In Google Ads, a campaign is defined as a set of ad groups that share a common business objective, such as target audience, location, and budget. The campaign is assigned several conversion goals which indicate if the objectives of the campaign are met. Campaign Cost per Goal Conversion indicates the costs associated with the campaign, known as campaign spend, that leads to each goal conversion.

This metric is a useful indicator of how effectively campaign investment converts to goals being met. Lower Campaign Cost per Goal Conversion can indicate that the campaign is effective in converting leads. It might also indicate that not enough money is being spent on the campaign.