Net profit, margin, ROI, and TACoS for an Amazon FBA listing — all factored in: COGS, fees, PPC, returns, inbound shipping. Real-time recalculation.
Most beginner sellers underestimate three lines on this P&L: refund processing cost, blended PPC per unit, and inbound shipping to FBA. Each looks small individually. Together they can flip a 22% paper margin into a 9% actual margin.
Refund processingis the cost of a return beyond the refunded revenue itself. Amazon takes a portion as a restock or returns fee, sometimes the unit comes back unsellable (lost), and there's the operational overhead of inspecting and re-listing. We use 20% of refunded revenue as a working approximation; track your actual cost per return for 3 months to dial in a per-SKU number.
Blended PPC per unit is total monthly ad spend (all campaigns, all match types) divided by total units sold (ad-attributed plus organic). This is the only PPC number that matters for profitability. ACoS at the campaign level is for campaign decisions; blended PPC per unit is for business decisions.
Inbound shippingper unit varies wildly: $0.30 for sea freight on large pallets, $1.50+ for air freight on small orders, $3+ if you're using Amazon Partnered Carrier on small batches. Calculate it from a real shipment to FBA, divided by units in the shipment.
Margin %: net profit divided by gross revenue. The single most important number on this page. Under 10% is fragile. 20-35% is the comfort zone for private-label brands.
ROI: net profit divided by COGS invested. ROI of 50%+ means you're doubling your money on each unit cycle. This drives how fast you can scale; high-ROI SKUs reinvest themselves faster.
TACoS: total ad spend divided by total revenue (including organic). The trajectory matters more than the level. A new launch will run high TACoS (25-40%) and should see it fall over 90-180 days as organic rank builds.