What Is a Good ACOS on Amazon? (Real Benchmarks + How to Fix Yours)

Every Amazon seller eventually asks the same question: is my ACOS good, or am I burning money? The honest answer is that "good" depends on your margins and your goal — but there are real benchmarks, and there's a number you can calculate in two minutes that tells you exactly where your line is.

ACOS in plain terms

ACOS (Advertising Cost of Sales) is ad spend divided by ad revenue:

ACOS = Ad Spend ÷ Ad Sales × 100

Spend $250 on ads that produce $1,000 in sales, and your ACOS is 25%. Lower means more efficient. That's the whole formula — the hard part is knowing what number you should be aiming for.

The number that actually matters: break-even ACOS

Forget generic benchmarks for a second. Your break-even ACOS is your profit margin before ad spend:

Break-even ACOS = Profit per unit (before ads) ÷ Selling price × 100

Say you sell at $30, and after product cost, Amazon fees, and shipping you keep $9. Your break-even ACOS is 30%. Below 30%, ads make you money on the first order. Above it, every ad-attributed sale loses money.

Work this out per product, not per account. A 35% ACOS can be great on a 45%-margin product and a disaster on a 20%-margin one.

Typical ACOS benchmarks (so you have context)

Across categories, most established private-label sellers land somewhere in these ranges:

Two caveats. First, these are ranges, not targets — your break-even ACOS is the target. Second, a "high" ACOS is a strategy during launch: you're paying for ranking, reviews, and sales history. It only becomes a problem when the launch is over and the ACOS never comes down.

TACOS: the metric that keeps ACOS honest

ACOS only looks at ad-attributed sales. TACOS (Total ACOS) divides ad spend by total revenue, organic included:

TACOS = Ad Spend ÷ Total Sales × 100

A healthy account usually shows TACOS between 5–15%. Here's why the pairing matters: if your ACOS is rising but TACOS is stable or falling, your organic sales are growing and the ads are doing their job. If both are rising, you're becoming dependent on ads — that's the warning sign.

My ACOS is too high — what do I actually fix?

High ACOS is never one problem; it's a handful of specific leaks. All of them are visible in your Search Term Report — the report that shows the actual customer searches that triggered your ads. Here's where to look, in order of impact:

1. Search terms with clicks and zero orders

Sort your Search Term Report by spend, filter for zero orders. Terms with 10+ clicks and nothing to show for it are pure waste — negate them (negative exact) so they stop draining budget. On most accounts we see, this alone recovers 10–20% of ad spend.

2. Bids set above what the keyword earns

For every keyword, there's a bid where you're profitable and a bid where you're not. If a keyword converts at 8% with a $20 average order and 30% margin, you can afford roughly $0.48 per click — not the $1.10 you set during launch and forgot about. Recalculate bids from actual conversion data, not gut feel.

3. Broad match running unsupervised

Broad and phrase match are discovery tools. They find new search terms — some gold, mostly junk. If you never harvest the winners into exact match and never negate the junk, broad match quietly becomes your most expensive campaign.

4. Paying for keywords you already rank #1 for organically

If you're top-3 organic for a keyword, a high paid bid on that same keyword partly cannibalizes sales you'd get free. Check your organic rank before deciding a bid (a Helium 10 export next to your Search Term Report shows this instantly).

5. The listing, not the ads

If plenty of relevant clicks aren't converting anywhere, the problem is price, images, or reviews — not PPC. No bid change fixes a listing problem.

How often should you review ACOS?

Weekly checks, bi-weekly bid changes is the rhythm that works for most small and medium sellers. Amazon's attribution takes several days to settle, so reacting daily means reacting to incomplete data. And whenever you change bids, write down what you changed — next cycle, the only question that matters is did that move work?

FAQ

Is a lower ACOS always better?

No. The lowest possible ACOS usually means you're underbidding and leaving sales (and organic ranking) on the table. The goal is profitable, not minimal.

What's a good ACOS for a new product?

During launch, 50–100%+ can be rational — you're buying ranking and reviews. Set a deadline (e.g., 8–12 weeks) for it to trend toward your break-even number.

Why did my ACOS jump suddenly?

Usual suspects: a competitor raised bids or launched, your ad got moved by a bid change, seasonality, or a broad-match keyword started matching new junk terms. Compare this period's Search Term Report against the last one and the cause is usually obvious.

BidSpring turns your Search Term Report and Bulk file into exact bid, negation, and harvest recommendations — each with the numbers behind it, at a flat $19/month, without connecting your Amazon account. Start a free 14-day trial or read the step-by-step optimization guide.