Google Ads Auto Bidding Exposed: When to Use It & How to Avoid Costly Mistakes

April 10, 2025 - by Lior Krolewicz, Founder and CEO,Yael Consulting

Google Ads Auto Bidding Exposed: When to Use It & How to Avoid Costly Mistakes 

Many business owners are using Google’s automatic bidding options in their campaigns. These options, such as “Maximize Conversions” and “Maximize Value,” or even targeting specific goals like Target CPA (Cost per Acquisition) or ROAS (Return on Ad Spend), sound appealing. On the surface, it seems like a smart way to let Google handle bidding while you focus on other aspects of your business. 

However, while automatic bidding might appear to be magic in theory, there are some key points you need to understand before you jump in. In this tutorial, we will walk you through when to use automatic bidding and, more importantly, how to avoid the mistakes that can lead to wasted budget. 

Understanding Google Ads Automatic Bidding 

Google Ads provides a variety of automated bidding strategies designed to help advertisers achieve specific goals. These strategies adjust bids in real-time based on various signals such as the user’s location, device, time of day, and more. 

  • Maximize Conversions: Google will automatically set bids to get the most conversions possible within your budget. 
  • Maximize Conversion Value: This strategy focuses on maximizing the total value of your conversions, which is ideal if you’re selling high-ticket items or want to optimize for revenue rather than just leads. 
  • Target CPA (Cost per Acquisition): Google sets bids to help you achieve a specific cost per acquisition. This can be great for controlling the cost of each lead or sale. 
  • Target ROAS (Return on Ad Spend): This strategy tries to achieve a certain return on ad spend by automatically adjusting bids to maximize revenue. 

These strategies are particularly helpful for businesses looking to scale quickly, but the key to success lies in understanding the data behind them. 

When to Use Automatic Bidding 

Automatic bidding works best when you have sufficient historical data. Google’s algorithms need data to adjust bids effectively. Without this, you might run into issues. Here’s when automatic bidding could be beneficial: 

  1. You have enough conversion data: For example, if you’ve been running your campaigns for a while and have enough conversions (Google generally recommends at least 30 conversions in the past 30 days for Target CPA or ROAS strategies), the system will have the data it needs to make informed decisions. 
  2. You’re looking for efficiency: If your business goals are clearly defined and you want to achieve them with minimal manual effort, automatic bidding can help.
  3. You want to focus on other aspects of your campaigns: Letting Google handle the bidding while you focus on optimizing your creatives, targeting, or messaging can free up your time for other important tasks. 

When to Avoid Automatic Bidding 

While automatic bidding can save time and help optimize for conversions, there are scenarios where it can lead to overspending or inefficiency. Here’s when to avoid it: 

  1. You have a new account with no data: If you’re just starting out and don’t have much data yet, Google won’t have the insights it needs to make good bidding decisions. Without enough historical data, automatic bidding can result in unpredictable costs and performance. 
  2. Your account lacks conversion tracking: For automatic bidding to work effectively, it needs to track conversions properly. If your conversion tracking is misconfigured or not set up at all, you could end up wasting your budget on poor-performing keywords or ads. 
  3. You don’t have a clear goal or a budget: If you don’t have a well-defined target cost-per-conversion or return on ad spend goal, Google will have trouble optimizing for what you want. You might end up spending too much without hitting your objectives. 

Best Practices to Avoid Costly Mistakes 

To make the most out of automatic bidding and avoid costly mistakes, consider the following best practices: 

  • Start with manual bidding until you have enough data: If you’re just starting, begin with manual bidding or a more controlled approach until your account gathers sufficient data. Once you have enough conversions, switch to automatic bidding. 
  • Set clear, measurable goals: Before enabling automatic bidding, make sure you have clear, measurable goals, such as a specific CPA or ROAS target. This ensures Google can optimize in a way that aligns with your business objectives. 
  • Monitor performance closely: Even with automatic bidding, it’s crucial to monitor your campaigns closely. Make sure your conversions are being tracked correctly, and adjust your budget and targets based on performance. 
  • Be patient: Automatic bidding strategies often require time to gather enough data to perform effectively. Don’t expect immediate results, and be prepared to make adjustments after a few weeks of testing. 
  • Use Google’s tools and insights: Google provides valuable performance insights and recommendations. Use them to inform your decisions and optimize your campaigns over time. 

Conclusion 

While automatic bidding in Google Ads can be a powerful tool to help you scale your campaigns, it’s not a one-size-fits-all solution. Understanding when to use it and how to avoid mistakes is crucial to making the most out of your ad budget. With the right setup and enough data, automated bidding strategies can work wonders. But, always make sure you’re aligning it with your business goals and monitoring performance to avoid costly mistakes. 


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