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Key fact: ROI on Amazon is not revenue divided by selling price. It is the profit left after the referral fee, the fulfilment fee, monthly storage and advertising, measured against the capital you actually tied up in inventory — which is why two SKUs with the same margin can return very different amounts per dollar invested. The free ROI calculator works out return on capital and the payback period for each product, so budget goes to the SKU that earns it back fastest.
Calculate Return on Investment for Amazon FBA. Coming soon.
ROI = net profit ÷ total cash invested × 100. Total invested = COGS + inbound shipping + FBA fees + PPC for the units sold. Example: a $25 product with $17.50 total cost and $5 net profit per unit yields about 28.5% ROI.
Most sellers target 50–100% ROI on invested cost, which corresponds to a 15–25% net margin on price. Below 30% ROI a product cannot absorb fee increases or PPC spikes — the 3.5% fuel surcharge and $2.40 peak-season storage quickly erode thin returns.
Margin is profit as a share of revenue; ROI is profit as a share of money invested. A product can have a healthy 20% margin but weak ROI if COGS is high relative to price. Track both — margin shows pricing health, ROI shows capital efficiency for inventory decisions.
PPC comes straight out of profit before ROI is computed. On a $25 product with a $4.60 fulfillment fee, every $5 of ad spend per sale cuts roughly 20% of net profit. Most FBA products break even on advertising at a 15–25% ACOS, so anything above that erodes ROI.
The biggest ROI reducers are the 15% referral fee, fulfillment fees of $3.45–$9.35 plus the 3.5% fuel surcharge, storage ($0.78–$2.40 per cubic foot), return processing ($1.90–$5.00), and PPC. Aged inventory surcharges up to $6.90 per cubic foot are the most commonly missed ROI killer.
Yes — the ylishi.tools ROI Calculator is 100% free, no signup required. Enter price, costs, and fees to get instant ROI, margin, and break-even figures using the January 15, 2026 Amazon US rate card.
❓ Amazon ROI Calculator — Frequently Asked Questions → fees, limits, and worked examples