There is no universal good ACoS. Anyone who gives you one number without asking about your margin is guessing. A good ACoS is one that fits your profit goal for that product, at that stage. Here is how to work it out.
Start with break-even ACoS
Your break-even ACoS is the point where an ad sale makes no profit and no loss. It is roughly equal to your gross margin after product cost, Amazon fees and shipping.
Then set a target ACoS by goal
- New launch: a higher target, sometimes at or above break-even, is fine. You are buying rank and reviews, and accepting thin or no ad profit short term.
- Growth: target somewhere below break-even so each ad sale is profitable while you scale volume.
- Mature or defend: a lower target to protect margin, with a steady eye on TACoS.
Typical ranges (use as a sanity check, not a rule)
Across many categories, blended ACoS commonly lands between 15 and 35 percent. Branded keywords often run far lower, sometimes under 10 percent, while competitor and broad discovery terms run higher. If your blended ACoS sits near or above your break-even, that is the signal to audit.
Do not judge ACoS in isolation
Two more numbers give ACoS its meaning:
- TACoS: ad spend over total sales. A falling TACoS means ads are lifting organic sales, which is the long-game win.
- Conversion rate: if your listing converts poorly, no bid will fix the ACoS. Sometimes the listing, price or images are the real lever.
Quick reference
- Break-even ACoS equals your gross margin.
- Profitable when ACoS is below break-even.
- Launches can run higher on purpose, mature products run lower.
- Watch TACoS to see if ads are building organic.
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