calculator — Free Tool (2026)
Enter your buy price and Amazon selling price. Get your referral fee, FBA fulfillment fee, net profit, ROI, and BNPL-adjusted Day-1 return in seconds.
FBA Profit Calculator
How to Use This Calculator on a Sourcing Run
In-store, you don't have time for a calculator on every product. Use this for pre-run practice on products you're considering, and use the Amazon Seller App or SellerAmp for live in-store calculations. Here's the mental math shortcut experienced sellers use:
For most standard-size products in health, toys, and home categories: if your buy cost is less than ⅓ of the Amazon sale price, you'll likely achieve 20%+ ROI. Example: $10 buy cost needs at least $30 Amazon price to be worth considering.
Not a substitute for the full calculation — use the 3× rule to quickly discard obvious misses and run the full math on promising items.
What This Calculator Doesn't Include
- Monthly storage fees — these are per-cubic-foot charges that vary by how long inventory sits. If your item sells in under 30 days, storage is negligible and can be excluded.
- FBA prep costs — poly bags, bubble wrap, labels if you use a prep center. Add $0.25–1.50/unit depending on your prep setup.
- Returns — Amazon may return items at your expense. In low-return categories (toys, health), this is minimal. In clothing, it's a real cost to model.
The Starter Kit includes a more detailed spreadsheet calculator — with storage, prep costs, return rate, and BNPL payment schedule all in one model.
Get the Starter Kit — $37Frequently Asked Questions
This calculator uses 2026 Amazon fee rates and is accurate for standard-size products in major arbitrage categories. Accuracy depends on the correct category selection — referral fee percentages differ significantly between categories (8% for electronics vs 17% for clothing). For exact per-item fees, SellerAmp in-store or Amazon's official FBA Revenue Calculator on Seller Central are the most accurate sources.
ROI (Return on Investment) here shows your net profit as a percentage of your buy cost. An ROI of 25% means for every $100 you spend on clearance inventory, you net $25 after all Amazon fees. For BNPL arbitrage, the effective Day-1 ROI is much higher because you only put 25% down with Afterpay — a $100 inventory buy costs you $25 on Day 1.
Target a minimum of 20% ROI on your buy cost for any clearance purchase. Below 20%, the margin is too thin to absorb price compression, slow sales, or fee changes. The strongest arbitrage buys produce 30–50% ROI. Items over 60% ROI warrant a Keepa check to confirm the price isn't a temporary spike.