How to Lower Your ACoS Without Losing Sales
Anyone can slash their ACoS overnight — just turn off the ads. The hard part is lowering it while keeping the sales flowing. That means attacking waste and improving conversion rather than simply spending less. Here are the levers that reduce your ACoS without gutting your volume.
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Understand what drives ACoS
ACoS is really a story about two numbers: how much you pay per click and how often those clicks convert. Lower the cost per click or raise the conversion rate and ACoS falls automatically. Every tactic below pulls one of those two threads — which is why they cut cost without cutting sales.
You don't lower ACoS by spending less. You lower it by wasting less and converting more.
1. Cut the obvious waste with negatives
The fastest win is eliminating spend on searches that never convert. Comb your search-term report for terms with clicks and no sales, then add the clearly irrelevant ones as negative keywords. This removes cost without touching a single profitable click — pure ACoS reduction with zero sales impact.
2. Tune bids toward performance
Blanket-high bids inflate your cost per click on keywords that don't deserve it. Go keyword by keyword: trim bids on terms running over your target ACoS and hold or raise bids on the efficient ones. The aim is to pay in proportion to how well each keyword converts, not to slash everything.
| Lever | What it changes | Effect on sales |
|---|---|---|
| Add negatives | Removes wasted clicks | None — sales held |
| Trim losing bids | Lowers cost per click | Minimal if targeted well |
| Improve listing | Raises conversion rate | Sales rise |
| Turn ads off | Removes all spend | Sales fall — avoid |
3. Fix conversion, not just clicks
This is the lever most sellers ignore. If two shoppers click and only one buys, doubling your conversion rate halves your ACoS with no change to spend. Sharpen your main image, lead your bullets with benefits, add strong secondary images or infographics, and make sure your price is competitive. Use Scribbles or Frankenstein to weave your best keywords naturally into the listing so the traffic you pay for is relevant in the first place.
Quick tip
Before blaming your bids, check your conversion rate against category norms. A listing that converts poorly makes every campaign look expensive — fixing the page lifts every keyword at once.
The listing levers that move conversion most
Since conversion rate is the highest-leverage number in your ACoS, it's worth knowing which parts of a listing move it most. In rough order of impact:
- Main image: the single biggest driver of click-through and a major factor in conversion. A crisp, well-lit hero image that clearly shows the product beats a mediocre one every time.
- Price and offer: if you're priced well above comparable listings without a clear reason, no amount of bid tuning fixes the conversion gap.
- Reviews and rating: social proof reassures buyers. More and better reviews lift conversion across every keyword at once.
- Bullets and A+ content: benefit-led copy and rich imagery answer objections before they cost you the sale.
Improving any of these raises conversion for both paid and organic traffic, so the payoff extends well beyond your ad account.
Avoid the false economy of turning ads off
When ACoS spikes, the instinct is to pause the "expensive" keywords or slash budgets across the board. Sometimes that's right — but often those keywords are also supporting your organic rank and total sales. Cutting them can drop your rank, which reduces organic sales, which quietly raises your TACoS even as your ACoS looks better on paper. Always weigh a cut against its likely effect on total sales, not just on the ad line item.
4. Concentrate spend where it works
Use placement and match-type data to shift budget toward the slots and keywords that convert best. Promoting proven terms into exact-match campaigns and applying placement multipliers to high-converting spots pushes money toward efficiency instead of spreading it thin.
5. Let organic rank do the heavy lifting
As your keywords climb the organic rankings, you can lean less on paid placements for the same total sales — which lowers ACoS and TACoS together. Track your keyword ranks over time so you know when a term is strong enough organically to ease off the bids.
Doing it at scale
Applying all this across a full account by hand is a slog. Helium 10's Adtomic automates the negative mining and bid tuning against your target ACoS, while Keyword Tracker shows which terms are ranking organically so you know where you can safely pull back paid spend. Together they let you lower ACoS methodically instead of with a blunt instrument.
The bottom line
Lowering ACoS the right way is about precision, not austerity. Cut waste, tune bids toward what converts, and above all improve your listing's conversion rate — then let growing organic rank compound the gains. Do that and your ACoS falls while your sales hold or climb.
Ready to put this into action?
Helium 10 gives you the tools in this guide in one dashboard. Start free through our link.