Bidding strategies in Google Ads have evolved significantly. The days of constantly adjusting keyword bids manually are largely behind us. Today, Smart Bidding offers a more intelligent and automated way to get results, powered by real-time data and machine learning.
In this post, we’ll look at what Smart Bidding is, how it works, the main strategies available, and how to get the best results from it.
What Is Smart Bidding?
Smart Bidding is a group of automated bid strategies in Google Ads that use machine learning to optimise for conversions or conversion value. This happens at the time of each auction, which is known as auction-time bidding.
Instead of applying the same bid across the board, Google evaluates real-time signals such as device, location, time of day, audience, and browser. It then adjusts bids based on the likelihood of a conversion.
The Main Smart Bidding Strategies
Here are the key options and when to use them:
1. Target CPA (Cost Per Acquisition)
You set a target cost per conversion, and Google aims to deliver as many conversions as possible at or below that cost.
Best for: Lead generation or campaigns with a clear cost per lead or sale.
2. Target ROAS (Return on Ad Spend)
You provide a target return on ad spend, and Google works to maximise the value of conversions while meeting that goal.
Best for: E-commerce and campaigns where revenue is the priority.
3. Maximise Conversions
This strategy uses your budget to generate the highest possible number of conversions without focusing on individual conversion costs.
Best for: When you want to get the most out of a limited budget or don’t yet have enough data for Target CPA.
4. Maximise Conversion Value
Similar to Maximise Conversions, but the focus is on driving the most valuable conversions rather than the highest number.
Best for: Campaigns where some conversions are more valuable than others.
Note on Enhanced CPC
Enhanced CPC (eCPC) was once a popular bidding option for advertisers who wanted to retain manual control while letting Google adjust bids in real time. However, Google is now phasing it out in favour of fully automated Smart Bidding strategies. While it may still appear in some accounts, it’s no longer recommended for most new campaigns and is not supported in newer campaign types like Performance Max.
How It Works: Understanding Auction-Time Bidding
Smart Bidding stands out for its use of auction-time signals. For each ad opportunity, Google looks at a wide range of contextual data to predict the chances of a conversion. Based on that prediction, it increases or decreases the bid in real time.
Over time, as more data is gathered, the system learns and becomes more effective. Results often improve after the initial learning period, so consistency is important.
The Benefits of Smart Bidding
- It uses real-time data to make smarter decisions.
- You’ll spend less time manually managing bids.
- Bids are optimised at the exact moment of each auction.
- It works well across large accounts with many campaigns or keywords.
- It integrates seamlessly with automation-first campaigns like Performance Max.
Common Pitfalls to Avoid
Smart Bidding is powerful, but it’s not foolproof. Here are a few common mistakes:
- Insufficient data: Some strategies require a minimum number of conversions to perform effectively.
- Frequent changes: Major edits to budgets, landing pages, or goals can reset the learning phase.
- Poor conversion tracking: If you’re not tracking meaningful actions, the system won’t optimise correctly.
- Weak account structure: Smart Bidding performs best when campaigns are well organised and clearly focused.
Tips for Success
- Give the algorithm time to learn. Most strategies need at least one to two weeks to stabilise.
- Use conversion values where possible, especially for Target ROAS or Maximise Conversion Value.
- Combine with broad match keywords if you want to expand reach, but monitor performance closely.
- Implement Enhanced Conversions or import offline conversions to improve data accuracy.
- Set realistic initial targets based on historical performance, and adjust gradually as needed.
When Manual Bidding Still Makes Sense
There are situations where manual bidding may still be a better fit:
- Campaigns with low conversion volumes.
- New campaigns where you want full control from the start.
- Accounts with tight budgets that require careful cost control.
- Niche industries where Google’s predictions may not have enough context.
Final Thoughts
Smart Bidding can be one of the most effective tools in your Google Ads strategy. It saves time, scales easily, and can drive strong results when used correctly. But it still relies on a solid foundation. Clear goals, accurate tracking, and a strong campaign structure are essential.
Automation works best when guided by a thoughtful strategy. If you give Smart Bidding the right conditions to learn and optimise, it can significantly improve your advertising performance.
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