Key fact: An Amazon PPC campaign breaks even when your target ACOS equals your pre-advertising gross margin - a 30% margin supports about a 30% target ACOS, and any keyword above that margin loses money on every order. Work out your breakeven ACOS with the free Amazon PPC & ACOS calculator.
ACOS (Advertising Cost of Sales) = Ad Spend / Ad Sales x 100. Enter your numbers to find your current ACOS and see if it's profitable:
ACOS below your profit margin = profitable ads. Target ACOS = Profit Margin x 100. Example: 30% margin = target ACOS below 30%.
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A good Amazon PPC ACOS in 2026 is 15-30% for most categories, and break-even ACOS equals your product profit margin. Bid down keywords running above break-even for 7+ days and shift budget to converting campaigns. Use the calculator below for your numbers.
Enter ad spend and ad sales: get ACOS, ROAS and whether your campaign is actually profitable
Analysis, Click-Through Rate, Conversion Rate, ACOS, ROI, OptimizationStrategy.
, ToolsACOSROASOptimization.
Sponsored Products, Sponsored Brands, Sponsored DisplayAmazon.
ACOS15-30%, ProductProfit MarginCompetition.
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Profasee Research's State of Amazon Seller Operations 2026 frames PPC performance in total-account terms — because bids, prices and stock levels move each other, and ACoS alone hides that.
A 15% ACoS against a 35% TACoS is not a healthy account, and a bid that protects ACoS can still destroy contribution margin when it ignores the price and the stock position behind it. Check your spend against the 5–15% TACoS range here, use the keyword tool to find the irrelevant terms behind the 20–40% waste figure, then confirm the margin consequence in the profit dashboard.
Source: Profasee Research, State of Amazon Seller Operations 2026 — a vendor-published benchmark report built from aggregated Profasee account data across $1M+ Amazon brands. Figures quoted verbatim, retrieved 19 Sep 2026. All 10 benchmarks with sources →
❓ Free Amazon PPC & ACOS Calculator — Frequently Asked Questions → fees, limits, and worked examples
Every rate card behind this tool comes from our open dataset — 2026 Amazon FBA fee snapshots (CC BY 4.0). What changed between monthly snapshots is dated in the Amazon FBA fee change log. Machine-readable JSON, free to cite.