What is Smart Bidding in Google Ads?

A bid is the most you will pay for a click or an action. With manual bidding, a person sets it. With Smart Bidding, Google sets it at auction time, using many signals such as device, location and time of day¹.

The strategies in this family include Target CPA, Target ROAS, and strategies that maximise conversions or conversion value¹. Google's documentation says Smart Bidding needs conversion tracking¹. Without it, there is nothing to optimise for.

The strategies themselves are explained on their own pages: Target ROAS and Target CPA. Both are types of bid strategy. "Automated bidding" is the broader category. Google describes Smart Bidding as one type of automated bidding, applied to conversions and conversion value¹.

When a strategy bids for conversion value (Target ROAS, or the strategy that maximises conversion value), people often call it value-based bidding. The system chases whatever number you tell it counts. If the number is wrong, it gets very good at the wrong thing.

So the useful question is not "is Smart Bidding on?". It is "which values is it optimising for, and do they include margin or returns?"

Our view: the reported value is the target. Report revenue, and you get revenue. For giving the bidder profit and returns signals, read about profit-based bidding in Google Ads.

Data quality also matters at the other end. Better conversion matching, such as enhanced conversions, gives the system more to learn from.

Performance Max is a campaign type, not a bid strategy. It reaches all of Google's inventory from one campaign, with Google's AI managing bids, budget and placements. The same rule applies: it works from the conversions and values you give it.

For how bidding fits a margin-first view of channels, see paid media strategy for ecommerce.