Amazon PPC ACoS Calculator

Enter your ad spend, ad sales and profit margin to see ACoS, break-even ACoS, ROAS and TACoS instantly — free, private and calculated entirely in your browser.

📖 How it works & FAQ

Ad spend ($)

Ad sales ($)

Profit margin before ads (%)

Total sales ($, optional — for TACoS)

What ACoS tells you (and the number that matters more)

ACoS — Advertising Cost of Sales — is the share of your ad-attributed revenue that goes straight back into ads: ad spend ÷ ad sales × 100. The number only matters next to your break-even ACoS, which is simply your profit margin before ad costs. If a product nets a 30% margin after product cost and Amazon fees, then 30% is the ACoS at which ads earn you exactly zero — every point below it is profit, every point above it is a loss on ad-attributed orders. ROAS is the same relationship flipped (ad sales ÷ ad spend), and TACoS divides ad spend by total sales, organic plus ads, to show how dependent a listing is on paid traffic. The default margin here is an approximate figure you can edit; check the platform's current fees and your own unit economics — results are estimates only, not financial advice.

How to use it

Copy ad spend and ad sales for a period from your Amazon Ads campaign report.
Enter your product profit margin — profit after Amazon referral and FBA fees but before ad costs, divided by selling price.
Optionally enter total sales (organic and ads together) to see TACoS.
Read the cards: if ACoS sits below break-even ACoS you are profitable, and the margin-after-ads card shows what is left of each ad-attributed dollar.

FAQ

What is a good ACoS?: There is no universal number — it depends on margin. Many sellers aim for 15–25%, but a 40% ACoS is fine on a 55%-margin product and disastrous on a 20%-margin one. Compare against your own break-even, not someone else's benchmark.
What is the difference between ACoS and TACoS?: ACoS counts only revenue Amazon attributes to your ads. TACoS uses total revenue, so it captures the organic halo effect. A steady ACoS with a falling TACoS usually means ads are lifting organic sales — a healthy sign.
How do I find my break-even ACoS?: Take your selling price, subtract product cost, the Amazon referral fee, FBA or shipping fees and any other per-unit costs, then divide the remaining profit by the price. That percentage is both your pre-ad margin and your break-even ACoS.
Is a high ACoS ever acceptable?: Yes. During a launch many sellers run at or above break-even on purpose to build rank, reviews and organic sales, then tighten bids later. Judge launch campaigns on the TACoS trend rather than ACoS alone.