High ad cost share (ACOS) on Ozon is not a verdict, it is a signal to act. Sellers with ACOS of 57% and even 100% are common. Here is why advertising gets expensive and how to bring it back to normal.
What ACOS is and what normal looks like
ACOS is the share of ad spend in the revenue those ads generate. The formula is simple: ad spend divided by ad revenue, multiplied by 100.
What counts as normal:
- Launch phase: 30-50% is acceptable while you are pushing a new product.
- Steady sales: up to 10-15% once the product is dialled in and selling at a stable level.
- Problem zone: ACOS above 40-50% for a long stretch.
When high ACOS is justified
A high figure usually means something is off: a weak metric, a poorly used tool, a seasonal dip. But sometimes it is fine, for example when you are promoting a new product.
If ACOS does not come down over time, something is genuinely wrong. Below are the six most common mistakes and the concrete steps that cut ad costs without cutting sales volume.
Mistake 1: too few reviews
The most frequent mistake is a low number of reviews. The fewer reviews on a product card, the lower its conversion, as a rule. Lower conversion means fewer sales and a higher ACOS. Advertising gets more expensive in direct proportion to how few reviews the card has.
Recommendation: at least 10 reviews before you switch on ads. That is the bare minimum.
Mistake 2: no analytics and no bid control
Many sellers launch ads and never analyse performance: they do not look at the numbers at all. The fix is to review every product individually: sales volume, cost per click, conversion, ACOS and so on. Not the campaign as a whole, but each product.
A common pattern: one group of products eats the entire ad budget and drags the average ACOS down, while another group that could perform much better is starved of traffic. Watch the analytics closely.
Mistake 3: inflated bids
Sellers enter advertising with high bids close to the competitive level, then are surprised that ads are expensive, ACOS is high and they barely earn anything.
The fix: always start campaigns at minimum bids. Do not overpay from the start. Begin low and raise bids gradually.
Mistake 4: a weak product card
If a product has low CTR or low conversion, you are simply giving money away.
Benchmarks to compare against:
- CTR below 1%: bad. The photo, title or infographics are not attracting attention.
- CTR of 1-2%: better, but still room to improve.
- Conversion below 5%: weak description, too few reviews or an inflated price.
In other words, there is a packaging error somewhere. A CTR under 1% means people are not clicking, and the ads will not work.
Mistake 5: competitors outbidding you
In aggressive niches such as electronics, competitors can simply bury you with bids. Ozon runs an auction, and the highest payer wins.
What to do:
- Check where your competitors advertise and through which tools.
- If they use pay per click, try pay per order. If they use pay per order, try search promotion.
- Find a bid level that still delivers clicks. If the bid is too high, switch to alternative tools such as search promotion.
Mistake 6: irrelevant keywords
A product card is promoted on the keywords you add to it. Split them into three groups:
- Broad queries ("backpacks", "watches", "slippers"): many clicks, low conversion.
- Mid-frequency keywords ("city backpack", "waterproof watch", "home slippers"): the best balance of cost, conversion and traffic volume.
- Narrow intent queries ("men's city backpack"): fewer clicks, very high conversion.
Advice: switch off overly generic words and test more specific ones. Competition on Ozon is such that promoting on broad keywords is hard, expensive and largely ineffective.
Step 1: stop the budget leak
If ACOS is already high, first stop the money leak. Switch off unprofitable products, unprofitable keywords and unprofitable campaigns. Then review the keywords on your product cards: remove generic and junk keywords. And always switch off campaigns where ACOS is high.
Step 2: improve the card and reviews
Update the photos and the cover: the main image must stand out among competitors and provoke a click on you. Improve the title and description, and use more relevant keywords that match your product precisely.
Reviews also drive conversion. The more reviews, the higher the conversion. Even a simple tool such as reviews for points helps: people leave reviews more actively, and conversion and sales grow with them.
Step 3: adjust bids and strategies
Use manual bid management where it is still available. In our tests, automated campaigns can spend more than necessary, effectively inflating costs. Test different ad formats: sometimes pay per click is cheaper than pay per order, and sometimes a format surprises you. Check every tool and find the one that gives your store the lowest ACOS.
Step 4: track ad payback
Run a campaign for, say, 7 days. Then review bids, conversion and ACOS, analyse, and keep only the campaigns with the lowest ACOS.
A working campaign with minimal ACOS is one where the product brings in at least 1.5 times the spend. If ACOS on a product is higher than that, switch it off.
Launching a product without losses
The principle is a cautious start. For a new product, do not pour a lot of money into ads at once.
The first goal is not sales but data: CTR, conversion, margin. Set a test budget of about $50-85, see how the launch performs and which campaigns deliver the best result.
If the first 1,000-2,000 impressions give a CTR below 1% and a conversion below 5%, that is an early warning sign. There is no point in pushing such a product further. Fixing the product card is usually cheaper than spending on loss-making ads with sky-high ACOS, low clickability and low conversion. Work on the cards first.
Bottom line
Ozon advertising can grow sales, but used badly it eats your margin. Treat it as an amplifier for the business, not as a cost line with no return.
