"What should my ACoS be?" is one of the first questions Amazon sellers ask. Understandable, and it still leads people astray. The same ACoS can be an excellent result for one brand and a margin-eating problem for another. This article explains why there is no single "good" figure, which rough reference points still help, and how to calculate your own target properly.

Why blanket answers do not work

Picture two sellers. Both reach an ACoS of 35%. The first sells cosmetics at a 55% margin, so for him that is a healthy, profitable figure with room to spare. The second sells electronics accessories at a 25% margin, so for him the same ACoS means he loses money on every advertised sale. Same number, opposite meaning. That is why the question of a "good ACoS" is hard to answer without context.

Three factors decide your target: your margin, your objective (profit or growth) and the phase in the product lifecycle (launch, scaling, maturity).

Rough benchmarks by category, as a starting point

Industry averages vary widely but give a first orientation. In practice many accounts sit in these bands:

  • Low-priced consumables (drugstore, food): often 15 to 25%, because high repeat purchase rates justify the advertising pressure.
  • Hard goods at medium margin (home, kitchen): frequently 20 to 30%.
  • Fashion and accessories: 25 to 35%, with large swings depending on competition.
  • Electronics and accessories: often 15 to 25%, because margins are thin.
  • High-priced niche products: can carry 30% and more, when the absolute margin is high.

These numbers are not targets but a reality check: if you sit well outside the typical band for your category, it is worth a closer look.

The calculation that really counts: your break-even ACoS

Rather than orienting yourself on somebody else's averages, work out your own break-even point. It equals your profit margin before advertising costs.

Here is how:

  1. Note the selling price (say €40).
  2. Subtract every cost: cost of goods, the Amazon referral fee, the FBA shipping fee, packaging, the share lost to returns.
  3. What is left is your contribution margin. If €14 remains, that is 35% of the price.
  4. That percentage, here 35%, is your break-even ACoS.

Everything below it is advertised profitably, everything above costs you money per sale.

From break-even to a target

Break-even is the ceiling, not the goal. How far below it you aim depends on your intention:

  • Profit mode: a target clearly below break-even, for instance a target ACoS of 20 to 25% against a 35% break-even. You accept a little less volume and secure profit per unit.
  • Growth or launch mode: a target at or deliberately above break-even. You are buying visibility, ranking and first reviews, a calculated loss meant to pay for itself through organic revenue.
  • Defense mode: on contested brand keywords or bestsellers you sometimes accept a higher ACoS, so as not to lose placements to competitors.

The blind spot: ACoS alone is not enough

A low ACoS looks good and can mislead. If you cut the advertising pressure so far that your organic revenue collapses with it, you optimized on paper and lost in reality. That is why TACoS, the ratio of ad spend to total revenue, always belongs on the table too. A slightly rising ACoS alongside a falling TACoS is often a very good sign: the advertising is pulling organic revenue behind it.

In short

There is no universally "good" ACoS. Industry benchmarks work as a rough reality check, but your real target follows from your margin, your business objective and the phase the product is in. Calculate your break-even ACoS, derive a deliberate target from it, and always check it together with TACoS. Then you stop hunting for a wished-for number and start making decisions that fit your business.