Free Amazon Advertising Tool
Amazon TACoS Calculator
Enter your total sales and ad spend. Get your TACoS, ACoS, organic ratio, and an honest verdict on whether your ads are building a brand or buying every sale.
The TACoS Formula
TACoS (Total Advertising Cost of Sales) is your ad spend divided by your TOTAL Amazon revenue, paid plus organic. ACoS only tells you how efficient your ads are. TACoS tells you whether your business is becoming less dependent on ads over time, which is the number that actually matters.
TACoS = Ad Spend ÷ Total Sales × 100
| Stage | Healthy TACoS Range | What It Means |
|---|---|---|
| Launch (first 90 days) | 25–50% | Buying visibility and reviews. Expected, if it trends down. |
| Growth | 10–20% | Ads and organic compounding together. The healthy scaling zone. |
| Mature | Under 15% | Organic carries the business; ads defend and extend. |
The direction matters more than the number. A 20% TACoS trending down beats a 12% TACoS trending up. And the single biggest warning sign is TACoS sitting close to your ACoS: it means almost no organic sales exist, so you are buying every sale. That is a traffic-quality problem, not a bidding problem.
For the full breakdown of TACoS benchmarks by category, why it beats ACoS as a north-star metric, and how to bring it down without killing growth, read our guide: Amazon TACoS: formula, meaning, and benchmarks.
Why TACoS Beats ACoS as Your North Star
ACoS grades a campaign. TACoS grades the business. When ads drive ranking, the sales they create show up as organic revenue that ACoS never sees. Optimizing ACoS alone leads brands to cut the exact spend that was feeding their organic flywheel, then watch total revenue sag 60 days later.
The pattern we push accounts toward: TACoS falls while total sales rise. That combination means organic rank is compounding under the ads. When TACoS climbs while sales stay flat, ads are propping up a listing or traffic problem that bids cannot fix.
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