What Is Smart Bidding in Google Ads?

Google's own help page names exactly four: Target CPA, Target ROAS, Maximize conversions, and Maximize conversion value. Everything else in the bidding menu is either manual or not Smart Bidding.

Target CPA chases a cost per conversion you name. Target ROAS chases a return on ad spend you name. Maximize conversions chases the most conversions your budget can buy, whatever they cost. Maximize conversion value chases the biggest total revenue, whatever the return.

For an ecom store the split is simple. If you care about revenue per euro spent, you are in the ROAS pair. If you care about volume and you have the margin to absorb it, you are in the conversions pair. Picking the wrong pair is the most common bidding mistake there is, and it looks like a settings problem rather than a strategy one.

Google describes Smart Bidding as using "Google AI to optimize for conversions or conversion value in every auction, a feature known as 'auction-time bidding'". Read that literally. There is no single bid sitting on your keyword any more. There is a fresh bid, calculated for each individual search, at the moment it happens.

The signals Google names on that page are the reason it can do it. Device type: bids adjust based on "whether someone is on a mobile, desktop, or tablet device". Location, "down to the city". Time, "based on someone's local time of day and day of week in their time zone". On-site behaviour, including "number of pages viewed, value of products browsed". And the search itself, "based on the text of the query that triggered the ad".

That is a lot of context you could never price by hand, which is why manual bidding lost. It is also why Smart Bidding on a clean account with good conversion tracking usually beats a person, and costs nothing extra.

Your margin. Google knows what a conversion is worth in revenue, because your tracking tells it. It does not know what the product cost you, what your return rate is, or which SKU makes 60% and which makes 9%. So a Target ROAS of 4 treats a bestseller and a loss-leader as the same product at the same value.

That gap is where the work is, and the fix is old-fashioned. Feed profit into Google in a form it can bid on: tag products by margin, push those tags into Merchant Center custom labels, and set a different target per tier. Then a ROAS goal finally means something.

That is the job Scaley AI does. It watches the account 24/7 and tags every SKU by margin and velocity. Those tags sync into your Merchant Center custom labels daily, so a ROAS target can finally aim at profit. It writes nothing to your account until you approve it, and every proposal carries the reason it was raised. We build Scaley, so weigh that. The track record behind it belongs to ZenoX Media, our sister Google Ads agency, which generated €200M+ in revenue for 200+ ecom brands.

Where we are the wrong pick, honestly. On a small, tidy account with solid conversion tracking, Smart Bidding on Google's defaults is usually enough and it is free. If you want to build your own bidding rules and run them on a schedule, buy a rules workbench instead: Optmyzr's own pricing page lists "Rule Engine-Based Custom Optimizations and Insights" across its Essentials, Premium and Enterprise plans, with "Rule Engine Automations: Hourly* / Daily / Weekly / Monthly / Annually*" at the top tier. Scaley has no rule builder in it. We prepare the moves and wait for you to approve them, which is a different product.